// 代码地址: https://github.com/CoderMJLee/MJRefresh
|
// 代码地址: http://code4app.com/ios/%E5%BF%AB%E9%80%9F%E9%9B%86%E6%88%90%E4%B8%8B%E6%8B%89%E4%B8%8A%E6%8B%89%E5%88%B7%E6%96%B0/52326ce26803fabc46000000
|
// MJRefreshHeader.m
|
// MJRefreshExample
|
//
|
// Created by MJ Lee on 15/3/4.
|
// Copyright (c) 2015年 小码哥. All rights reserved.
|
//
|
|
#import "MJRefreshHeader.h"
|
|
NSString * const MJRefreshHeaderRefreshing2IdleBoundsKey = @"MJRefreshHeaderRefreshing2IdleBounds";
|
NSString * const MJRefreshHeaderRefreshingBoundsKey = @"MJRefreshHeaderRefreshingBounds";
|
|
@interface MJRefreshHeader() <CAAnimationDelegate>
|
@property (assign, nonatomic) CGFloat insetTDelta;
|
@end
|
|
@implementation MJRefreshHeader
|
#pragma mark - 构造方法
|
+ (instancetype)headerWithRefreshingBlock:(MJRefreshComponentAction)refreshingBlock
|
{
|
MJRefreshHeader *cmp = [[self alloc] init];
|
cmp.refreshingBlock = refreshingBlock;
|
return cmp;
|
}
|
+ (instancetype)headerWithRefreshingTarget:(id)target refreshingAction:(SEL)action
|
{
|
MJRefreshHeader *cmp = [[self alloc] init];
|
[cmp setRefreshingTarget:target refreshingAction:action];
|
return cmp;
|
}
|
|
#pragma mark - 覆盖父类的方法
|
- (void)prepare
|
{
|
[super prepare];
|
|
// 设置key
|
self.lastUpdatedTimeKey = MJRefreshHeaderLastUpdatedTimeKey;
|
|
// 设置高度
|
self.mj_h = MJRefreshHeaderHeight;
|
}
|
|
- (void)placeSubviews
|
{
|
[super placeSubviews];
|
|
// 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)
|
self.mj_y = - self.mj_h - self.ignoredScrollViewContentInsetTop;
|
}
|
|
- (void)resetInset {
|
if (@available(iOS 11.0, *)) {
|
} else {
|
// 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
|
if (!self.window) { return; }
|
}
|
|
// sectionheader停留解决
|
CGFloat insetT = - self.scrollView.mj_offsetY > _scrollViewOriginalInset.top ? - self.scrollView.mj_offsetY : _scrollViewOriginalInset.top;
|
insetT = insetT > self.mj_h + _scrollViewOriginalInset.top ? self.mj_h + _scrollViewOriginalInset.top : insetT;
|
self.insetTDelta = _scrollViewOriginalInset.top - insetT;
|
// 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
|
if (self.scrollView.mj_insetT != insetT) {
|
self.scrollView.mj_insetT = insetT;
|
}
|
}
|
|
- (void)scrollViewContentOffsetDidChange:(NSDictionary *)change
|
{
|
[super scrollViewContentOffsetDidChange:change];
|
|
// 在刷新的refreshing状态
|
if (self.state == MJRefreshStateRefreshing) {
|
[self resetInset];
|
return;
|
}
|
|
// 跳转到下一个控制器时，contentInset可能会变
|
_scrollViewOriginalInset = self.scrollView.mj_inset;
|
|
// 当前的contentOffset
|
CGFloat offsetY = self.scrollView.mj_offsetY;
|
// 头部控件刚好出现的offsetY
|
CGFloat happenOffsetY = - self.scrollViewOriginalInset.top;
|
|
// 如果是向上滚动到看不见头部控件，直接返回
|
// >= -> >
|
if (offsetY > happenOffsetY) return;
|
|
// 普通 和 即将刷新 的临界点
|
CGFloat normal2pullingOffsetY = happenOffsetY - self.mj_h;
|
CGFloat pullingPercent = (happenOffsetY - offsetY) / self.mj_h;
|
|
if (self.scrollView.isDragging) { // 如果正在拖拽
|
self.pullingPercent = pullingPercent;
|
if (self.state == MJRefreshStateIdle && offsetY < normal2pullingOffsetY) {
|
// 转为即将刷新状态
|
self.state = MJRefreshStatePulling;
|
} else if (self.state == MJRefreshStatePulling && offsetY >= normal2pullingOffsetY) {
|
// 转为普通状态
|
self.state = MJRefreshStateIdle;
|
}
|
} else if (self.state == MJRefreshStatePulling) {// 即将刷新 && 手松开
|
// 开始刷新
|
[self beginRefreshing];
|
} else if (pullingPercent < 1) {
|
self.pullingPercent = pullingPercent;
|
}
|
}
|
|
- (void)setState:(MJRefreshState)state
|
{
|
MJRefreshCheckState
|
|
// 根据状态做事情
|
if (state == MJRefreshStateIdle) {
|
if (oldState != MJRefreshStateRefreshing) return;
|
|
[self headerEndingAction];
|
} else if (state == MJRefreshStateRefreshing) {
|
[self headerRefreshingAction];
|
}
|
}
|
|
- (void)headerEndingAction {
|
// 保存刷新时间
|
[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:self.lastUpdatedTimeKey];
|
[[NSUserDefaults standardUserDefaults] synchronize];
|
|
// 默认使用 UIViewAnimation 动画
|
if (!self.isCollectionViewAnimationBug) {
|
// 恢复inset和offset
|
[UIView animateWithDuration:MJRefreshSlowAnimationDuration animations:^{
|
self.scrollView.mj_insetT += self.insetTDelta;
|
|
if (self.endRefreshingAnimationBeginAction) {
|
self.endRefreshingAnimationBeginAction();
|
}
|
// 自动调整透明度
|
if (self.isAutomaticallyChangeAlpha) self.alpha = 0.0;
|
} completion:^(BOOL finished) {
|
self.pullingPercent = 0.0;
|
|
if (self.endRefreshingCompletionBlock) {
|
self.endRefreshingCompletionBlock();
|
}
|
}];
|
|
return;
|
}
|
|
/**
|
这个解决方法的思路出自 https://github.com/CoderMJLee/MJRefresh/pull/844
|
修改了用+ [UIView animateWithDuration: animations:]实现的修改contentInset的动画
|
fix issue#225 https://github.com/CoderMJLee/MJRefresh/issues/225
|
另一种解法 pull#737 https://github.com/CoderMJLee/MJRefresh/pull/737
|
|
同时, 处理了 Refreshing 中的动画替换.
|
*/
|
|
// 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
|
CGFloat viewAlpha = self.alpha;
|
|
self.scrollView.mj_insetT += self.insetTDelta;
|
// 禁用交互, 如果不禁用可能会引起渲染问题.
|
self.scrollView.userInteractionEnabled = NO;
|
|
//CAAnimation keyPath 不支持 contentInset 用Bounds的动画代替
|
CABasicAnimation *boundsAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
|
boundsAnimation.fromValue = [NSValue valueWithCGRect:CGRectOffset(self.scrollView.bounds, 0, self.insetTDelta)];
|
boundsAnimation.duration = MJRefreshSlowAnimationDuration;
|
//在delegate里移除
|
boundsAnimation.removedOnCompletion = NO;
|
boundsAnimation.fillMode = kCAFillModeBoth;
|
boundsAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
|
boundsAnimation.delegate = self;
|
[boundsAnimation setValue:MJRefreshHeaderRefreshing2IdleBoundsKey forKey:@"identity"];
|
|
[self.scrollView.layer addAnimation:boundsAnimation forKey:MJRefreshHeaderRefreshing2IdleBoundsKey];
|
|
if (self.endRefreshingAnimationBeginAction) {
|
self.endRefreshingAnimationBeginAction();
|
}
|
// 自动调整透明度的动画
|
if (self.isAutomaticallyChangeAlpha) {
|
CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
|
opacityAnimation.fromValue = @(viewAlpha);
|
opacityAnimation.toValue = @(0.0);
|
opacityAnimation.duration = MJRefreshSlowAnimationDuration;
|
opacityAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
|
[self.layer addAnimation:opacityAnimation forKey:@"MJRefreshHeaderRefreshing2IdleOpacity"];
|
|
// 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.
|
self.alpha = 0;
|
}
|
}
|
|
- (void)headerRefreshingAction {
|
// 默认使用 UIViewAnimation 动画
|
if (!self.isCollectionViewAnimationBug) {
|
MJRefreshDispatchAsyncOnMainQueue({
|
[UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{
|
if (self.scrollView.panGestureRecognizer.state != UIGestureRecognizerStateCancelled) {
|
CGFloat top = self.scrollViewOriginalInset.top + self.mj_h;
|
// 增加滚动区域top
|
self.scrollView.mj_insetT = top;
|
// 设置滚动位置
|
CGPoint offset = self.scrollView.contentOffset;
|
offset.y = -top;
|
[self.scrollView setContentOffset:offset animated:NO];
|
}
|
} completion:^(BOOL finished) {
|
[self executeRefreshingCallback];
|
}];
|
})
|
return;
|
}
|
|
if (self.scrollView.panGestureRecognizer.state != UIGestureRecognizerStateCancelled) {
|
CGFloat top = self.scrollViewOriginalInset.top + self.mj_h;
|
// 禁用交互, 如果不禁用可能会引起渲染问题.
|
self.scrollView.userInteractionEnabled = NO;
|
|
// CAAnimation keyPath不支持 contentOffset 用Bounds的动画代替
|
CABasicAnimation *boundsAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
|
CGRect bounds = self.scrollView.bounds;
|
bounds.origin.y = -top;
|
boundsAnimation.fromValue = [NSValue valueWithCGRect:self.scrollView.bounds];
|
boundsAnimation.toValue = [NSValue valueWithCGRect:bounds];
|
boundsAnimation.duration = MJRefreshFastAnimationDuration;
|
//在delegate里移除
|
boundsAnimation.removedOnCompletion = NO;
|
boundsAnimation.fillMode = kCAFillModeBoth;
|
boundsAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
|
boundsAnimation.delegate = self;
|
[boundsAnimation setValue:MJRefreshHeaderRefreshingBoundsKey forKey:@"identity"];
|
[self.scrollView.layer addAnimation:boundsAnimation forKey:MJRefreshHeaderRefreshingBoundsKey];
|
} else {
|
[self executeRefreshingCallback];
|
}
|
}
|
|
#pragma mark - CAAnimationDelegate
|
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
|
NSString *identity = [anim valueForKey:@"identity"];
|
if ([identity isEqualToString:MJRefreshHeaderRefreshing2IdleBoundsKey]) {
|
self.pullingPercent = 0.0;
|
self.scrollView.userInteractionEnabled = YES;
|
if (self.endRefreshingCompletionBlock) {
|
self.endRefreshingCompletionBlock();
|
}
|
} else if ([identity isEqualToString:MJRefreshHeaderRefreshingBoundsKey]) {
|
// 避免出现 end 先于 Refreshing 状态
|
if (self.state != MJRefreshStateIdle) {
|
CGFloat top = self.scrollViewOriginalInset.top + self.mj_h;
|
self.scrollView.mj_insetT = top;
|
// 设置最终滚动位置
|
CGPoint offset = self.scrollView.contentOffset;
|
offset.y = -top;
|
[self.scrollView setContentOffset:offset animated:NO];
|
}
|
self.scrollView.userInteractionEnabled = YES;
|
[self executeRefreshingCallback];
|
}
|
|
if ([self.scrollView.layer animationForKey:MJRefreshHeaderRefreshing2IdleBoundsKey]) {
|
[self.scrollView.layer removeAnimationForKey:MJRefreshHeaderRefreshing2IdleBoundsKey];
|
}
|
|
if ([self.scrollView.layer animationForKey:MJRefreshHeaderRefreshingBoundsKey]) {
|
[self.scrollView.layer removeAnimationForKey:MJRefreshHeaderRefreshingBoundsKey];
|
}
|
}
|
|
#pragma mark - 公共方法
|
- (NSDate *)lastUpdatedTime
|
{
|
return [[NSUserDefaults standardUserDefaults] objectForKey:self.lastUpdatedTimeKey];
|
}
|
|
- (void)setIgnoredScrollViewContentInsetTop:(CGFloat)ignoredScrollViewContentInsetTop {
|
_ignoredScrollViewContentInsetTop = ignoredScrollViewContentInsetTop;
|
|
self.mj_y = - self.mj_h - _ignoredScrollViewContentInsetTop;
|
}
|
|
@end
|
