UIGestureRecognizer

最新推荐文章于 2019-01-09 14:09:33 发布

原创最新推荐文章于 2019-01-09 14:09:33 发布 · 1.4k 阅读

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#UIGestureRecognizer

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本文介绍了UIKit中的手势识别功能，包括点击、捏合、清扫、滑动、旋转和长按等六种常用的手势识别器，并提供了具体的实现代码示例。

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UIRespond中的touchbegin函数的touch变量我们可以得到触摸的每个点的位置信息，但是我们不能很直接地判断出用户是在点击还是捏合或者滑动，

UIKit中包含了UIGestureRecognizer类，用于检测发生在设备中的手势。UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，包含下面一些子类用于处理具体的手势：

第一、点击手势UITapGestureRecognizer (任意次数的拍击)

    UITapGestureRecognizer *tap=[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)] autorelease];
    [self.view addGestureRecognizer:tap];
    
    UITapGestureRecognizer *doubleTap=[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)] autorelease];
    doubleTap.numberOfTapsRequired=2;
    [self.view addGestureRecognizer:doubleTap];

    //区别单击、双击手势
    [tap requireGestureRecognizerToFail:doubleTap];

第二、捏合手势UIPinchGestureRecognizer

    UIPinchGestureRecognizer  *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
    [self.view addGestureRecognizer:pinch];

第三、清扫UIPanGestureRecognizer

UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
   [self.view addGestureRecognizer:panGesture];

第四、滑动UISwipeGestureRecognizer (以任意方向)

    UISwipeGestureRecognizer *swipeGesture=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
    swipeGesture.direction=UISwipeGestureRecognizerDirectionUp;
    [self.view addGestureRecognizer:swipeGesture];

第五、旋转UIRotationGestureRecognizer (手指朝相反方向移动)

    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
    [self.view addGestureRecognizer:rotation];

第六、长按UILongPressGestureRecognizer

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
    longPress.minimumPressDuration = 2;
    [self.view addGestureRecognizer:longPress];

- (void)longPressAction:(UILongPressGestureRecognizer *)longPress {
    if (longPress.state == UIGestureRecognizerStateEnded) {
        return;
    }
    NSLog(@"长按");
}