iOS捏合手势（Pinch）

 UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewPinch:)];

pinch.delegate = self;

//设置属性 点击此次 1单击 2双击

//手势View 对象 添加给UIImageView

[imgView addGestureRecognizer:pinch];

[self.view addSubview:imgView];

#pragma mark - 点击手势触发事件

-(void)imageViewPinch:(UIPinchGestureRecognizer *)pinch

{

    NSLog(@"识别到了捏合手势");

    pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale,pinch.scale);

    pinch.scale = 1;

}

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