Question

我想根据网络服务响应更改按钮背景图片。如果作为响应我将未读消息设置为true，则图像将不同，如果没有未读消息，则图像将不同。我得到了很好的响应，但无法更改按钮的背景图像。

这是我正在使用的代码段

if(unread>0){
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal];
}
else{
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"read.png"] forState:UIControlStateNormal];
}

Answer 1

如果你看一下，解决方案可以非常简单。保留全局UIButton而不是本地UIButton。这有助于，当Web请求返回响应时，按钮需要存在于范围内，而不是从内存中删除。

所以使用，

self.myButton = [UIButton buttonWithType:UIButtonTypeCustom];

[self.myButton setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal];

或

[self.myButton setImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal];

并且，如果您检查点击按钮，请按照步骤：

-(IBAction)checkForMsgCount: (id)sender { UIButton *buttonObj = (UIButton*)sender; [buttonObj setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal]; }

这会更改背景图像，对于响应该功能的按钮。

Answer 2

[YourBtn setImage:[UIImage imageNamed:@"your.png"] forState:UIControlStateNormal];

请试试。

如果你真的在你的照片中有这些照片的话，你也可以尝试一下吗？

        NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
        NSString *imagePath = [[NSString alloc] initWithFormat:@"%s/yourButton.png", [bundlePath  UTF8String]];


if ([[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
    NSLog(@"image exists");
}
else{
    NSlog(@"image Does Not Exist");
      }

Answer 3

请尝试以下代码

if(unread>0){
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal];
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState :UIControlStateSelected];
}
else{
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"read.png"] forState:UIControlStateNormal];
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"read.png"] forState :UIControlStateSelected];
}

Answer 4

首先检查按钮的IBOutlet连接：）

在从Web服务获取数据后设置代码，即获取unread

的值后

if(unread>0){
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal];
}
else{
    [badgeTitle setBackgroundImage:[UIImage imageNamed:@"read.png"] forState:UIControlStateNormal];
}

Answer 5

[badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal|UIControlStateSelected];

您是否正在添加UIControlStateNormal或UIControlStateSelected

的按钮图片

尝试

[badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] forState:UIControlStateNormal];

查找图像是否存在并正确添加到包中且名称是否正确

Answer 6

将UIControlStateNormal和UIControlStateSelected的背景图像设置为单独的行。

if(unread>0){

   [badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] UIControlStateNormal];

   [badgeTitle setBackgroundImage:[UIImage imageNamed:@"unread.png"] UIControlStateSelected];
} else {

   [badgeTitle setBackgroundImage:[UIImage imageNamed:@"read.png"] UIControlStateNormal];

   [badgeTitle setBackgroundImage:[UIImage imageNamed:@"read.png"] UIControlStateSelected];
}

Answer 7

UIButton *btn = [[UIButton alloc]init];
    btn.frame = CGRectMake(50, 50, 100, 50);
    [btn setTitle:@"ok" forState:UIControlStateNormal];
    [btn setBackgroundImage:[UIImage imageNamed:@"icon.png"] forState:UIControlStateNormal];
    btn.backgroundColor=[UIColor blueColor];

我希望这适合你......

Answer 8

设置背景图片后

[badgeTitle setNeedsLayout];

UIButton背景图片没有变化

8 个答案: