//
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// FFRereshView.m
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// FFPage
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//
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// Created by North on 2019/8/14.
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// Copyright © 2019 North. All rights reserved.
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//
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#import "FFRereshView.h"
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#import "FFPage.h"
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static NSString * contentOffset = @"contentOffset";
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static NSString * contentSize = @"contentSize";
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static NSString * PanState = @"state";
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static NSString * superBounds = @"bounds";
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@interface FFRereshView ()
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/**
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回调块
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*/
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@property (copy, nonatomic) FFRefreshBlock refreshBlock;
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/**
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对象
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*/
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@property (nonatomic) id target;
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/**
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方法
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*/
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@property (nonatomic) SEL action;
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/**
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物理动画容器
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*/
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@property(nonatomic, strong) UIDynamicAnimator *dynamicAnimator;
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/**
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回弹行为
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*/
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@property(nonatomic, weak) UIAttachmentBehavior *bounceBehavior;
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@end
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@implementation FFRereshView
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- (instancetype)initWithFrame:(CGRect)frame{
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self = [super initWithFrame:frame];
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if (self) {
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[self setUpSubView];
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}
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return self;
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}
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+ (instancetype)initWithRefreshBlock:(FFRefreshBlock)block{
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FFRereshView * view = [[self alloc] init];
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view.refreshBlock = block;
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return view;
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}
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+ (instancetype)initWithTarget:(id)target action:(SEL)action {
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FFRereshView * view = [[self alloc] init];
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view.target = target;
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view.action = action;
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return view;
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}
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- (CGFloat)refreshHeight{
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return 50;
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}
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- (void)setUpSubView{}
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- (void)setUpKVO{
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NSKeyValueObservingOptions options = NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld;
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[self.scrollView addObserver:self forKeyPath:contentOffset options:options context:nil];
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//监听滚动视图大小改变 以及可能的设备方向改变
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[self.scrollView addObserver:self forKeyPath:superBounds options:options context:nil];
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if (self.isFooter) {
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[self.scrollView addObserver:self forKeyPath:contentSize options:options context:nil];
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}
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}
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- (void)removeKVO{
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[self.scrollView removeObserver:self forKeyPath:contentOffset];
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[self.scrollView removeObserver:self forKeyPath:superBounds];
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if (self.isFooter) [self.scrollView removeObserver:self forKeyPath:contentSize];
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
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if ([keyPath isEqualToString:contentOffset]) {
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[self calcuStatusAndProgress];
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} else if ([keyPath isEqualToString:contentSize]) {
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[self updateFrame];
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} else if ([keyPath isEqualToString:superBounds]) {
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[self updateFrame];
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}
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}
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- (void)willMoveToSuperview:(UIView *)newSuperview{
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[super willMoveToSuperview:newSuperview];
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if (!newSuperview || ![newSuperview isKindOfClass:[UIScrollView class]]) return;
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if (self.scrollView) [self removeKVO];
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self.scrollView = (UIScrollView *)newSuperview;
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self.dynamicAnimator =[[UIDynamicAnimator alloc]initWithReferenceView:self];
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[self updateTouchStatus];
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[self setUpKVO];
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[self updateFrame];
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}
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- (void)willMoveToWindow:(UIWindow *)newWindow{
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[super willMoveToWindow:newWindow];
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[self updateFrame];
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}
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- (void)updateTouchStatus{
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__weak typeof(self) weakself = self;
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[self.scrollView addTounchBlock:^(BOOL isTouch) {
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[weakself touchEndAction];
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}];
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}
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- (void)touchEndAction{
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if(self.scrollView.isTouch )return;
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if(self.status == FFRereshStatusWillBeginRefresh){
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[self beginRefresh];
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}
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if(self.status == FFRereshStatusWillEndRefresh){
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[self endRefresh];
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}
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}
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- (void)calcuStatusAndProgress{
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if (!self.scrollView.isTouch) return;
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if (self.status == FFRereshStatusRereshing) return;
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CGFloat offY = self.scrollView.contentOffset.y;
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//头部
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if (!self.isFooter && offY < 0) {
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CGFloat scale = fabs(offY)/[self refreshHeight];
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if (scale > 1) scale = 1;
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self.percent = scale;
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} else if (self.isFooter && offY > self.scrollView.maxOffsetY) {
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CGFloat scale = (offY - MAX(0, self.scrollView.contentSize.height - CGRectGetHeight(self.scrollView.bounds)))/[self refreshHeight];
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if (scale > 1) scale = 1;
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self.percent = scale;
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}
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if(self.percent <= 0 && self.status != FFRereshStatusNormal){
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self.status = FFRereshStatusNormal;
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return;
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}
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if (self.percent > 0 &&
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self.percent < 1 &&
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self.status == FFRereshStatusNormal) {
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self.status = FFRereshStatusPulling;
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return;
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}
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if (self.percent >= 1 &&
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(self.status == FFRereshStatusPulling || self.status == FFRereshStatusWillEndRefresh)) {
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self.status = FFRereshStatusWillBeginRefresh;
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return;
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}
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if (self.percent > 0 &&
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self.percent < 1 &&
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self.status == FFRereshStatusWillBeginRefresh
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) {
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self.status = FFRereshStatusWillEndRefresh;
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return;
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}
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return;
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}
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@synthesize percent = _percent;
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- (void)setPercent:(CGFloat)percent{
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if (_percent != percent) {
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_percent = percent;
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[self percentUpdated];
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}
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}
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@synthesize status = _status;
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- (void)setStatus:(FFRereshStatus)status{
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if (self.status != status) {
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_status = status;
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UIEdgeInsets inset = self.scrollView.contentInset;
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//在将要刷新的时候 设置
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if (_status == FFRereshStatusWillBeginRefresh) {
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if (!self.isFooter) inset.top = [self refreshHeight];
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else inset.bottom = [self refreshHeight];
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}
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if (_status == FFRereshStatusNormal) {
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if (!self.isFooter) inset.top = 0;
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else inset.bottom = 0;
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}
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self.scrollView.contentInset = inset;
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[self statusUpdated];
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}
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}
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- (void)statusUpdated{
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}
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- (void)percentUpdated{
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}
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- (void)updateFrame{
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CGFloat height = [self refreshHeight];
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if (self.isFooter) {
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self.frame = CGRectMake(0,MAX(self.scrollView.contentSize.height, CGRectGetHeight(self.scrollView.bounds)), CGRectGetWidth(self.scrollView.bounds), height);
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return;
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}
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self.frame = CGRectMake(0, - height, CGRectGetWidth(self.scrollView.bounds), height);
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}
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- (void)beginRefresh{
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if (self.status == FFRereshStatusRereshing) return;
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//代码调用刷新
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if (self.status == FFRereshStatusNormal) {
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self.status = FFRereshStatusWillBeginRefresh;
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[self beginRefresh];
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return;
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}
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//交互中不允许
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if (self.scrollView.isTouch ) return;
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self.status = FFRereshStatusRereshing;
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if (self.refreshBlock)self.refreshBlock();
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if (self.target && self.action) [self.target performSelectorOnMainThread:self.action withObject:nil waitUntilDone:NO];
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//只有顶部刷新的时候才会强制滚动
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if(self.isFooter)return;
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self.scrollView.isAnimationing = YES;
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[[NSNotificationCenter defaultCenter] postNotificationName:FFPageBeginRefreshNotice object:self userInfo:nil];
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CGFloat targetOffY = -self.refreshHeight;
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//删除所有物理行为
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[self.dynamicAnimator removeAllBehaviors];
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self.bounceBehavior = nil;
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// 增加一个附着的行为
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FFDynamicItem *item = [[FFDynamicItem alloc] init];
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item.center = self.scrollView.contentOffset;
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UIAttachmentBehavior *bounceBehavior = [[UIAttachmentBehavior alloc] initWithItem:item attachedToAnchor:CGPointMake(0, targetOffY)];
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bounceBehavior.length = 0;
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bounceBehavior.damping = 1;
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bounceBehavior.frequency = 4;
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__weak typeof(self) weakSelf = self;
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bounceBehavior.action = ^{
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weakSelf.scrollView.contentOffset = CGPointMake(0, item.center.y);
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if (fabs(weakSelf.scrollView.contentOffset.y - targetOffY) < FLT_EPSILON) {
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[weakSelf.dynamicAnimator removeAllBehaviors];
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weakSelf.bounceBehavior = nil;
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weakSelf.scrollView.isAnimationing = NO;
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}
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};
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self.bounceBehavior = bounceBehavior;
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[self.dynamicAnimator addBehavior:bounceBehavior];
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}
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- (void)endRefresh{
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// 如果是普通状态直接返回
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if (self.status == FFRereshStatusNormal) return;
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// 如果是正在刷新
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if (self.status == FFRereshStatusRereshing) {
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// 将要结束刷新
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self.status = FFRereshStatusWillEndRefresh;
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[self endRefresh];
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return;
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}
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//交互中 不允许执行结束动画
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if (self.scrollView.isTouch) return;
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//结束的目标点
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CGFloat maxOffY = MAX(0, self.scrollView.contentSize.height - CGRectGetHeight(self.scrollView.bounds));
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//底部结束刷新时，控件被移出屏幕
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if(self.isFooter && self.scrollView.contentOffset.y < maxOffY){
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self.status = FFRereshStatusNormal;
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return;
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}
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// 设置正在动画中
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self.scrollView.isAnimationing = YES;
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[[NSNotificationCenter defaultCenter] postNotificationName:FFPageEndRefreshNotice object:self userInfo:nil];
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// 结束时回到的偏移量 ceil(maxOffY)防止maxoffy精度丢失
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CGFloat targetOffY = self.isFooter ? ceil(maxOffY): 0;
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//删除所有物理行为
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[self.dynamicAnimator removeAllBehaviors];
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self.bounceBehavior = nil;
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// 增加一个附着的行为
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FFDynamicItem *item = [[FFDynamicItem alloc] init];
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item.center = self.scrollView.contentOffset;
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UIAttachmentBehavior *bounceBehavior = [[UIAttachmentBehavior alloc] initWithItem:item attachedToAnchor:CGPointMake(0, targetOffY)];
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bounceBehavior.length = 0;
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bounceBehavior.damping = 1;
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bounceBehavior.frequency = 4;
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__weak typeof(self) weakSelf = self;
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bounceBehavior.action = ^{
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weakSelf.scrollView.contentOffset = CGPointMake(0, item.center.y);
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if (fabs(weakSelf.scrollView.contentOffset.y - targetOffY) < FLT_EPSILON) {
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[weakSelf.dynamicAnimator removeAllBehaviors];
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weakSelf.bounceBehavior = nil;
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weakSelf.scrollView.isAnimationing = NO;
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weakSelf.status = FFRereshStatusNormal;
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}
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};
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self.bounceBehavior = bounceBehavior;
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[self.dynamicAnimator addBehavior:bounceBehavior];
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}
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- (void)dealloc{
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[self removeKVO];
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}
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@end
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