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所以我正在使用这两个函数更改按钮的图像和 UIImageView 的图像：

- (IBAction)changeButton:(id)sender {


    //switch image to group if it is a badge. switch image to badge if it is a group.

    if([[properties objectForKey:@"current_item"] isEqualToString:@"badge"]){
        NSLog(@"reaching badge");
        UIImage *imageToSet = [UIImage imageNamed:current_group_image];
        [changeButtonOutlet.imageView setImage:imageToSet];
        [properties setObject:@"group" forKey:@"current_item"];
    } else {
        if([[properties objectForKey:@"current_item"] isEqualToString:@"group"]){
            NSLog(@"reaching group");
            UIImage *imageToSet = [UIImage imageNamed:current_badge_image];
            [changeButtonOutlet.imageView setImage:imageToSet];         
            [properties setObject:@"badge" forKey:@"current_item"];

        } 
    }

    [self switchBadgeImage];
}

-(void)switchBadgeImage{
    if([[properties objectForKey:@"current_item"] isEqualToString:@"badge"]){
        [badgeImageView setImage:[UIImage imageNamed:current_badge_image ]];
    } else {
    if([[properties objectForKey:@"current_item"] isEqualToString:@"group"]){
        [badgeImageView setImage:[UIImage imageNamed:current_group_image ]];    
    }
    }

}

但是图像不更新。如果我向 changeButton IBAction 发送垃圾邮件，有时我可以很快看到图像发生变化，但它总是会弹回默认图像（仅用于按钮）。

这是我反复按下按钮时控制台日志告诉我的内容：

2012-08-24 12:20:52.414 MyApp[1448:707] reaching group
2012-08-24 12:20:52.559 MyApp[1448:707] reaching badge
2012-08-24 12:20:52.687 MyApp[1448:707] reaching group
2012-08-24 12:20:52.846 MyApp[1448:707] reaching badge
2012-08-24 12:20:52.976 MyApp[1448:707] reaching group
2012-08-24 12:20:53.117 MyApp[1448:707] reaching badge
2012-08-24 12:20:53.262 MyApp[1448:707] reaching group
2012-08-24 12:20:53.348 MyApp[1448:707] reaching badge

我究竟做错了什么？多谢你们！

编辑：修复它！这是更新的代码：

-(void)switchBadgeImage{ NSLog(@"当前组图像：%@", current_group_image); NSLog(@"当前徽章图片：%@", current_badge_image);

current_item = [properties objectForKey:@"current_item"];

if([current_item isEqualToString:@"badge"]){
    NSLog(@"current item is equal to badge");
    [badgeImage setImage:[UIImage imageNamed:current_badge_image ]];
} else {
    if([current_item isEqualToString:@"group"]){
         NSLog(@"current item is equal to group");
        [badgeImage setImage:[UIImage imageNamed:current_group_image ]];    
    }
}

}

- (IBAction)changeButton:(id)sender {

    //switch image to group if it is a badge. switch image to badge if it is a group.

    if([[properties objectForKey:@"current_item"] isEqualToString:@"badge"]){
        NSLog(@"reaching badge");
        UIImage *imageToSet = [UIImage imageNamed:current_badge_image];
        [changeButtonOutlet setImage:imageToSet forState:UIControlStateNormal];
        [properties setObject:@"group" forKey:@"current_item"];
        [properties synchronize];
    } else {
        if([[properties objectForKey:@"current_item"] isEqualToString:@"group"]){
            NSLog(@"reaching group");
            UIImage *imageToSet = [UIImage imageNamed:current_group_image];
            [changeButtonOutlet setImage:imageToSet forState:UIControlStateNormal];
            [properties setObject:@"badge" forKey:@"current_item"];
            [properties synchronize];
        } 
    }

    [self switchBadgeImage];


}

实际上有一些问题。首先，我以错误的方式切换图像。其次，我没有同步 UserDefaults。将当前项目保存到 UserDefaults 后，我也没有更新 current_item 变量。

感谢所有的帮助，如此之快！

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2 回答 2

3 
UIImage *image = [UIImage imageNamed:@"image.png"];
[changeButtonOutlet setImage:image forState:UIControlStateNormal];

试试这个，我知道你需要为那个按钮设置状态。此代码将设置图像及其不和背景。如果还有其他东西，请告诉我。

于 2012-08-24T11:41:35.353 回答
1

要为 设置图像UIButton，您必须指定UIControlState要使用的图像。该imageView属性不是用于设置背景图像，而是用于设置configure the appearance and behavior of the button’s view.

设置图像的正确方法是

[changeButtonOutlet setImage:imageToSet forState:UIControlStateNormal];

此处列出了不同的控制状态及其应用。

于 2012-08-24T11:34:14.050 回答