UI导航栏颜色

Question

我已经编写了以下代码来设置导航栏和视图控制器的视图：

1. AppDelegate 的导航栏：

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

2. MainViewController A：

   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)
   

这导致顶部导航栏的视图显示为半透明的蓝色。

然后我在另一个 ViewController B（它是一个表视图控制器）中做同样的事情：

1. 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MainViewController A中有半透明导航栏，而MainViewController B却显示不出来？

如何让它们都显示相同的半透明彩色导航栏？

Answer 1

使用这个方法改变UINavigationBar所有的地方全局，从AppDelegate调用它

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：您需要根据您的要求和用户界面对其进行修改