Question

我创建了一个自定义控件，该控件直接从类UIView派生。现在，如果用户点击视图的特定部分，我想执行一个操作。因此，我已经覆盖了方法touchesBegan，touchesEnded和touchesCancelled。问题是，如果我仅点击显示，就永远不会调用方法touchesEnded。方法touchesCancelled被称为。 touchesEnded仅在我执行某些手势（滑动，移动...）时才会被调用。

我是否需要配置视图以启用点击手势？

我的代码：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"touchesBegan");
    self->touchDown = YES;
    [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
        self.value = 1.0;
    } completion:nil];
}

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if (self->touchDown) {
        NSLog(@"touchesEnded");
        self->touchDown = NO;
        [UIView animateWithDuration:0.3 animations:^{
            self.value = 0.0;
        } completion:nil];
    }
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    if (self->touchDown) {
        NSLog(@"touchesCancelled");
        self->touchDown = NO;
        [UIView animateWithDuration:0.3 animations:^{
            self.value = 0.5;
        } completion:nil];
    }
}

对于点击手势，我得到：

2018-07-17 09：55：20.994645 + 0200 iOS测试[33049：2763212] touchesBegan

2018-07-17 09：55：21.092409 + 0200 iOS测试[33049：2763212] touchesCancelled

Answer 1

您是否尝试过在视图中设置recognizer.cancelsTouchesInView = NO;

一个布尔值，影响识别手势后是否将触摸传递给视图。

Answer 2

你应该经历这个。

根据Apple文档，

https://developer.apple.com/documentation/uikit/uigesturerecognizer?changes=_4&language=objc

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
   // Sent to the gesture recognizer when one or more fingers touch down in the associated view.
}


- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 
{
    //Sent to the gesture recognizer when one or more fingers move in the associated view.
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{
   //Sent to the gesture recognizer when one or more fingers lift from the associated view.
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
 {
   //Sent to the gesture recognizer when a system event (such as an incoming phone call) cancels a touch event.
 }

如何使用touchesBegan和touchesEnded检测点击手势

2 个答案: