在 UIBarButtonItem 中切换自定义图像

Question

在过去的两天里，我一直在绞尽脑汁地寻找并尝试一些自己的解决方案。我通过 IB 放置了一个 UIBarButtonItem，并在顶部栏中放置了一个图像，作为静音/取消静音按钮。除了图像不变之外，一切正常。我使用了以下代码，它可以编译但没有改变

if( mute == YES ) {
    UIImage *unmuteImage = [UIImage imageNamed:@"audio-on.png"];
    [self.muteButton setImage:unmuteImage];
    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"muteKey"];
}
else {
    UIImage *muteImage = [UIImage imageNamed:@"audio-off.png"];
    [self.muteButton setImage:muteImage];
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"muteKey"];
}

Answer 1

我终于弄清楚了......只花了几天时间，但我太忙了，无法发布解决方案。我终于有时间了，很高兴发布我的解决方案。我有预感，除非 100% 以编程方式完成，否则这是行不通的，我是对的。这是我的问题的最终解决方案：

if(mute == YES)
{
    UIImage *image = [UIImage imageNamed:@"audio-off.png"];
    UIButton *myMuteButton = [UIButton buttonWithType:UIButtonTypeCustom];
    myMuteButton.bounds = CGRectMake( 0, 0, image.size.width, image.size.height );    
    [myMuteButton setImage:image forState:UIControlStateNormal];
    [myMuteButton addTarget:self action:@selector(mute) forControlEvents:UIControlEventTouchUpInside];    
    UIBarButtonItem *myMuteBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:myMuteButton];   
    navBar.leftBarButtonItem = myMuteBarButtonItem;
    [myMuteBarButtonItem release];
}
else
{
    UIImage *image = [UIImage imageNamed:@"audio-on.png"];
    UIButton *myUnmuteButton = [UIButton buttonWithType:UIButtonTypeCustom];
    myUnmuteButton.bounds = CGRectMake( 0, 0, image.size.width, image.size.height );    
    [myUnmuteButton setImage:image forState:UIControlStateNormal];
    [myUnmuteButton addTarget:self action:@selector(mute) forControlEvents:UIControlEventTouchUpInside];    
    UIBarButtonItem *myUnmuteBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:myUnmuteButton];
    navBar.leftBarButtonItem = myUnmuteBarButtonItem;
    [myUnmuteBarButtonItem release];
}

好消息是我终于完成了我的应用程序并将其提交到应用程序商店。希望一切顺利，我很期待！

Answer 2

Swift，

我围绕实例变量设置了我的变量，并用它来切换我的开关。我的导航栏中也有 3 个按钮。

private var activeStaff:Staff? {
    didSet {
        let image = (activeStaff == nil) ? UIImage(named: "active")! : UIImage(named: "notActive")!
        let button = UIBarButtonItem(image: image, style: .Plain, target: self, action: "activePressed:")

        if navigationItem.rightBarButtonItems?.count == 3 {
            navigationItem.rightBarButtonItems?.removeAtIndex(0)
        }

        navigationItem.rightBarButtonItems?.insert(button, atIndex: 0)
    }
}