ios - 按下按钮时更改标签

Question

我有一个button改变它被按下的图像，它从img1到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];
 }

Answer 1

尝试这个

- (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];
}

Answer 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像

[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];

在您的切换方法中只需执行

- (void)toggleImage:(UIButton *)button 
{
    button.selected = !button.selected;
}

Answer 3

将此添加到您的toggleImage方法中：

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