点击时使 UIButton 文本变暗

Posted 2023-03-21

【中文标题】点击时使 UIButton 文本变暗

【英文标题】：Dim UIButton text when tapped

【发布时间】：2014-05-30 21:36:00

【问题描述】：

我正在使用自定义UIButtons，我想要做的是，当用户触摸按钮时，它会变暗或变成灰色，就像常规按钮一样。

我只是希望文本在用户抬起时暂时改变颜色，因为它会恢复到常规颜色。

我试过这段代码：

button.showsTouchWhenHighlighted = TRUE;

但这只是在它周围形成一个白色圆圈，这不是我想要的。 感谢您的帮助。

【问题讨论】：

对于自定义按钮，您需要手动处理。继承 UIButton 并在 touchesBegan 和 tochesEnd / touchesCancelled 中添加动画。

【参考方案1】：

我遇到的最简单的方法是：

[myButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[myButton setTitleColor:[UIColor greenColor] forState:UIControlStateHighlighted];

【参考方案2】：

您可以使用以下UIControlEvents：

UIControlEventTouchDown UIControlEventTouchUpInside UIControlEventTouchUpOutside

像这样适当地为它们分配目标操作方法：

 //when touch initiated
 [myButton addTarget:self
              action:@selector(buttonTouchStartAct:)
    forControlEvents:UIControlEventTouchDown];

 //on touch released outside button bounds
 [myButton addTarget:self
              action:@selector(buttonTouchEndAct:)
    forControlEvents:UIControlEventTouchUpOutside];

 //on touch released while still inside button bounds (most commonly used)
 [myButton addTarget:self
              action:@selector(buttonAct:)
    forControlEvents:UIControlEventTouchUpInside];

---

-(void)buttonTouchStartAct:(UIButton *)sender

    [sender.titleLabel setTextColor:[UIColor redColor]];


-(void)buttonTouchEndAct:(UIButton *)sender

    [sender.titleLabel setTextColor:[UIColor greenColor]];


-(void)buttonAct:(UIButton *)sender

    //touch ended in this case too
    [self buttonTouchEndAct:sender];

    //...
    //your main button logic
    //...

【参考方案3】：

 //when touch initiated
 [myButton addTarget:self
              action:@selector(buttonTouchStartAct:)
    forControlEvents:UIControlEventTouchDown];

 //on touch released outside button bounds
 [myButton addTarget:self
              action:@selector(buttonTouchEndAct:)
    forControlEvents:UIControlEventTouchUpOutside];

 //on touch released while still inside button bounds (most commonly used)
 [myButton addTarget:self
              action:@selector(buttonAct:)
    forControlEvents:UIControlEventTouchUpInside];

然后在方法内部改变按钮的颜色

【参考方案4】：

尝试像这样在单击按钮时更改标题标签的 alpha

- (IBAction)buttonClick:(id)sender 
    UIButton *button = sender;
    [UIView animateWithDuration:0.2 delay:0.0 options:UIViewAnimationOptionAllowUserInteraction|UIViewAnimationOptionCurveEaseInOut animations:^
    
        [button.titleLabel setAlpha:0.5];
     completion:^(BOOL finished)
    
        [button.titleLabel setAlpha:1];
    ];