实现多个手势同时执行

本文介绍了如何在iOS中让Pinch和Rotation等手势同时被识别。通过重写UIGestureRecognizerDelegate方法`shouldRecognizeSimultaneouslyWithGestureRecognizer`并返回YES,可以实现多个手势并发执行。

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  ios开发中,默认是在同一时间只能有一个手势被执行,要实现多个手势同时进行,须实现UIGestureRecognizerDelegate,并重写函数

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


以Pinch和Rotation手势为例,首先是添加手势:

        UIGestureRecognizer *recognizer;
	recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotationFrom:)];
	recognizer.cancelsTouchesInView = NO;
	recognizer.delegate = self;
	[self.view addGestureRecognizer:recognizer];
	[recognizer release];
	
	UIGestureRecognizer *recognizer2;
	recognizer2 = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
	recognizer2.cancelsTouchesInView = NO;
	recognizer2.delegate = self;
	[self.view addGestureRecognizer:recognizer2];
	[recognizer2 release];

接着重写上面提到的函数,只需返回YES即可。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
   shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
	return YES;
}


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