Swift 中 preferredStatusBarStyle

1. 首先需要在info.plst文件中添加 View controller-based status bar appearance 并将值设置为 YES
2. 在 tabBarController 添加以下代码

    override var childForStatusBarStyle: UIViewController? {
        return self.selectedViewController
    }
    
    override var childForStatusBarHidden: UIViewController? {
        return self.selectedViewController
    }

在 navigationController 中添加以下代码:

    override var childForStatusBarStyle: UIViewController? {
      return self.topViewController
  }
  
  override var childForStatusBarHidden: UIViewController? {
      return self.topViewController
  }

3.然后在需要在设置 StatusBar的ViewController中重写以下两个方法:

override var preferredStatusBarStyle: UIStatusBarStyle {
  return .lightContent
}
override var prefersStatusBarHidden: Bool {
  return false
}