UIPanGestureRecognizer 左右滑动卡片,下拉滑动就是下拉刷新

旧城等待， 2022-07-15 23:30 228阅读 0赞

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做项目遇到手势冲突问题.

为了实现右滑划走,左滑划过来.下拉是下拉刷新功能.思考良久.我的卡片在tableview的header头视图上,所以左右滑能实现,卡片手势上下滑,没法带动下拉刷新.因为下拉刷新放在tableview上.

其实tableview继承UIScrollView自带默认手势

@property(nonatomic, readonly) UIPanGestureRecognizer \*panGestureRecognizer NS\_AVAILABLE\_IOS(5\_0);

开始通过获取卡片手势位移坐标

\- (CGPoint)translationInView:(nullable UIView \*)view;

判断左右上下滑动方向.做事件分发处理.改变tableview的contentoffset但是发现tableview的下拉刷新通过判断 dragging,但是

@property(nonatomic,readonly,getter=isDragging)     BOOL dragging; 是只读的

所以最后还是从手势上面下功夫,通过查博客,看API文档,发现手势的代理方法,部分如下:

\- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer \*)gestureRecognizer;

询问一个手势接收者是否应该开始解释执行一个触摸接收事件

\- (BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer \*)otherGestureRecognizer;

一个控件的手势识别后是否阻断手势识别继续向下传播，默认返回NO；如果为YES，响应者链上层对象触发手势识别后，如果下层对象也添加了手势并成功识别也会继续执行，否则上层对象识别后则不再继续传播；简单来说返回false响应一个,返回true 都响应

\- (BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer \*)otherGestureRecognizer NS\_AVAILABLE\_IOS(7\_0);

\- (BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer \*)otherGestureRecognizer NS\_AVAILABLE\_IOS(7\_0);

上面两个大致意思,每个视图都可以设置到,可以在两个之间设置交互.返回yes当前手势有效,false当前手势无效(第一条是这样)

\- (BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldReceiveTouch:(UITouch \*)touch;

询问delegate是否允许手势接收者接收一个touch对象

// 返回YES，则允许对这个touch对象审核，NO，则不允许。

// 这个方法在touchesBegan:withEvent:之前调用，为一个新的touch对象进行调用

\- (BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldReceivePress:(UIPress \*)press;

是否允许接受按得手势

最后解决办法是

\-(BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer \*)otherGestureRecognizer\{

NSLog(@"%@",\[\[otherGestureRecognizer view\] class\]);

if (\[\[otherGestureRecognizer view\] isKindOfClass:\[CarCardView class\]\]) \{

NSLog(@"%.2f,%.2f",\[(ZYZPanGestureRecognizer\*)otherGestureRecognizer translationInView:self\].y,\[(ZYZPanGestureRecognizer\*)otherGestureRecognizer translationInView:self\].x);

if (fabs(\[(ZYZPanGestureRecognizer\*)otherGestureRecognizer translationInView:self\].y) > fabs(\[(ZYZPanGestureRecognizer\*)otherGestureRecognizer translationInView:self\].x)) \{ //上下拉

\[self cancelOtherGestureRecognizer:otherGestureRecognizer\];

// \[self cancelOtherGestureRecognizer:gestureRecognizer\];

\}else\{

//\[self cancelOtherGestureRecognizer:gestureRecognizer\];

returnNO;// 同时响应,false就是响应一个

//取消当前手势响应事件

\- (void)cancelOtherGestureRecognizer:(UIGestureRecognizer \*)otherGestureRecognizer

ZYZPanGestureRecognizer \*ges = (ZYZPanGestureRecognizer\*)otherGestureRecognizer;

NSSet \*touchs = \[ges.event touchesForGestureRecognizer:otherGestureRecognizer\];

\[otherGestureRecognizer touchesCancelled:touchs withEvent:ges.event\];

让多个手势同时,只响应一个手势,判断位移,当前卡片手势左右位移,只显示一个没问题.当手势显示下拉,则取消当前手势的响应.默认取到手势响应链的上一层实现了,下拉刷新.

参考链接: