UIButton：多个按钮 - 如何检测事件并找到点击了哪个按钮”

Posted 2023-02-26

【中文标题】UIButton：多个按钮 - 如何检测事件并找到点击了哪个按钮”

【英文标题】：UIButton: multiple buttons - how to detect event and find which button was tapped"

【发布时间】：2013-05-27 00:51:11

【问题描述】：

如何检测哪个 UIButton 被点击：

-(void) topScorer 

    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
    [button1 addTarget:self
                action:@selector(buttonClicked:)
     forControlEvents:UIControlEventTouchDown];
    [button1 setTitle:@"Button1" forState:UIControlStateNormal];
    button1.frame = CGRectMake(16, self.view.bounds.size.height*0.6, 60, 60);
    UIImage *img1 = [UIImage imageNamed:@"img1.png"];
    button1.layer.cornerRadius = 10;
    button1.layer.masksToBounds = YES;
    [button1 setImage:img1 forState:UIScrollViewDecelerationRateNormal];
    button1.tag = 1;
    [self.view addSubview:button1];

    UIButton *button2 = [UIButton buttonWithType:UIButtonTypeCustom];
    [button2 addTarget:self
            action:@selector(buttonClicked:)
      forControlEvents:UIControlEventTouchDown];
     [button2 setTitle:@"Button2" forState:UIControlStateNormal];
     button2.frame = CGRectMake(92, self.view.bounds.size.height*0.6, 60, 60);
     UIImage *img2 = [UIImage imageNamed:@"img2.png"];
     button2.layer.cornerRadius = 10;
     button2.layer.masksToBounds = YES;
     [button2 setImage:img2 forState:UIScrollViewDecelerationRateNormal];
     button2.tag = 2;
     [self.view addSubview:button2];



-(void) buttonClicked: (id)sender 

    // How can I detect here which button is tapped?
    // For Example, I want to do this:

    // if button1 is pressed, do something
    // if button 2 is pressed, do another thing

【参考方案1】：

将您的发件人转换为 UIButton 并比较标签值。

UIButton *button = (UIButton *)sender;

if (button.tag == 1) 

 else 

【讨论】：

一如既往，完全忘记了类型转换：D，谢谢Jean

这是我通常这样做的方式，我要补充一点，您应该为标签创建一个枚举并将其与按钮标签进行比较

您可以将方法声明为：- (void)buttonClicked:(UIButton *)button ，而不是强制转换 id 参数 sender。

嗨 rmaddy，我喜欢你的方法。这里的问题是我完全忘记了类型转换，它并没有出现在我的脑海中。所有，建议看起来很棒，谢谢大家。

【参考方案2】：

将按钮存储在视图控制器的属性中，然后检查该属性：

@property (nonatomic, weak) UIButton *buttonOne;

- (void)buttonTapped:(id)sender 
    if (sender == buttonOne) 
        // button one was tapped
    

或者简单地为每个按钮分配不同的选择器。

[buttonOne addTarget:self
            action:@selector(buttonOneTapped:)
 forControlEvents:UIControlEventTouchUp];
[buttonTwo addTarget:self
            action:@selector(buttonTwoTapped:)
 forControlEvents:UIControlEventTouchUp];

【讨论】：

谢谢 Stepan，我才意识到我是如何忽略了类型转换的 :-)