298 lines
12 KiB
Objective-C
298 lines
12 KiB
Objective-C
// 代码地址: https://github.com/CoderMJLee/MJRefresh
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// MJRefreshHeader.m
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// MJRefresh
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//
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// Created by MJ Lee on 15/3/4.
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// Copyright (c) 2015年 小码哥. All rights reserved.
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//
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#import "MJRefreshHeader.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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NSString * const MJRefreshHeaderRefreshing2IdleBoundsKey = @"MJRefreshHeaderRefreshing2IdleBounds";
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NSString * const MJRefreshHeaderRefreshingBoundsKey = @"MJRefreshHeaderRefreshingBounds";
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@interface MJRefreshHeader() <CAAnimationDelegate>
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@property (assign, nonatomic) CGFloat insetTDelta;
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@end
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@implementation MJRefreshHeader
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#pragma mark - 构造方法
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+ (instancetype)headerWithRefreshingBlock:(MJRefreshComponentAction)refreshingBlock
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{
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MJRefreshHeader *cmp = [[self alloc] init];
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cmp.refreshingBlock = refreshingBlock;
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return cmp;
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}
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+ (instancetype)headerWithRefreshingTarget:(id)target refreshingAction:(SEL)action
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{
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MJRefreshHeader *cmp = [[self alloc] init];
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[cmp setRefreshingTarget:target refreshingAction:action];
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return cmp;
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}
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#pragma mark - 覆盖父类的方法
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- (void)prepare
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{
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[super prepare];
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// 设置key
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self.lastUpdatedTimeKey = MJRefreshHeaderLastUpdatedTimeKey;
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// 设置高度
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self.mj_h = MJRefreshHeaderHeight;
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}
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- (void)placeSubviews
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{
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[super placeSubviews];
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// 设置y值(当自己的高度发生改变了，肯定要重新调整Y值，所以放到placeSubviews方法中设置y值)
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self.mj_y = - self.mj_h - self.ignoredScrollViewContentInsetTop;
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}
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- (void)resetInset {
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if (@available(iOS 11.0, *)) {
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} else {
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// 如果 iOS 10 及以下系统在刷新时, push 新的 VC, 等待刷新完成后回来, 会导致顶部 Insets.top 异常, 不能 resetInset, 检查一下这种特殊情况
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if (!self.window) { return; }
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}
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// sectionheader停留解决
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CGFloat insetT = - self.scrollView.mj_offsetY > _scrollViewOriginalInset.top ? - self.scrollView.mj_offsetY : _scrollViewOriginalInset.top;
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insetT = insetT > self.mj_h + _scrollViewOriginalInset.top ? self.mj_h + _scrollViewOriginalInset.top : insetT;
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self.insetTDelta = _scrollViewOriginalInset.top - insetT;
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// 避免 CollectionView 在使用根据 Autolayout 和 内容自动伸缩 Cell, 刷新时导致的 Layout 异常渲染问题
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if (self.scrollView.mj_insetT != insetT) {
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self.scrollView.mj_insetT = insetT;
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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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// 在刷新的refreshing状态
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if (self.state == MJRefreshStateRefreshing) {
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[self resetInset];
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return;
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}
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// 跳转到下一个控制器时，contentInset可能会变
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_scrollViewOriginalInset = self.scrollView.mj_inset;
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// 当前的contentOffset
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CGFloat offsetY = self.scrollView.mj_offsetY;
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// 头部控件刚好出现的offsetY
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CGFloat happenOffsetY = - self.scrollViewOriginalInset.top;
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// 如果是向上滚动到看不见头部控件，直接返回
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// >= -> >
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if (offsetY > happenOffsetY) return;
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// 普通 和 即将刷新 的临界点
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CGFloat normal2pullingOffsetY = happenOffsetY - self.mj_h;
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CGFloat pullingPercent = (happenOffsetY - offsetY) / self.mj_h;
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if (self.scrollView.isDragging) { // 如果正在拖拽
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self.pullingPercent = pullingPercent;
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if (self.state == MJRefreshStateIdle && offsetY < normal2pullingOffsetY) {
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// 转为即将刷新状态
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self.state = MJRefreshStatePulling;
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} else if (self.state == MJRefreshStatePulling && offsetY >= normal2pullingOffsetY) {
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// 转为普通状态
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self.state = MJRefreshStateIdle;
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}
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} else if (self.state == MJRefreshStatePulling) {// 即将刷新 && 手松开
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// 开始刷新
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[self beginRefreshing];
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} else if (pullingPercent < 1) {
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self.pullingPercent = pullingPercent;
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}
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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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// 根据状态做事情
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if (state == MJRefreshStateIdle) {
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if (oldState != MJRefreshStateRefreshing) return;
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[self headerEndingAction];
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} else if (state == MJRefreshStateRefreshing) {
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[self headerRefreshingAction];
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}
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}
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- (void)headerEndingAction {
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// 保存刷新时间
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[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:self.lastUpdatedTimeKey];
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[[NSUserDefaults standardUserDefaults] synchronize];
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// 默认使用 UIViewAnimation 动画
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if (!self.isCollectionViewAnimationBug) {
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// 恢复inset和offset
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[UIView animateWithDuration:self.slowAnimationDuration animations:^{
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self.scrollView.mj_insetT += self.insetTDelta;
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if (self.endRefreshingAnimationBeginAction) {
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self.endRefreshingAnimationBeginAction();
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}
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// 自动调整透明度
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if (self.isAutomaticallyChangeAlpha) self.alpha = 0.0;
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} completion:^(BOOL finished) {
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self.pullingPercent = 0.0;
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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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/**
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这个解决方法的思路出自 https://github.com/CoderMJLee/MJRefresh/pull/844
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修改了用+ [UIView animateWithDuration: animations:]实现的修改contentInset的动画
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fix issue#225 https://github.com/CoderMJLee/MJRefresh/issues/225
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另一种解法 pull#737 https://github.com/CoderMJLee/MJRefresh/pull/737
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同时, 处理了 Refreshing 中的动画替换.
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*/
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// 由于修改 Inset 会导致 self.pullingPercent 联动设置 self.alpha, 故提前获取 alpha 值, 后续用于还原 alpha 动画
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CGFloat viewAlpha = self.alpha;
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self.scrollView.mj_insetT += self.insetTDelta;
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// 禁用交互, 如果不禁用可能会引起渲染问题.
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self.scrollView.userInteractionEnabled = NO;
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//CAAnimation keyPath 不支持 contentInset 用Bounds的动画代替
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CABasicAnimation *boundsAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
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boundsAnimation.fromValue = [NSValue valueWithCGRect:CGRectOffset(self.scrollView.bounds, 0, self.insetTDelta)];
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boundsAnimation.duration = self.slowAnimationDuration;
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//在delegate里移除
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boundsAnimation.removedOnCompletion = NO;
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boundsAnimation.fillMode = kCAFillModeBoth;
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boundsAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
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boundsAnimation.delegate = self;
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[boundsAnimation setValue:MJRefreshHeaderRefreshing2IdleBoundsKey forKey:@"identity"];
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[self.scrollView.layer addAnimation:boundsAnimation forKey:MJRefreshHeaderRefreshing2IdleBoundsKey];
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if (self.endRefreshingAnimationBeginAction) {
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self.endRefreshingAnimationBeginAction();
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}
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// 自动调整透明度的动画
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if (self.isAutomaticallyChangeAlpha) {
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CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
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opacityAnimation.fromValue = @(viewAlpha);
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opacityAnimation.toValue = @(0.0);
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opacityAnimation.duration = self.slowAnimationDuration;
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opacityAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
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[self.layer addAnimation:opacityAnimation forKey:@"MJRefreshHeaderRefreshing2IdleOpacity"];
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// 由于修改了 inset 导致, pullingPercent 被设置值, alpha 已经被提前修改为 0 了. 所以这里不用置 0, 但为了代码的严谨性, 不依赖其他的特殊实现方式, 这里还是置 0.
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self.alpha = 0;
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}
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}
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- (void)headerRefreshingAction {
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// 默认使用 UIViewAnimation 动画
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if (!self.isCollectionViewAnimationBug) {
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[UIView animateWithDuration:self.fastAnimationDuration animations:^{
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if (self.scrollView.panGestureRecognizer.state != UIGestureRecognizerStateCancelled) {
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CGFloat top = self.scrollViewOriginalInset.top + self.mj_h;
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// 增加滚动区域top
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self.scrollView.mj_insetT = top;
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// 设置滚动位置
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CGPoint offset = self.scrollView.contentOffset;
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offset.y = -top;
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[self.scrollView setContentOffset:offset animated:NO];
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}
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} completion:^(BOOL finished) {
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[self executeRefreshingCallback];
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}];
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return;
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}
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if (self.scrollView.panGestureRecognizer.state != UIGestureRecognizerStateCancelled) {
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CGFloat top = self.scrollViewOriginalInset.top + self.mj_h;
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// 禁用交互, 如果不禁用可能会引起渲染问题.
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self.scrollView.userInteractionEnabled = NO;
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// CAAnimation keyPath不支持 contentOffset 用Bounds的动画代替
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CABasicAnimation *boundsAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
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CGRect bounds = self.scrollView.bounds;
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bounds.origin.y = -top;
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boundsAnimation.fromValue = [NSValue valueWithCGRect:self.scrollView.bounds];
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boundsAnimation.toValue = [NSValue valueWithCGRect:bounds];
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boundsAnimation.duration = self.fastAnimationDuration;
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//在delegate里移除
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boundsAnimation.removedOnCompletion = NO;
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boundsAnimation.fillMode = kCAFillModeBoth;
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boundsAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
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boundsAnimation.delegate = self;
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[boundsAnimation setValue:MJRefreshHeaderRefreshingBoundsKey forKey:@"identity"];
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[self.scrollView.layer addAnimation:boundsAnimation forKey:MJRefreshHeaderRefreshingBoundsKey];
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} else {
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[self executeRefreshingCallback];
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}
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}
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#pragma mark . 链式语法部分 .
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- (instancetype)linkTo:(UIScrollView *)scrollView {
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scrollView.mj_header = self;
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return self;
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}
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#pragma mark - CAAnimationDelegate
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- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
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NSString *identity = [anim valueForKey:@"identity"];
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if ([identity isEqualToString:MJRefreshHeaderRefreshing2IdleBoundsKey]) {
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self.pullingPercent = 0.0;
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self.scrollView.userInteractionEnabled = YES;
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if (self.endRefreshingCompletionBlock) {
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self.endRefreshingCompletionBlock();
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}
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} else if ([identity isEqualToString:MJRefreshHeaderRefreshingBoundsKey]) {
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// 避免出现 end 先于 Refreshing 状态
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if (self.state != MJRefreshStateIdle) {
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CGFloat top = self.scrollViewOriginalInset.top + self.mj_h;
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self.scrollView.mj_insetT = top;
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// 设置最终滚动位置
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CGPoint offset = self.scrollView.contentOffset;
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offset.y = -top;
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[self.scrollView setContentOffset:offset animated:NO];
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}
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self.scrollView.userInteractionEnabled = YES;
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[self executeRefreshingCallback];
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}
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if ([self.scrollView.layer animationForKey:MJRefreshHeaderRefreshing2IdleBoundsKey]) {
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[self.scrollView.layer removeAnimationForKey:MJRefreshHeaderRefreshing2IdleBoundsKey];
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}
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if ([self.scrollView.layer animationForKey:MJRefreshHeaderRefreshingBoundsKey]) {
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[self.scrollView.layer removeAnimationForKey:MJRefreshHeaderRefreshingBoundsKey];
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}
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}
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#pragma mark - 公共方法
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- (NSDate *)lastUpdatedTime
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{
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return [[NSUserDefaults standardUserDefaults] objectForKey:self.lastUpdatedTimeKey];
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}
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- (void)setIgnoredScrollViewContentInsetTop:(CGFloat)ignoredScrollViewContentInsetTop {
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_ignoredScrollViewContentInsetTop = ignoredScrollViewContentInsetTop;
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self.mj_y = - self.mj_h - _ignoredScrollViewContentInsetTop;
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}
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@end
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