Question

我想用特定的视图控制器更改状态栏颜色。

根据StackOverFlow的答案，我实现了它。

有问题，在iPhone上切换应用时，我设置的颜色会消失，会回到初始状态。

没关系。请注意状态栏。

不行。请注意状态栏。

我无法弄明白。我试过的代码：

设置statusBar.backgroundColor，

UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) {
     statusBar.backgroundColor = [UIColor redColor ];
}

2. 将子视图插入statusBar。

 UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
 UIView * backgroundColorView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 375, 20) ];
 backgroundColorView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
 backgroundColorView.backgroundColor = [UIColor redColor ];
 [statusBar.subviews.firstObject insertSubview: backgroundColorView atIndex:0];

3. 也就是插入图层（CALayer）。

我试图用断点来分析它。

- 当应用处于有效状态时，双击“主页”按钮切换应用，该方法不会被称为- (void)viewWillDisappear:(BOOL)animated。这让我有些困惑。

- 我尝试在应用程序的方法- (void)applicationWillResignActive:(UIApplication *)application中更改状态栏的背景颜色，它不起作用。我不知道为什么。

来自Github的源代码，通过运行时确定。我的公司不喜欢使用运行时。

还有其他方式没有运行时吗？

而且我不知道运行时如何与iPhone的切换应用模式进行交互。

主要问题是解决它没有运行时。欢迎提供更多解释。我觉得很容易，我想念什么？

非常感谢你的进步。

Answer 1

Answer for Swift 4:

And it fits the situation of viewControllers managed by navigationViewController

class ViewController: UIViewController {

    let statusBarBgView = { () -> UIView in
        let statusBarWindow: UIView = UIApplication.shared.value(forKey: "statusBarWindow") as! UIView
        let statusBarBgView = UIView(frame: (statusBarWindow.statusBar?.bounds)!)
        return statusBarBgView
    }()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        UIApplication.shared.statusBarStyle = .lightContent
        let navigationBar = self.navigationController?.navigationBar
        self.statusBarBgView.backgroundColor = UIColor.red
        navigationBar?.superview?.insertSubview(self.statusBarBgView, aboveSubview: navigationBar!)
    }


    override func viewWillDisappear(_ animated: Bool) {

        self.statusBarBgView.removeFromSuperview()
        super.viewWillDisappear(animated)
    }

}

extension UIView {
    var statusBar: UIView? {
        return value(forKey: "statusBar") as? UIView
    }
}

The Answer Of Objective-C version:

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear: animated];
    [UIApplication sharedApplication].statusBarStyle=UIStatusBarStyleLightContent;
    UINavigationBar *navigationBar = self.navigationController.navigationBar;
    UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
    self.statusBarBgView = [[UIView alloc ] initWithFrame: statusBar.bounds ];
    self.statusBarBgView.backgroundColor = [UIColor redColor ];
    [navigationBar.superview insertSubview: self.statusBarBgView aboveSubview: navigationBar];
}

- (void)viewWillDisappear:(BOOL)animated {
    [self.statusBarBgView removeFromSuperview ];
    [super viewWillDisappear:animated];
}

The status bar which shows the OS infos，is UIWindow ,controlled by the OS when in the app switcher window.

UIView *statusBar = [[[UIApplication sharedApplication] 
valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];

So it's OK to adjust the background color of the status bar position by changing the View , when in the app switcher window.

Answer 2

根据先前的答案进行了修改：

struct Utility {
    static var statusBarBgView = { () -> UIView in
        let statusBarBgView = UIView(frame: UIApplication.shared.statusBarFrame)
        return statusBarBgView
    }()
}

extension UIViewController {

    func setupStatusBar(statusBarBgView: inout UIView) {
        UIApplication.shared.statusBarStyle = .lightContent
        statusBarBgView.backgroundColor = .red
        let navigationBar = self.navigationController?.navigationBar
        UIApplication.shared.keyWindow!.insertSubview(statusBarBgView, aboveSubview: navigationBar!)
    }
}

// Usage:
self.setupStatusBar(statusBarBgView: &Utility.statusBarBgView)

在iPhone上切换应用程序时更改状态栏颜色的问题

2 个答案: