UINavigation条颜色

Question

我写了下面的代码来设置导航栏和视图控制器的看法：

1. 导航条在AppDelegate中：

   var navigationController = UINavigationController() 
   
   navigationController.viewControllers = [mainViewController] 
   

2. MainViewController答：

   self.view.backgroundColor = UIColor.blue 
   let fullScreenRect = UIScreen.main.bounds 
   let buttonSize:CGFloat = 60 
   let viewLogButton = UIButton(frame: CGRect(x: 0, y: fullScreenRect.size.height-buttonSize, width:fullScreenRect.size.width, height: buttonSize)) 
   viewLogButton.setTitle("View Log", for: UIControlState.normal) 
   viewLogButton.setTitleColor(UIColor.white, for: .normal) 
   viewLogButton.setTitleColor(UIColor.blue, for: .highlighted) 
   viewLogButton.backgroundColor = UIColor.blue 
   viewLogButton.addTarget(self, action: #selector(viewLogButtonPressed), for: .touchUpInside) 
   self.view.addSubview(viewLogButton) 
   self.webView.frame = CGRect(x: 0, y: UIConstants.NAVIGATION_BAR_HEIGHT+UIConstants.STATUS_BAR_HEIGHT, width: fullScreenRect.size.width, height: fullScreenRect.size.height-buttonSize-UIConstants.NAVIGATION_BAR_HEIGHT-UIConstants.STATUS_BAR_HEIGHT) 
   self.view.addSubview(self.webview) 
   

导致顶部导航栏显示半透明蓝色的视图。

我然后做同样在另一个的ViewController B（其是表视图控制器）：

MainViewController B：

let tableView = UITableView() 
let screenSize: CGRect = UIScreen.main.bounds  
self.view.backgroundColor = UIColor.blue 
let screenWidth = screenSize.width 
let screenHeight = screenSize.height 
tableView.frame = CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight)  
self.view.addSubview(tableView) 

我想知道为什么MainVi中有半透明的导航条ewController A但MainViewController B无法显示？

我怎样才能让他们都显示相同的半透明颜色导航栏？

Answer 1

使用此方法Globaly改变UINavigationBar的所有地方，从AppDelegate

func setupNaviBarAppearnce() { 

    UINavigationBar.appearance().isOpaque = true 
    UINavigationBar.appearance().isTranslucent = true 
    UINavigationBar.appearance().barTintColor = Theme.AppMainPurpleColor 
    UINavigationBar.appearance().tintColor = UIColor.white 
    UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName:Typography.navigationTitle!,NSForegroundColorAttributeName:UIColor.white] 
} 

注意调用它：你需要修改它按照您的要求和UI