在UICollectionView中添加导航栏在iOS 4中，iOS 11

Question

升级iOS 11和Swift 4（Xcode 9）后，我遇到了很多UI问题。 :(
最无法解决的问题是导航问题。
我把导航栏UICollectionView控制器。
导航栏高度不正确显示和但是我写的代码。

我设置导航栏的高度“ 100" 。我写这篇文章的代码viewDidLoad中（）。

if #available(iOS 11.0, *) { 

     print("IOS 11 Screen") 

     UINavigationBar.appearance().largeTitleTextAttributes = [ 
      NSForegroundColorAttributeName: UIColor.white, 

     ] 
     navigationItem.largeTitleDisplayMode = .never 
     let height: CGFloat = 100 //whatever height you want 
     let bounds = self.navigationController!.navigationBar.bounds 
     self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height) 


    } else { 
     print("lower than IOS 11 Screen") 
     // Fallback on earlier versions 
    } 

collectionview?.frame = CGRect(x: 0, y: 10, width: UIScreen.main.bounds.width, height: (UIScreen.main.bounds.height + 20)) <br> 

override func viewDidAppear(_ animated: Bool) { 
    super.viewDidAppear(animated) 
    let height: CGFloat = 100 //whatever height you want 
    let bounds = self.navigationController!.navigationBar.bounds 
    self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height) 

} 


override func viewWillAppear(_ animated: Bool) { 
     let height: CGFloat = 100 //whatever height you want 
     let bounds = self.navigationController!.navigationBar.bounds 
     self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height) 
    } 

不过，我试着用这个代码。没有为我工作。

我还试图打开源代码视图故事板，我编辑导航栏的高度。但是，这也行不通。
任何人都可以帮助我吗？自过去两天以来，我一直试图解决这个问题。

Answer 1

请检查：

override func viewDidLoad() { 
    if #available(iOS 11.0, *) { 
     print("IOS 11 Screen") 
     UINavigationBar.appearance().largeTitleTextAttributes = [ 
      NSForegroundColorAttributeName: UIColor.white, 
     ] 
     self.navigationController?.navigationBar.prefersLargeTitles = true // added this line 
     navigationItem.largeTitleDisplayMode = .never 
    } else { 
     print("lower than IOS 11 Screen") 
     // Fallback on earlier versions 
    } 
} 

override func viewDidAppear(_ animated: Bool) { 
    super.viewDidAppear(animated) 
    let height: CGFloat = 100 //whatever height you want 
    let bounds = self.navigationController!.navigationBar.bounds 
    self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height) 
}