设置所有页面导航栏

func setupNaviBar() {

    let navigationBarAppearace = UINavigationBar.appearance()
// 设置 tintColor 为白色
    navigationBarAppearace.tintColor = .white
// 设置 bar 的颜色为主题色
    navigationBarAppearace.barTintColor = Global.ThemeColor
// 设置 title 的字体为白色
    navigationBarAppearace.titleTextAttributes =
      [NSForegroundColorAttributeName: UIColor.white]
    
    let backImg: UIImage = UIImage(named: "btn-Left")!
      .withRenderingMode(.alwaysOriginal)
// 设置返回按钮图片
    UINavigationBar.appearance()
      .backIndicatorImage = backImg
// 设置返回按钮图片
    UINavigationBar.appearance()
      .backIndicatorTransitionMaskImage = backImg
// 将返回按钮的字移到屏幕上面
    UIBarButtonItem.appearance()
      .setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -100), for: .default)
  }

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