//
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// MJRefreshAutoFooter.m
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// MJRefresh
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//
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// Created by MJ Lee on 15/4/24.
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// Copyright (c) 2015年 小码哥. All rights reserved.
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//
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#import "MJRefreshAutoFooter.h"
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#import "NSBundle+MJRefresh.h"
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#import "UIView+MJExtension.h"
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#import "UIScrollView+MJExtension.h"
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#import "UIScrollView+MJRefresh.h"
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@interface MJRefreshAutoFooter()
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/** 一个新的拖拽 */
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@property (nonatomic) BOOL triggerByDrag;
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@property (nonatomic) NSInteger leftTriggerTimes;
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@end
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@implementation MJRefreshAutoFooter
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#pragma mark - 初始化
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- (void)willMoveToSuperview:(UIView *)newSuperview
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{
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[super willMoveToSuperview:newSuperview];
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if (newSuperview) { // 新的父控件
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if (self.hidden == NO) {
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self.scrollView.mj_insetB += self.mj_h;
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}
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// 设置位置
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self.mj_y = _scrollView.mj_contentH;
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} else { // 被移除了
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if (self.hidden == NO) {
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self.scrollView.mj_insetB -= self.mj_h;
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}
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}
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}
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#pragma mark - 过期方法
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- (void)setAppearencePercentTriggerAutoRefresh:(CGFloat)appearencePercentTriggerAutoRefresh
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{
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self.triggerAutomaticallyRefreshPercent = appearencePercentTriggerAutoRefresh;
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}
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- (CGFloat)appearencePercentTriggerAutoRefresh
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{
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return self.triggerAutomaticallyRefreshPercent;
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}
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#pragma mark - 实现父类的方法
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- (void)prepare
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{
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[super prepare];
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// 默认底部控件100%出现时才会自动刷新
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self.triggerAutomaticallyRefreshPercent = 1.0;
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// 设置为默认状态
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self.automaticallyRefresh = YES;
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self.autoTriggerTimes = 1;
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}
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- (void)scrollViewContentSizeDidChange:(NSDictionary *)change
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{
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[super scrollViewContentSizeDidChange:change];
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CGSize size = [change[NSKeyValueChangeNewKey] CGSizeValue];
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CGFloat contentHeight = size.height == 0 ? self.scrollView.mj_contentH : size.height;
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// 设置位置
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CGFloat y = contentHeight + self.ignoredScrollViewContentInsetBottom;
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if (self.mj_y != y) {
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self.mj_y = y;
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}
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}
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- (void)scrollViewContentOffsetDidChange:(NSDictionary *)change
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{
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[super scrollViewContentOffsetDidChange:change];
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if (self.state != MJRefreshStateIdle || !self.automaticallyRefresh || self.mj_y == 0) return;
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if (_scrollView.mj_insetT + _scrollView.mj_contentH > _scrollView.mj_h) { // 内容超过一个屏幕
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// 这里的_scrollView.mj_contentH替换掉self.mj_y更为合理
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if (_scrollView.mj_offsetY >= _scrollView.mj_contentH - _scrollView.mj_h + self.mj_h * self.triggerAutomaticallyRefreshPercent + _scrollView.mj_insetB - self.mj_h) {
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// 防止手松开时连续调用
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CGPoint old = [change[@"old"] CGPointValue];
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CGPoint new = [change[@"new"] CGPointValue];
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if (new.y <= old.y) return;
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if (_scrollView.isDragging) {
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self.triggerByDrag = YES;
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}
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// 当底部刷新控件完全出现时，才刷新
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[self beginRefreshing];
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}
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}
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}
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- (void)scrollViewPanStateDidChange:(NSDictionary *)change
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{
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[super scrollViewPanStateDidChange:change];
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if (self.state != MJRefreshStateIdle) return;
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UIGestureRecognizerState panState = _scrollView.panGestureRecognizer.state;
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switch (panState) {
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// 手松开
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case UIGestureRecognizerStateEnded: {
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if (_scrollView.mj_insetT + _scrollView.mj_contentH <= _scrollView.mj_h) { // 不够一个屏幕
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if (_scrollView.mj_offsetY >= - _scrollView.mj_insetT) { // 向上拽
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self.triggerByDrag = YES;
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[self beginRefreshing];
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}
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} else { // 超出一个屏幕
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if (_scrollView.mj_offsetY >= _scrollView.mj_contentH + _scrollView.mj_insetB - _scrollView.mj_h) {
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self.triggerByDrag = YES;
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[self beginRefreshing];
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}
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}
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}
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break;
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case UIGestureRecognizerStateBegan: {
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[self resetTriggerTimes];
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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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- (BOOL)unlimitedTrigger {
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return self.leftTriggerTimes == -1;
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}
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- (void)beginRefreshing
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{
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if (self.triggerByDrag && self.leftTriggerTimes <= 0 && !self.unlimitedTrigger) {
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return;
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}
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[super beginRefreshing];
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}
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- (void)setState:(MJRefreshState)state
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{
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MJRefreshCheckState
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if (state == MJRefreshStateRefreshing) {
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[self executeRefreshingCallback];
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} else if (state == MJRefreshStateNoMoreData || state == MJRefreshStateIdle) {
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if (self.triggerByDrag) {
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if (!self.unlimitedTrigger) {
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self.leftTriggerTimes -= 1;
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}
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self.triggerByDrag = NO;
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}
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if (MJRefreshStateRefreshing == oldState) {
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if (self.scrollView.pagingEnabled) {
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CGPoint offset = self.scrollView.contentOffset;
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offset.y -= self.scrollView.mj_insetB;
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[UIView animateWithDuration:self.slowAnimationDuration animations:^{
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self.scrollView.contentOffset = offset;
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if (self.endRefreshingAnimationBeginAction) {
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self.endRefreshingAnimationBeginAction();
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}
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} completion:^(BOOL finished) {
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if (self.endRefreshingCompletionBlock) {
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self.endRefreshingCompletionBlock();
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}
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}];
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return;
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}
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if (self.endRefreshingCompletionBlock) {
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self.endRefreshingCompletionBlock();
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}
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}
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}
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}
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- (void)resetTriggerTimes {
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self.leftTriggerTimes = self.autoTriggerTimes;
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}
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- (void)setHidden:(BOOL)hidden
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{
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BOOL lastHidden = self.isHidden;
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[super setHidden:hidden];
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if (!lastHidden && hidden) {
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self.state = MJRefreshStateIdle;
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self.scrollView.mj_insetB -= self.mj_h;
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} else if (lastHidden && !hidden) {
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self.scrollView.mj_insetB += self.mj_h;
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// 设置位置
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self.mj_y = _scrollView.mj_contentH;
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}
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}
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- (void)setAutoTriggerTimes:(NSInteger)autoTriggerTimes {
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_autoTriggerTimes = autoTriggerTimes;
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self.leftTriggerTimes = autoTriggerTimes;
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}
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@end
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