点击时调暗UIButton文本

Question

我正在使用自定义UIButton ，我想要做的就是当用户触摸按钮时它会变暗，或变成浅灰色，就像常规按钮一样。

我只是希望文本暂时改变颜色，当用户抬起那里时，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，这不是我正在寻找的。
谢谢您的帮助。

Answer 1

我遇到的最简单的方法是：

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

Answer 2

您可以使用以下UIControlEvents ：

• UIControlEventTouchDown
• UIControlEventTouchUpInside
• UIControlEventTouchUpOutside

适当地将目标操作方法分配给它们，如下所示：

 //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
    //...
}

Answer 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];

然后在方法内部更改按钮的颜色

Answer 4

尝试按下按钮点击更改标题标签的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];
    }];
}