UIGestureRecognizer

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UIGestureRecognizer

#pragma mark - 拖拽

- (void)addPan
{
   
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [
_imagView addGestureRecognizer:pan];
}
- (
void)pan:(UIPanGestureRecognizer *)pan
{
   
// 获取手指移动的位置
   
CGPoint trans = [pan translationInView:_imagView];
   
_imagView.transform = CGAffineTransformTranslate(_imagView.transform, trans.x, trans.y);
   
// 复位
    [pan
setTranslation:CGPointZero inView:_imagView];
}

#pragma mark - 放大、缩小
- (void)addPinch
{
   
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
   
// 设置代理的原因:想要同时支持多个手势
    pinch.
delegate = self;
    [
_imagView addGestureRecognizer:pinch];
}
- (
void)pinch:(UIPinchGestureRecognizer *)pinch
{
   
_imagView.transform = CGAffineTransformScale(_imagView.transform, pinch.scale, pinch.scale);
   
// 复位
    pinch.
scale = 1;
}

#pragma mark - 旋转
- (void)addRotation
{
   
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    rotation.
delegate = self;
    [
_imagView addGestureRecognizer:rotation];
}
- (
void)rotation:(UIRotationGestureRecognizer *)rotation
{
   
_imagView.transform = CGAffineTransformRotate(_imagView.transform, rotation.rotation);
   
// 复位
    rotation.
rotation = 0;
}

#pragma mark - 轻扫
- (void)addSwipe
{
   
// 一个手势只能识别一个方向
   
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    swipe.
direction = UISwipeGestureRecognizerDirectionRight;
    [
_imagView addGestureRecognizer:swipe];
}
- (
void)swipe:(UISwipeGestureRecognizer *)swipe
{
   
NSLog(@"swipe");
}

#pragma mark - 长按
- (void)addLongPress
{
   
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    [
_imagView addGestureRecognizer:longPress];
}
- (
void)longPress:(UILongPressGestureRecognizer *)longPress
{
   
// 根据状态执行事件
   
if (longPress.state == UIGestureRecognizerStateBegan) {
       
NSLog(@"longPress");
    }
}

#pragma mark - 点击
- (void)addTap
{

   
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
   
// 点按多少次才能触发手势
    tap.
numberOfTapsRequired = 2;
   
// 必须多少个手指触摸才能触发手势
//    tap.numberOfTouchesRequired = 2;
    tap.
delegate = self;
    [
_imagView addGestureRecognizer:tap];
}
- (void)tap:(UITapGestureRecognizer *)tap
{
   
NSLog(@"tap");
}

注意:
1.手势的触摸要取消Use Auto Layout。
2.在UISwipeGestureRecognizer(轻扫)手势中,一个手势只能识别一个方向。
3.如果想要支持多个手势,要遵守UIGestureRecognizerDelegate协议,实现下面这个方法,就可以支持多手势操作。
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    
return YES;
}

4.其中UIImageView要实现userInteractionEnabled。
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