//
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// HQFlowView.m
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// HQCardFlowView
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//
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// Created by Mr_Han on 2018/7/24.
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// Copyright © 2018年 Mr_Han. All rights reserved.
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// CSDN <https://blog.csdn.net/u010960265>
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// GitHub <https://github.com/HanQiGod>
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//
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#import "HQFlowView.h"
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@interface HQFlowView ()
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@property (nonatomic, assign, readwrite) NSInteger currentPageIndex;
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/**
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* 计时器用到的页数
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*/
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@property (nonatomic, assign) NSInteger page;
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/**
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* 一页的尺寸
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*/
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@property (nonatomic,assign) CGSize pageSize;
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@end
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//子控制器的类名
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static NSString *subviewClassName;
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@implementation HQFlowView
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark -
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#pragma mark Private Methods
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- (void)initialize {
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self.clipsToBounds = YES;
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self.needsReload = YES;
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self.pageCount = 0;
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self.isOpenAutoScroll = YES;
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self.isCarousel = YES;
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self.leftRightMargin = 0;
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self.topBottomMargin = 0;
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_currentPageIndex = 0;
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_minimumPageAlpha = 1.0;
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_autoTime = 5.0;
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self.visibleRange = NSMakeRange(0, 0);
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self.reusableCells = [[NSMutableArray alloc] initWithCapacity:0];
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self.cells = [[NSMutableArray alloc] initWithCapacity:0];
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self.scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
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self.scrollView.scrollsToTop = NO;
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self.scrollView.delegate = self;
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self.scrollView.pagingEnabled = YES;
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self.scrollView.clipsToBounds = NO;
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self.scrollView.showsHorizontalScrollIndicator = NO;
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self.scrollView.showsVerticalScrollIndicator = NO;
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subviewClassName = @"HQIndexBannerSubview";
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[self addSubview:self.scrollView];
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}
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- (void)setLeftRightMargin:(CGFloat)leftRightMargin {
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_leftRightMargin = leftRightMargin * 0.5;
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}
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- (void)setTopBottomMargin:(CGFloat)topBottomMargin {
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_topBottomMargin = topBottomMargin * 0.5;
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}
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- (void)startTimer {
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if (self.orginPageCount > 1 && self.isOpenAutoScroll && self.isCarousel) {
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NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:self.autoTime target:self selector:@selector(autoNextPage) userInfo:nil repeats:YES];
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self.timer = timer;
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[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
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}
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}
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- (void)stopTimer {
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if (self.timer) {
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[self.timer invalidate];
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self.timer = nil;
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}
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}
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- (void)adjustCenterSubview {
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if (self.isOpenAutoScroll && self.orginPageCount > 0) {
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[_scrollView setContentOffset:CGPointMake(_pageSize.width * self.page, 0) animated:NO];
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}
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}
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#pragma mark --自动轮播
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- (void)autoNextPage {
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self.page ++;
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:{
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[_scrollView setContentOffset:CGPointMake(self.page * _pageSize.width, 0) animated:YES];
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break;
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}
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case HQFlowViewOrientationVertical:{
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[_scrollView setContentOffset:CGPointMake(0, self.page * _pageSize.height) animated:YES];
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break;
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}
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default:
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break;
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}
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}
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- (void)queueReusableCell:(HQIndexBannerSubview *)cell{
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[_reusableCells addObject:cell];
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}
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- (void)removeCellAtIndex:(NSInteger)index{
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HQIndexBannerSubview *cell = [_cells objectAtIndex:index];
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if ((NSObject *)cell == [NSNull null]) {
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return;
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}
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[self queueReusableCell:cell];
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if (cell.superview) {
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[cell removeFromSuperview];
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}
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[_cells replaceObjectAtIndex:index withObject:[NSNull null]];
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}
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- (void)refreshVisibleCellAppearance{
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if (_minimumPageAlpha == 1.0 && self.leftRightMargin == 0 && self.topBottomMargin == 0) {
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return;//无需更新
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}
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:{
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CGFloat offset = _scrollView.contentOffset.x;
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for (NSInteger i = self.visibleRange.location; i < self.visibleRange.location + _visibleRange.length; i++) {
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HQIndexBannerSubview *cell = [_cells objectAtIndex:i];
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subviewClassName = NSStringFromClass([cell class]);
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CGFloat origin = cell.frame.origin.x;
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CGFloat delta = fabs(origin - offset);
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CGRect originCellFrame = CGRectMake(_pageSize.width * i, 0, _pageSize.width, _pageSize.height);//如果没有缩小效果的情况下的本该的Frame
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if (delta < _pageSize.width) {
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cell.coverView.alpha = (delta / _pageSize.width) * _minimumPageAlpha;
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CGFloat leftRightInset = self.leftRightMargin * delta / _pageSize.width;
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CGFloat topBottomInset = self.topBottomMargin * delta / _pageSize.width;
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cell.layer.transform = CATransform3DMakeScale((_pageSize.width-leftRightInset*2)/_pageSize.width,(_pageSize.height-topBottomInset*2)/_pageSize.height, 1.0);
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cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(topBottomInset, leftRightInset, topBottomInset, leftRightInset));
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} else {
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cell.coverView.alpha = _minimumPageAlpha;
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cell.layer.transform = CATransform3DMakeScale((_pageSize.width-self.leftRightMargin*2)/_pageSize.width,(_pageSize.height-self.topBottomMargin*2)/_pageSize.height, 1.0);
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cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(self.topBottomMargin, self.leftRightMargin, self.topBottomMargin, self.leftRightMargin));
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}
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}
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break;
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}
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case HQFlowViewOrientationVertical:{
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CGFloat offset = _scrollView.contentOffset.y;
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for (NSInteger i = self.visibleRange.location; i < self.visibleRange.location + _visibleRange.length; i++) {
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HQIndexBannerSubview *cell = [_cells objectAtIndex:i];
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subviewClassName = NSStringFromClass([cell class]);
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CGFloat origin = cell.frame.origin.y;
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CGFloat delta = fabs(origin - offset);
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CGRect originCellFrame = CGRectMake(0, _pageSize.height * i, _pageSize.width, _pageSize.height);//如果没有缩小效果的情况下的本该的Frame
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if (delta < _pageSize.height) {
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cell.coverView.alpha = (delta / _pageSize.height) * _minimumPageAlpha;
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CGFloat leftRightInset = self.leftRightMargin * delta / _pageSize.height;
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CGFloat topBottomInset = self.topBottomMargin * delta / _pageSize.height;
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cell.layer.transform = CATransform3DMakeScale((_pageSize.width-leftRightInset*2)/_pageSize.width,(_pageSize.height-topBottomInset*2) / _pageSize.height, 1.0);
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cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(topBottomInset, leftRightInset, topBottomInset, leftRightInset));
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cell.mainImageView.frame = cell.bounds;
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} else {
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cell.coverView.alpha = _minimumPageAlpha;
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cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(self.topBottomMargin, self.leftRightMargin, self.topBottomMargin, self.leftRightMargin));
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cell.mainImageView.frame = cell.bounds;
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}
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}
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}
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default:
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break;
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}
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}
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- (void)setPageAtIndex:(NSInteger)pageIndex{
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NSParameterAssert(pageIndex >= 0 && pageIndex < [_cells count]);
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HQIndexBannerSubview *cell = [_cells objectAtIndex:pageIndex];
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if ((NSObject *)cell == [NSNull null]) {
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cell = [_dataSource flowView:self cellForPageAtIndex:pageIndex % self.orginPageCount];
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NSAssert(cell!=nil, @"datasource must not return nil");
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[_cells replaceObjectAtIndex:pageIndex withObject:cell];
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cell.tag = pageIndex % self.orginPageCount;
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[cell setSubviewsWithSuperViewBounds:CGRectMake(0, 0, _pageSize.width, _pageSize.height)];
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__weak __typeof(self) weakSelf = self;
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cell.didSelectCellBlock = ^(NSInteger tag, HQIndexBannerSubview *cell) {
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[weakSelf singleCellTapAction:tag withCell:cell];
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};
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:
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cell.frame = CGRectMake(_pageSize.width * pageIndex, 0, _pageSize.width, _pageSize.height);
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break;
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case HQFlowViewOrientationVertical:
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cell.frame = CGRectMake(0, _pageSize.height * pageIndex, _pageSize.width, _pageSize.height);
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break;
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default:
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break;
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}
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if (!cell.superview) {
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[_scrollView addSubview:cell];
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}
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}
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}
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- (void)setPagesAtContentOffset:(CGPoint)offset{
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//计算_visibleRange
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CGPoint startPoint = CGPointMake(offset.x - _scrollView.frame.origin.x, offset.y - _scrollView.frame.origin.y);
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CGPoint endPoint = CGPointMake(startPoint.x + self.bounds.size.width, startPoint.y + self.bounds.size.height);
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:{
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NSInteger startIndex = 0;
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for (int i =0; i < [_cells count]; i++) {
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if (_pageSize.width * (i +1) > startPoint.x) {
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startIndex = i;
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break;
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}
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}
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NSInteger endIndex = startIndex;
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for (NSInteger i = startIndex; i < [_cells count]; i++) {
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//如果都不超过则取最后一个
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if ((_pageSize.width * (i + 1) < endPoint.x && _pageSize.width * (i + 2) >= endPoint.x) || i+ 2 == [_cells count]) {
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endIndex = i + 1;//i+2 是以个数，所以其index需要减去1
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break;
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}
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}
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//可见页分别向前向后扩展一个，提高效率
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startIndex = MAX(startIndex - 1, 0);
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endIndex = MIN(endIndex + 1, [_cells count] - 1);
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// self.visibleRange.location = startIndex;
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// self.visibleRange.length = endIndex - startIndex + 1;
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self.visibleRange = NSMakeRange(startIndex, endIndex - startIndex + 1);
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for (NSInteger i = startIndex; i <= endIndex; i++) {
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[self setPageAtIndex:i];
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}
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for (int i = 0; i < startIndex; i ++) {
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[self removeCellAtIndex:i];
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}
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for (NSInteger i = endIndex + 1; i < [_cells count]; i ++) {
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[self removeCellAtIndex:i];
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}
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break;
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}
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case HQFlowViewOrientationVertical:{
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NSInteger startIndex = 0;
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for (int i =0; i < [_cells count]; i++) {
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if (_pageSize.height * (i +1) > startPoint.y) {
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startIndex = i;
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break;
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}
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}
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NSInteger endIndex = startIndex;
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for (NSInteger i = startIndex; i < [_cells count]; i++) {
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//如果都不超过则取最后一个
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if ((_pageSize.height * (i + 1) < endPoint.y && _pageSize.height * (i + 2) >= endPoint.y) || i+ 2 == [_cells count]) {
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endIndex = i + 1;//i+2 是以个数，所以其index需要减去1
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break;
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}
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}
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//可见页分别向前向后扩展一个，提高效率
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startIndex = MAX(startIndex - 1, 0);
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endIndex = MIN(endIndex + 1, [_cells count] - 1);
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_visibleRange.location = startIndex;
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_visibleRange.length = endIndex - startIndex + 1;
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for (NSInteger i = startIndex; i <= endIndex; i++) {
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[self setPageAtIndex:i];
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}
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for (NSInteger i = 0; i < startIndex; i ++) {
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[self removeCellAtIndex:i];
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}
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for (NSInteger i = endIndex + 1; i < [_cells count]; i ++) {
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[self removeCellAtIndex:i];
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}
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break;
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}
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default:
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break;
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark -
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#pragma mark Override Methods
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- (id)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self)
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{
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[self initialize];
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}
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return self;
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}
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- (id)initWithCoder:(NSCoder *)aDecoder
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{
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self = [super initWithCoder:aDecoder];
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if (self)
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{
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[self initialize];
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}
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return self;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark -
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#pragma mark JQFlowView API
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- (void)reloadData {
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_needsReload = YES;
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//移除所有self.scrollView的子控件
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for (UIView *view in self.scrollView.subviews) {
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if ([NSStringFromClass(view.class) isEqualToString:subviewClassName] || [view isKindOfClass:[HQIndexBannerSubview class]]) {
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[view removeFromSuperview];
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}
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}
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[self stopTimer];
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if (_needsReload) {
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//如果需要重新加载数据，则需要清空相关数据全部重新加载
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//重置pageCount
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if (_dataSource && [_dataSource respondsToSelector:@selector(numberOfPagesInFlowView:)]) {
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//原始页数
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self.orginPageCount = [_dataSource numberOfPagesInFlowView:self];
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//总页数
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if (self.isCarousel) {
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_pageCount = self.orginPageCount == 1 ? 1: [_dataSource numberOfPagesInFlowView:self] * 3;
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}else {
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_pageCount = self.orginPageCount == 1 ? 1: [_dataSource numberOfPagesInFlowView:self];
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}
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//如果总页数为0，return
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if (_pageCount == 0) {
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return;
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}
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if (self.pageControl && [self.pageControl respondsToSelector:@selector(setNumberOfPages:)]) {
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[self.pageControl setNumberOfPages:self.orginPageCount];
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}
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}
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//重置pageWidth
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_pageSize = CGSizeMake(self.bounds.size.width - 4 * self.leftRightMargin,(self.bounds.size.width - 4 * self.leftRightMargin) * 9 /16);
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if (self.delegate && self.delegate && [self.delegate respondsToSelector:@selector(sizeForPageInFlowView:)]) {
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_pageSize = [self.delegate sizeForPageInFlowView:self];
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}
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[_reusableCells removeAllObjects];
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_visibleRange = NSMakeRange(0, 0);
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//填充cells数组
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[_cells removeAllObjects];
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for (NSInteger index=0; index<_pageCount; index++)
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{
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[_cells addObject:[NSNull null]];
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}
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// 重置_scrollView的contentSize
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal://横向
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_scrollView.frame = CGRectMake(0, 0, _pageSize.width, _pageSize.height);
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_scrollView.contentSize = CGSizeMake(_pageSize.width * _pageCount,0);
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CGPoint theCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
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_scrollView.center = theCenter;
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if (self.orginPageCount > 1) {
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if (self.isCarousel) {
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//滚到第二组
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[_scrollView setContentOffset:CGPointMake(_pageSize.width * self.orginPageCount, 0) animated:NO];
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self.page = self.orginPageCount;
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//启动自动轮播
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[self startTimer];
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}else {
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//滚到开始
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[_scrollView setContentOffset:CGPointMake(0, 0) animated:NO];
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self.page = self.orginPageCount;
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}
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}
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break;
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case HQFlowViewOrientationVertical:{
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_scrollView.frame = CGRectMake(0, 0, _pageSize.width, _pageSize.height);
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_scrollView.contentSize = CGSizeMake(0 ,_pageSize.height * _pageCount);
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CGPoint theCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
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_scrollView.center = theCenter;
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if (self.orginPageCount > 1) {
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if (self.isCarousel) {
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//滚到第二组
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[_scrollView setContentOffset:CGPointMake(0, _pageSize.height * self.orginPageCount) animated:NO];
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self.page = self.orginPageCount;
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//启动自动轮播
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[self startTimer];
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}else {
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//滚到第二组
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[_scrollView setContentOffset:CGPointMake(0, 0) animated:NO];
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self.page = self.orginPageCount;
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}
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}
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break;
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}
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default:
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break;
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}
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_needsReload = NO;
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}
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[self setPagesAtContentOffset:_scrollView.contentOffset];//根据当前scrollView的offset设置cell
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[self refreshVisibleCellAppearance];
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//更新各个可见Cell的显示外貌
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}
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- (HQIndexBannerSubview *)dequeueReusableCell{
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HQIndexBannerSubview *cell = [_reusableCells lastObject];
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if (cell)
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{
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[_reusableCells removeLastObject];
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}
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return cell;
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}
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- (void)scrollToPage:(NSUInteger)pageNumber {
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if (pageNumber < _pageCount) {
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//首先停止定时器
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[self stopTimer];
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if (self.isCarousel) {
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self.page = pageNumber + self.orginPageCount;
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[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(startTimer) object:nil];
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[self performSelector:@selector(startTimer) withObject:nil afterDelay:0.5];
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}else {
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self.page = pageNumber;
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}
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:
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[_scrollView setContentOffset:CGPointMake(_pageSize.width * self.page, 0) animated:YES];
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break;
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case HQFlowViewOrientationVertical:
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[_scrollView setContentOffset:CGPointMake(0, _pageSize.height * self.page) animated:YES];
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break;
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}
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[self setPagesAtContentOffset:_scrollView.contentOffset];
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[self refreshVisibleCellAppearance];
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark -
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#pragma mark hitTest
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- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
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if ([self pointInside:point withEvent:event]) {
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CGPoint newPoint = CGPointZero;
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newPoint.x = point.x - _scrollView.frame.origin.x + _scrollView.contentOffset.x;
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newPoint.y = point.y - _scrollView.frame.origin.y + _scrollView.contentOffset.y;
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if ([_scrollView pointInside:newPoint withEvent:event]) {
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return [_scrollView hitTest:newPoint withEvent:event];
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}
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return _scrollView;
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}
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return nil;
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}
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#pragma mark -
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#pragma mark UIScrollView Delegate
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
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if (self.orginPageCount == 0) {
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return;
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}
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NSInteger pageIndex;
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:
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pageIndex = (int)round(_scrollView.contentOffset.x / _pageSize.width) % self.orginPageCount;
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break;
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case HQFlowViewOrientationVertical:
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pageIndex = (int)round(_scrollView.contentOffset.y / _pageSize.height) % self.orginPageCount;
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break;
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default:
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break;
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}
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if (self.isCarousel) {
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if (self.orginPageCount > 1) {
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:
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{
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if (scrollView.contentOffset.x / _pageSize.width >= 2 * self.orginPageCount) {
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[scrollView setContentOffset:CGPointMake(_pageSize.width * self.orginPageCount, 0) animated:NO];
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self.page = self.orginPageCount;
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}
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if (scrollView.contentOffset.x / _pageSize.width <= self.orginPageCount - 1) {
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[scrollView setContentOffset:CGPointMake((2 * self.orginPageCount - 1) * _pageSize.width, 0) animated:NO];
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self.page = 2 * self.orginPageCount;
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}
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}
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break;
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case HQFlowViewOrientationVertical:
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{
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if (scrollView.contentOffset.y / _pageSize.height >= 2 * self.orginPageCount) {
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[scrollView setContentOffset:CGPointMake(0, _pageSize.height * self.orginPageCount) animated:NO];
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self.page = self.orginPageCount;
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}
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if (scrollView.contentOffset.y / _pageSize.height <= self.orginPageCount - 1) {
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[scrollView setContentOffset:CGPointMake(0, (2 * self.orginPageCount - 1) * _pageSize.height) animated:NO];
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self.page = 2 * self.orginPageCount;
|
}
|
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}
|
break;
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default:
|
break;
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}
|
|
|
}else {
|
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pageIndex = 0;
|
|
|
}
|
}
|
|
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[self setPagesAtContentOffset:scrollView.contentOffset];
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[self refreshVisibleCellAppearance];
|
|
if (self.pageControl && [self.pageControl respondsToSelector:@selector(setCurrentPage:)]) {
|
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[self.pageControl setCurrentPage:pageIndex];
|
}
|
|
if (_delegate && [_delegate respondsToSelector:@selector(didScrollToPage:inFlowView:)] && _currentPageIndex != pageIndex && pageIndex >= 0) {
|
[_delegate didScrollToPage:pageIndex inFlowView:self];
|
}
|
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_currentPageIndex = pageIndex;
|
}
|
|
#pragma mark --将要开始拖拽
|
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
|
[self stopTimer];
|
}
|
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#pragma mark --结束拖拽
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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
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[self startTimer];
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}
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#pragma mark --将要结束拖拽
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- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
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if (self.orginPageCount > 1 && self.isOpenAutoScroll && self.isCarousel) {
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switch (self.orientation) {
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case HQFlowViewOrientationHorizontal:
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{
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if (self.page == floor(_scrollView.contentOffset.x / _pageSize.width)) {
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self.page = floor(_scrollView.contentOffset.x / _pageSize.width) + 1;
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}else {
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self.page = floor(_scrollView.contentOffset.x / _pageSize.width);
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}
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}
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break;
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case HQFlowViewOrientationVertical:
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{
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if (self.page == floor(_scrollView.contentOffset.y / _pageSize.height)) {
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self.page = floor(_scrollView.contentOffset.y / _pageSize.height) + 1;
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}else {
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self.page = floor(_scrollView.contentOffset.y / _pageSize.height);
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}
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}
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break;
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default:
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break;
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}
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}
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}
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//点击了cell
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- (void)singleCellTapAction:(NSInteger)selectTag withCell:(HQIndexBannerSubview *)cell {
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if (self.delegate && [self.delegate respondsToSelector:@selector(didSelectCell:withSubViewIndex:)]) {
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[self.delegate didSelectCell:cell withSubViewIndex:selectTag];
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}
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}
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//解决当父View释放时，当前视图因为被Timer强引用而不能释放的问题
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- (void)willMoveToSuperview:(UIView *)newSuperview {
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if (!newSuperview) {
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[self stopTimer];
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}
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}
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//解决当timer释放后 回调scrollViewDidScroll时访问野指针导致崩溃
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- (void)dealloc {
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_scrollView.delegate = nil;
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}
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@end
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