How to detect the end of the gesture? (IOS)

int handledGesturesCount;

- (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 (recog nizer.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];
 }
 }
}

In my application, I also use UIPinchGestureRecognizer, UIRotationGestu reRecognizer and UIPanGestureRecognizer to zoom, rotate and move the image.

Method gestureRecognizer: shouldRecognizeSimultaneouslyWithGestureRecognizer: always returns YES and the image processing effect is very good, but… how to detect the end of all simultaneous gestures in order to reset image?

A simple solution such as counting the gestures currently being processed, and taking action at the end of all these gestures?

.h file:

int handledGesturesCount;

.m file:

< /p>

- (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 {< br /> if (recognizer.state == UIGestureRecognizerStateBegan) {
 handledGesturesCount += 1;
} else if (recognizer.state == UIGestureRecognizerStateEnded ||
 recognizer.state == UIGestureRecognizerStateCancelled || 
 recognizer.state == UIGestureRecognizerStateFailed)
 {
 handledGesturesCount -= 1;
 if (handledGesturesCount == 0) {
 [self resetImage];
 }
 }
}