iOS swift 状态栏UIStatusBar颜色设置

1. 需要将根视图改为navigation controller控制
2. 在AppDelegate添加如下代码：

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        //.导航栏
        let navBar=UINavigationBar.appearance()
        //.设置导航栏标题颜色
        navBar.titleTextAttributes = [ NSForegroundColorAttributeName : UIColor.whiteColor()]
        //.设置导航栏按钮颜色
        navBar.tintColor = UIColor.whiteColor()
        //.设置导航栏背景颜色
        navBar.barTintColor=UIColor(red: 49.0/255.0, green: 183.0/255.0, blue: 235.0/255.0, alpha: 1.0)
         //.状态栏文字白色风格
        UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: false)
        return true
    }

3.修改添加info.plist文件
添加View controller-based status bar appearance，设置为no,默认没有是yes