试图将 UILabel 放在自定义 UIAlertView 中的 UIButton 之上

Posted 2023-03-21

【中文标题】试图将 UILabel 放在自定义 UIAlertView 中的 UIButton 之上

【英文标题】：Trying to place UILabel on top of UIButton in a custom UIAlertView

【发布时间】：2013-06-27 06:39:17

【问题描述】：

我要做的是在UIButton 上放置一个UILabel。 UIButton 有一个图像作为背景，结果是我看不到UIButton 上的正常文本，因此我想将UILabel 放在它上面。

我的代码是：

NAlertView *customAlert = [[NAlertView alloc] initWithTitle:@"title" message:@"message" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:@"cancel", nil];
[customAlert show];

NAlertView.m：

- (void)layoutSubviews

    for (id obj in self.subviews) //Search in all sub views
    

        if ([obj isKindOfClass:[UIImageView class]]) // Override UIImageView (Background)
         
            UIImageView *imageView = obj;
            [imageView setImage:[UIImage imageNamed:@"CustomAlertView"]];
            [imageView setAlpha:0.7];
            [imageView sizeToFit];
        

        if ([obj isKindOfClass:[UILabel class]]) // Override UILabel (Title, Text)
        
            UILabel *label = (UILabel*)obj;

            label.backgroundColor = [UIColor clearColor];
            label.textColor = [UIColor whiteColor];
            label.shadowColor = [UIColor clearColor];
        

        if ([obj isKindOfClass:[UIButton class]]) // Override the UIButton
        
            UIButton *button = (UIButton*)obj;

            CGRect buttonFrame = button.frame; // Change UIButton size
            buttonFrame.size = CGSizeMake(127, 35);
            CGFloat newYPos = buttonFrame.origin.y + 9; // Change UIButton position
            buttonFrame.origin.y = newYPos;

            button.frame = buttonFrame;

            [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
            [button setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];

            switch (button.tag)
            
                case kFIRST_BUTTON:
                

                    [button setImage:[UIImage imageNamed:@"short_button_gold_off.png"] forState:UIControlStateNormal];
                    [button setImage:[UIImage imageNamed:@"short_button_gold_on.png"] forState:UIControlStateHighlighted];
                
                    break;
                case kSECOND_BUTTON:
                
                    [button setImage:[UIImage imageNamed:@"short_button_black_off.png"] forState:UIControlStateNormal];
                    [button setImage:[UIImage imageNamed:@"short_button_black_on.png"] forState:UIControlStateHighlighted];
                
                    break;
            
        
    

    [self updateConstraints];

结果：

【参考方案1】：

也就是说你只想在 UIButton 上添加 Title？

试试这个 -

  [button setBackgroundImage:[UIImage imageNamed:@"short_button_gold_off.png"] forState:UIControlStateNormal];
  [button setTitle:@"Title" forState:UIControlStateNormal];

【讨论】：

不需要'setTitle'，因为它继承自定义本身。

你说的“不需要'setTitle'，因为它继承自定义本身？”是什么意思？

当你这样做时：NAlertView *customAlert = [[NAlertView alloc] initWithTitle:@"title" message:@"message" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:@"cancel", nil ]; [customAlert 显示]; ---> 'initWithTitle' 自己设置标题，所以不需要设置标题。

【参考方案2】：

替换

[button setImage:[UIImage imageNamed:@"short_button_gold_off.png"] forState:UIControlStateNormal];

到

[button setBackgroundImage:[UIImage imageNamed:@"short_button_gold_off.png"] forState:UIControlStateNormal];

改变所有这些可能性。

并使用以下方法更改按钮的文本

[button setTitle:@"text" forState:UIControlStateNormal];

希望对你有帮助。