ios - 按下按钮时更改标签

Question

我有一个button，它可以更改已按下的图像，它从img1变为img2。我现在还希望在按下特定按钮时更改文本。因此，它从“hello”开始，然后在按下时变为“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];
}