How can I detect UIStatusBar hide and show?

问题

I'm trying to detect hidden and show of iPhone's UIStatusBar but failed. Are there any solution can help me, like KVO or something else?

回答1:

You can observe the statusBarHidden property of the shared UIApplication instance.

Simple example:

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    // Do something here...
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[UIApplication sharedApplication] addObserver:self forKeyPath:@"statusBarHidden" options:NSKeyValueObservingOptionNew context:NULL];
    [[UIApplication sharedApplication] setStatusBarHidden:YES]; // Will notify the observer about the change
}

回答2:

From iOS 11 and up you can subclass the UIView of the view controller and override safeAreaInsetsDidChange:

override func safeAreaInsetsDidChange() {
  super.safeAreaInsetsDidChange()
  // adapt your view
}

Your view must share the top rect with the status bar for this to work. (But if it doesn't, you probably wouldn't need to detect changes anyway).

回答3:

In UIApplication class there is a property statusBarHidden...this tell status bar hidden or not...if it return YES mean status bar is hidden...try this.

来源：https://stackoverflow.com/questions/12832126/how-can-i-detect-uistatusbar-hide-and-show