Gesture(手势旋转图片，缩放图片，touch图片处理相关事件)

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- (void)viewDidLoad
{
    [super viewDidLoad];
   // Do any additional setup after loading the view, typically from a nib.
    UIImage *img = [UIImage imageNamed:@"iphone.png"];
    UIImageView *imageView = [[UIImageView alloc]initWithImage:img];
    imageView.frame = CGRectMake(100, 100, 200, 200);
   [self.view addSubview:imageView];

//重要！其中交换功能

    imageView.userInteractionEnabled = YES;


    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
    tapGestureRecognizer.numberOfTouchesRequired = 1;
    tapGestureRecognizer.numberOfTapsRequired = 1;
    [imageView addGestureRecognizer:tapGestureRecognizer];

    //添加拖动手势
    UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
    [imageView addGestureRecognizer:panGestureRecognizer];

    //添加捏合缩放手势
    UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)];
    [imageView addGestureRecognizer:pinchGestureRecognizer];


    //添加旋转手势
    UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotation:)];
    [imageView addGestureRecognizer:rotationGestureRecognizer];
}

#pragma mark - 单击手势
- (void)handleTap:(UITapGestureRecognizer *)recognizer
{
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"message" message:@"你单击了图片" delegate:nil cancelButtonTitle:@"yes" otherButtonTitles: nil];
    [alert show];

}

#pragma mark - 拖动手势
- (void)handlePan:(UIPanGestureRecognizer *)recognizer
{

    CGPoint translation = [recognizer translationInView:self.view];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
    [recognizer setTranslation:CGPointZero inView:self.view];


    //使用 CGAffineTransformMakeTranslation 函数创建一个仿射位移变换(affine translation transformation)。将被绘制到图形环境上的一切,到一个新的位置,而不需要修改你的绘图代码。
//    recognizer.view.transform = CGAffineTransformMakeTranslation(recognizer.view.center.x, recognizer.view.center.y);
}

#pragma mark - 双指捏合，模拟器上按住Option模拟
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer
{
    //transform为仿射变换可以用于平移、旋转、缩放变换路径或者图形上下文
    //CGAffineTransformScale为创建一个给定缩放比例的变换
    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);

    //重置
    recognizer.scale = 1;
}

- (void)handleRotation:(UIRotationGestureRecognizer *)recognizer
{
    //CGAffineTransformRotate创建一个给定角度旋转的变换
    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
    recognizer.rotation = 0;
}

@end

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