ios纯代码下的起始页面配置方法

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在delegate中：

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        let SCREEN_WIDTH = UIScreen.mainScreen().bounds.size.width
        let SCREEN_HEIGHT = UIScreen.mainScreen().bounds.size.height
        self.window = UIWindow(frame: CGRectMake(0,0,SCREEN_WIDTH,SCREEN_HEIGHT))
        self.window?.rootViewController = RootViewController()
        self.window?.makeKeyAndVisible()
        return true
    }

ios纯代码下的起始页面配置方法

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原文地址：http://www.cnblogs.com/luoxiaoxi/p/5380178.html