如何使用 touchesBegan 和 touchesEnded 检测点击手势

Question

我创建了一个直接派生自 class UIView 的自定义控件。现在我想在用户点击我视图的特定部分时执行一个操作。所以我覆盖了方法 touchesBegan、touchesEnded 和 touchesCancelled。问题是，如果我只是点击显示屏，方法 touchesEnded 永远不会被调用。方法 touchesCancelled 被称为它的替代品。 touchesEnded 仅当我执行某些手势（滑动、移动……）时才会被调用。

我是否需要配置我的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 Test[33049:2763212] touchesBegan

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

Answer 1

你应该完成这个。

来自 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.
 }

Answer 2

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

A Boolean value affecting whether touches are delivered to a view when a gesture is recognized.

如何使用 touchesBegan 和 touchesEnded 检测点击手势

How to detect a tap gesture using touchesBegan and touchesEnded

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