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。