代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.title=@"拍照动画";
    
}
//点击任何处，弹出动画
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CATransition *shutterAnimation = [CATransition animation];
    shutterAnimation.delegate = self;
    shutterAnimation.duration = 0.5f;
    shutterAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    shutterAnimation.type = @"cameraIris";
    shutterAnimation.subtype = @"cameraIris";
    [self.view.layer addAnimation:shutterAnimation forKey:@"cameraIris"];

}