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UIGestureRecognizer

UIGestureRecognizer

#pragma mark -拖拽

- (void)addPan
{
   
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(pan:)];
    [
_imagViewaddGestureRecognizer:pan];
}
- (
void)pan:(UIPanGestureRecognizer*)pan
{
   
// 获取手指移动的位置
   
CGPoint trans = [pantranslationInView:_imagView];
   
_imagView.transform= CGAffineTransformTranslate(_imagView.transform, trans.x, trans.y);
   
// 复位
    [pan
setTranslation:CGPointZeroinView:_imagView];
}

#pragma mark -放大、缩小
- (void)addPinch
{
   
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizeralloc]initWithTarget:selfaction:@selector(pinch:)];
   
// 设置代理的原因:想要同时支持多个手势
    pinch.
delegate= self;
    [
_imagViewaddGestureRecognizer: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 = [[UIRotationGestureRecognizeralloc]initWithTarget:selfaction:@selector(rotation:)];
    rotation.
delegate= self;
    [
_imagViewaddGestureRecognizer: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 = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(swipe:)];
    swipe.
direction= UISwipeGestureRecognizerDirectionRight;
    [
_imagViewaddGestureRecognizer:swipe];
}
- (
void)swipe:(UISwipeGestureRecognizer*)swipe
{
   
NSLog(@"swipe");
}

#pragma mark -长按
- (void)addLongPress
{
   
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(longPress:)];
    [
_imagViewaddGestureRecognizer: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 = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@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;
    [
_imagViewaddGestureRecognizer: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。

UIGestureRecognizer