Swift UINavigationController(导航控制器)的建立及导航栏的设置

Swift语言新建的项目入口为AppDelegate.swiftswift 咱们找到app func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool 来建立导航控制器 let VC=ViewController()

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