手势识别
1、点击手势
- (void)testTap
{
// 1.创建手势识别器对象
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
// 连续敲击2次,手势才能识别成功
tap.numberOfTapsRequired = 2;
tap.numberOfTouchesRequired = 2;
// 2.添加手势识别器对象到对应的view
[self.iconView addGestureRecognizer:tap];
// 3.添加监听方法(识别到了对应的收拾,就会调用监听方法)
[tap addTarget:self action:@selector(tapView)];
}
/**
* 当点击view的时候,会先调用这个方法
*/
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
CGPoint pos = [touch locationInView:touch.view];
if (pos.x <= self.iconView.frame.size.width * 0.5) {
return YES;
}
return NO;
}
/**
* 当点击view的时候,会先调上面的方法，然后再调下面的方法
*/
- (void)tapView
{
NSLog(@"-----tapView");
}
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeView)];
swipe.direction = UISwipeGestureRecognizerDirectionUp;
[self.redView addGestureRecognizer:swipe];
- (void)swipeView
{
NSLog(@"swipeView");
}
3、 长按手势
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] init];
[longPress addTarget:self action:@selector(longPressView)];
// 至少长按2秒
longPress.minimumPressDuration = 2;
// 在触发手势之前,50px范围内长按有效
longPress.allowableMovement = 50;
[self.redView addGestureRecognizer:longPress];
- (void)longPressView
{
NSLog(@"长按了红色的view");
}
4、 缩放手势(捏合手势)
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];pinch.delegate = self;
[self.iconView addGestureRecognizer:pinch];
- (void)pinchView:(UIPinchGestureRecognizer *)pinch
{
pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
pinch.scale = 1; // 还原缩放比例，
}
5、旋转手势
UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizeralloc] initWithTarget:self action:@selector(rotateView:)];
recognizer.delegate = self;
[self.iconView addGestureRecognizer:recognizer];
- (void)rotateView:(UIRotationGestureRecognizer *)recognizer
{
recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
recognizer.rotation = 0; // 这个很重要!!!!!
}
6、拖拽平移手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
[self.purpleView addGestureRecognizer:pan];
- (void)panView:(UIPanGestureRecognizer *)pan
{
switch (pan.state) {
case UIGestureRecognizerStateBegan: // 开始触发手势
break;
case UIGestureRecognizerStateEnded: // 手势结束
break;
default:
break;
}
// 1.在view上面挪动的距离
CGPoint translation = [pan translationInView:pan.view];
CGPoint center = pan.view.center;
center.x += translation.x;
center.y += translation.y;
pan.view.center = center;
// 2.清空移动的距离
[pan setTranslation:CGPointZero inView:pan.view];
}
7、同时允许多个手势
1->实现以下方法，让控制器可以同时识别多个手势
/**
* 是否允许多个手势识别器同时有效
* Simultaneously : 同时地
*/
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
2->遵守UIGestureRecognizerDelegate协议
3->哪几手势需要同时识别，则这每个手势都要设置代理
