iOS7-状态栏下的视图-edgesForExtendedLayout 不起作用

在iOS7及更高版本中，开发人员可以通过设置视图控制器的edgesForExtendedLayout属性来控制状态栏下的视图的布局行为。然而，有时候我们会遇到edgesForExtendedLayout属性不起作用的情况。本文将探讨这个问题，并提供解决方案。

swift
navigationController?.edgesForExtendedLayout = UIRectEdge.top

swift
view.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true

swift
view.autoresizingMask = [.flexibleWidth, .flexibleHeight]

swift
class MyViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置edgesForExtendedLayout属性为UIRectEdgeTop
        edgesForExtendedLayout = UIRectEdge.top
        
        // 检查父视图控制器的edgesForExtendedLayout属性
        if let parentViewController = parent as? UINavigationController {
            parentViewController.edgesForExtendedLayout = UIRectEdge.top
        }
        
        // 添加顶部布局约束
        view.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        
        // 设置自动调整行为
        view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    }
    
    // ...
}