如何检测同时手势的结束？ (IOS)

概述在我的应用程序中,我同时使用UIPinchGestureRecognizer,UIRotationGestureRecognizer和UIPanGestureRecognizer进行缩放,旋转和移动图像. 方法gestureRecognizer：shouldRecognizeSimultaneouslyWithGestureRecognizer：始终返回YES并且图像处理效果很好,但是……如何检测 @H_403_6@ 在我的应用程序中,我同时使用UIPinchGestureRecognizer,UIRotationGestureRecognizer和UIPanGestureRecognizer进行缩放,旋转和移动图像.

方法gestureRecognizer：shouldRecognizeSimultaneouslyWithGestureRecognizer：始终返回YES并且图像处理效果很好,但是……如何检测所有同时手势的结束,以便重置图像？

解决方法 一个简单的解决方案如计算当前正在处理的手势,并在所有这些手势结束时采取行动？

.h文件：

int handledGesturesCount;

.m文件：

- (ID)init {    (...)    handledGesturesCount = 0;}// gesture handlers - the code for -pinch: repeats for -pan: and -rotate:- (voID)pinch:(UIPinchGestureRecognizer *)recognizer {    if (recognizer.state == UIGestureRecognizerStateBegan) {        handledGesturesCount += 1;    } else if (recognizer.state == UIGestureRecognizerStateEnded ||               recognizer.state == UIGestureRecognizerStateCancelled ||               recognizer.state == UIGestureRecognizerStateFailed)    {        handledGesturesCount -= 1;        if (handledGesturesCount == 0) {            [self resetimage];        }    }}- (voID)pan:(UIPanGestureRecognizer *)recognizer {    if (recognizer.state == UIGestureRecognizerStateBegan) {        handledGesturesCount += 1;    } else if (recognizer.state == UIGestureRecognizerStateEnded ||               recognizer.state == UIGestureRecognizerStateCancelled ||               recognizer.state == UIGestureRecognizerStateFailed)    {        handledGesturesCount -= 1;        if (handledGesturesCount == 0) {            [self resetimage];        }    }}- (voID)rotate:(UIRotationGestureRecognizer *)recognizer {    if (recognizer.state == UIGestureRecognizerStateBegan) {        handledGesturesCount += 1;    } else if (recognizer.state == UIGestureRecognizerStateEnded ||               recognizer.state == UIGestureRecognizerStateCancelled ||               recognizer.state == UIGestureRecognizerStateFailed)    {        handledGesturesCount -= 1;        if (handledGesturesCount == 0) {            [self resetimage];        }    }}

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