Question

过去两天我一直在寻找并尝试一些自己的解决方案。我通过IB放置了一个UIBarButtonItem，顶部栏中有一个图像作为静音/取消静音按钮。一切正常，但图像不会改变。我使用了以下代码，它编译但没有变化

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

我终于想通了......只花了几天但是我太忙了，不能发布一个解决方案。我终于有时间，很乐意发布我的解决方案。我有一种预感，除非以编程方式100％完成，否则这将无法工作，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并将其提交到应用商店。希望一切顺利，我期待着它！

Answer 2

夫特，

我设置了一个实例var，并使用它来切换我的开关。我的导航栏中还有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)
    }
}

在UIBarButtonItem中切换自定义图像

2 个答案: