UIPinchGestureRecognizer的用法

gistfile1.m

-(void)initUIPinchGestureRecognizer{
       UIPinchGestureRecognizer *pinchGestureRecognizer=[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector:(pinchHandle:)];
       [self.view addGestureRecognizer:pinchGestureRecognizer];
}

-(void)pinchHandle:(UIPinchGestureRecognizer*)sender{
     CGFloat scale = sender.scale;//缩放比例
}