UIGestureRecognizer 手势

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];

_imageView = [[UIImageView alloc]initWithFrame:CGRectMake((self.view.frame.size.width-150)/2, (self.view.frame.size.height-150)/2, 150, 150)];
_imageView.userInteractionEnabled = YES;//交互使能，允许界面交互
_imageView.image = [UIImage imageNamed:@"cat.png"];
[self.view addSubview:_imageView];

// 单击的 TapRecognizer
UITapGestureRecognizer *singleTap;
singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(SingleTap:)];
singleTap.numberOfTapsRequired = 1; //点击的次数 ＝1 单击

[_imageView addGestureRecognizer:singleTap];//给对象添加一个手势监测；

// 双击的 TapRecognizer
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(DoubleTap:)];
doubleTap.numberOfTapsRequired = 2; //点击的次数 ＝2 双击
[_imageView addGestureRecognizer:doubleTap];//给对象添加一个手势监测；

/*
1.双击手势确定监测失败才会触发单击手势的相应操作，否则双击时第一击时会响应单击事件
2.会造成单击时要判断是否是双击，调用单击会有所延时。属正常现象。
*/
[singleTap requireGestureRecognizerToFail:doubleTap];

//捏合缩放手势 Pinch
UIPinchGestureRecognizer *pinch;
pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)];
// [_imageView addGestureRecognizer:pinch];//添加到_imageView的时候，是要把手指放到_imageView操作
[self.view addGestureRecognizer:pinch];//是self的时候，操作整个view都可以捏合_imageView（在响应事件中操作）
pinch.delegate = self;


//旋转手势 Rotation
UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc]
initWithTarget:self
action:@selector(handleRotate:)];
[self.view addGestureRecognizer:rotateRecognizer];//是self的时候，操作整个view都可以捏合_imageView（在响应事件中操作）
rotateRecognizer.delegate = self;


//滑动手势 SwipeRecognizer
UISwipeGestureRecognizer *swipeRecognizer = [[UISwipeGestureRecognizer alloc]
initWithTarget:self
action:@selector(handleSwipe:)];
[self.view addGestureRecognizer:swipeRecognizer];//是self的时候，操作整个view都可以捏合_imageView（在响应事件中操作）
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;//操作为左滑
swipeRecognizer.delegate = self;


//拖动手势 PanRecognizer
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]
initWithTarget:self
action:@selector(handlePan:)];
[_imageView addGestureRecognizer:panRecognizer];//关键语句，添加一个手势监测；
panRecognizer.maximumNumberOfTouches = 1;
panRecognizer.delegate = self;

//长按手势 LongPressRecognizer
UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc]
initWithTarget:self
action:@selector(handlelongPress:)];
[_imageView addGestureRecognizer:longPressRecognizer];
longPressRecognizer.minimumPressDuration = 1.0f;//触发长按事件时间为：1.0秒
longPressRecognizer.delegate = self;

}

-(void)SingleTap:(UITapGestureRecognizer*)recognizer
{
//处理单击操作
NSLog(@"单击操作");
}

-(void)DoubleTap:(UITapGestureRecognizer*)recognizer
{
//处理双击操作
NSLog(@"双击操作");
}

- (void)handlePinch:(UIPinchGestureRecognizer*)recognizer
{
NSLog(@"缩放操作");//处理缩放操作
//对imageview缩放
_imageView.transform = CGAffineTransformScale(_imageView.transform, recognizer.scale, recognizer.scale);
//对self.view缩放，因为recognizer是添加在self.view上的
//recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
recognizer.scale = 1;
}

- (void)handleRotate:(UIRotationGestureRecognizer*) recognizer
{
NSLog(@"旋转操作");//处理旋转操作
//对imageview旋转
_imageView.transform = CGAffineTransformRotate(_imageView.transform, recognizer.rotation);
//对self.view旋转，因为recognizer是添加在self.view上的
// recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
recognizer.rotation = 0;
}

- (void)handleSwipe:(UISwipeGestureRecognizer*) recognizer
{
//处理滑动操作
if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"左滑滑动操作");
}else if(recognizer.direction==UISwipeGestureRecognizerDirectionRight){
NSLog(@"右滑滑动操作");
}
}

-(void)handlePan:(UIPanGestureRecognizer*)recognizer
{
NSLog(@"拖动操作");
//处理拖动操作,拖动是基于imageview，如果经过旋转，拖动方向也是相对imageview上下左右移动，而不是屏幕对上下左右
CGPoint translation = [recognizer translationInView:_imageView];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointZero inView:_imageView];
}

-(void)handlelongPress:(UILongPressGestureRecognizer*)recognizer
{
//处理长按操作,开始结束都会调用，所以长按1次会执行2次
if(recognizer.state == UIGestureRecognizerStateBegan){
NSLog(@"开始长按操作");
}else if(recognizer.state == UIGestureRecognizerStateEnded){
NSLog(@"结束长按操作");
}
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}