第一步：声明手势对象，并加入你想要作用的view上
// 放大缩小手势
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc]
initWithTarget:self action:@selector(scale:)];
[pinchRecognizer setDelegate:self];
[self.view addGestureRecognizer:pinchRecognizer];
[pinchRecognizer release];
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