iOS手势识别器
UIGestureRecognizer
UIGestureRecognizer类,用于检测、识别用户使用设备时所用的手势.它是一个抽象类,定义了所有手势的基本行为.以下是UIGestureRecognizer子类,用于处理具体的用户手势行为:
UITapGestureRecognizer // 1.单击
UILongPressGestureRecognizer // 3.长按
UISwipeGestureRecognizer // 4.轻扫
UIPanGestureRecognizer // 5.移动
UIRotationGestureRecognizer // 6.旋转
UIPinchGestureRecognizer // 7.捏合
创建手势:
// 1.单击
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
[imgView addGestureRecognizer:tap];
// 2.双击
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapAction:)];
doubleTap.numberOfTapsRequired = 2;
[imgView addGestureRecognizer:doubleTap];
// 双击失败才单击
[tap requireGestureRecognizerToFail:doubleTap];
// 3.长按
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
//设置最短时间
longPress.minimumPressDuration = 1;
[imgView addGestureRecognizer:longPress];
// 4.轻扫
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
// 设置轻扫方向
[swipe setDirection:UISwipeGestureRecognizerDirectionRight];
[imgView addGestureRecognizer:swipe];
// 5.移动
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
[imgView addGestureRecognizer:pan];
// 轻扫失败才移动
[pan requireGestureRecognizerToFail:swipe];
// 6.旋转
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
[imgView addGestureRecognizer:rotation];
// 7.捏合
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
[imgView addGestureRecognizer:pinch];
手势触发事件：
GestureAction:
-(void)longPressAction:(UILongPressGestureRecognizer *)longPress
{
if (longPress.state == UIGestureRecognizerStateBegan) {
NSLog(@"长按开始");
}else if (longPress.state == UIGestureRecognizerStateEnded){
NSLog(@"长按结束");
}
}
- (void)panAction:(UIPanGestureRecognizer *)pan {
//手指所在的坐标
CGPoint point = [pan locationInView:self.view];
_view.center = point;
}
- (void)rotationAction:(UIRotationGestureRecognizer *)rotation
{
if (rotation.state == UIGestureRecognizerStateChanged) {
//取到弧度
CGFloat angle = rotation.rotation;
//正在旋转
rotation.view.transform = CGAffineTransformMakeRotation(angle);
} else if (rotation.state == UIGestureRecognizerStateEnded) {
//还原
[UIView animateWithDuration:.5 animations:^{
rotation.view.transform = CGAffineTransformIdentity;
}];
}
}
- (void)pinchAction:(UIPinchGestureRecognizer *)pinch
{
if (pinch.state == UIGestureRecognizerStateChanged) {
// 取到缩放比率
CGFloat scale = pinch.scale;
// 缩放
pinch.view.transform = CGAffineTransformMakeScale(scale, scale);
} else if (pinch.state == UIGestureRecognizerStateEnded) {
[UIView animateWithDuration:.5 animations:^{
pinch.view.transform = CGAffineTransformIdentity;
}];
}
}
Motion 摇晃手势
//让当前对象成为第一响应者
- (BOOL)canBecomeFirstResponder
{
return YES;
}
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
NSLog(@"摇一摇开始");
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
NSLog(@"摇一摇结束");
}
