实现多个手势同时执行

最新推荐文章于 2020-06-10 09:07:37 发布

beyondzoro

最新推荐文章于 2020-06-10 09:07:37 发布

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分类专栏： ios开发文章标签： action ios

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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;
}