按下按钮时更改标签

Posted 2023-03-21

【中文标题】按下按钮时更改标签

【英文标题】：Change label when a button has been pressed

【发布时间】：2013-09-17 16:17:54

【问题描述】：

我有一个button，它改变了它被按下的图像，它从img1变为img2。我现在还希望在按下某个按钮时更改文本。所以它从“你好”开始，然后按下它变成“再见”。

这是我目前的代码：

- (void)toggleImage:(UIButton *)btn1 
    self.btn1ImageName = ([self.btn1ImageName isEqualToString:@"greypad.png"]) ? @"greenpad.png" : @"greypad.png";
    [btn1 setImage:[UIImage imageNamed:self.btn1ImageName] forState:UIControlStateNormal];

ViewDidLoad：

[self addLabel];
self.btn1ImageName = @"greypad.png";
btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
[btn1 setFrame:CGRectMake(46, 67, 48, 48)];
[btn1 setImage:[UIImage imageNamed:self.btn1ImageName] forState:UIControlStateNormal];
[btn1 addTarget:self action:@selector(toggleImage:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn1];

标签？

 -(void)addLabel
        UILabel *aLabel = [[UILabel alloc]initWithFrame: CGRectMake(20, 200, 280, 80)];
        aLabel.numberOfLines = 0;
        aLabel.textColor = [UIColor blueColor];
        aLabel.backgroundColor = [UIColor clearColor];
        aLabel.text = @"hello";
        [self.view addSubview:aLabel];
 

【参考方案1】：

试试这个

- (void)toggleImage:(UIButton *)btn1 
   self.btn1ImageName = ([self.btn1ImageName isEqualToString:@"greypad.png"]) ? @"greenpad.png" : @"greypad.png";
   self.titleStr = ([self.titleStr isEqualToString:@"hello"]) ? @"goodbye" : @"hello";
   [btn1 setImage:[UIImage imageNamed:self.btn1ImageName] forState:UIControlStateNormal];
   [btn1 setTitle:self.titleStr forState:UIControlStateNormal];

【参考方案2】：

我会推荐一种不同的方法：

设置按钮时，为不同的状态设置不同的标题和图片

[btn1 setTitle:@"hello" forState: UIControlStateNormal];
[btn1 setTitle:@"goodbye" forState: UIControlStateSelected];
[btn1 setImage:[UIImage imageNamed:@"greypad.png"] forState:UIControlStateNormal];
[btn1 setImage:[UIImage imageNamed:@"greenpad.png"] forState:UIControlStateSelected];

而在您的切换方法中，只需这样做

- (void)toggleImage:(UIButton *)button 

    button.selected = !button.selected;

【参考方案3】：

将此添加到您的toggleImage 方法：

[bt1 setTitle:@"goodbye" forState: UIControlStateNormal];