Swift – iOS：更改导航栏的颜色

我正在尝试更改导航栏的颜色,但我发现如果导航器是根导的话,这是不可能的.

我正在尝试这个：

self.navigationController?.navigationBar.translucent = true

self.navigationController!.navigationBar.barTintColor = UIColor.blueColor()

我的所有Viewcontrollers都与导航控制器有关.然而,没有任何改变.事实上,我试图从故事板中制作相同的东西,但只有当我在第一个导航器中时才有效.

我试图阅读与此问题相关的所有内容,但一无所获

我可以像这样添加任何项目到导航栏

let HomeImage = UIImage(named: "home")!
    let Home : UIBarButtonItem = UIBarButtonItem(image: HomeImage,style: .Plain,target: self,action: "home:")
    navigationItem.rightBarButtonItem = Home

事实上,我发现解决方案是在AppDelegate.siwft中使用：

func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    UINavigationBar.appearance().barTintColor = UIColor(red: 0,green: 0/255,blue: 205/255,alpha: 1)
    UINavigationBar.appearance().tintColor = UIColor.whiteColor()
    UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName:UIColor.whiteColor()]

    return true
}

然后在每个视图控制器中,我们需要另一种背景颜色或其他东西

> segue应该与“show”不同
>使用func viewWillAppear

override func viewWillAppear(animated: Bool) {
     super.viewWillAppear(animated)
     self.navigationController?.navigationBar.barTintColor = UIColor.whiteColor()
     self.navigationController?.navigationBar.tintColor = UIColor.blueColor()
     self.navigationController!.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.blueColor()]
}