Swift 应用程序在 ios 8.x 上呈现黑屏

Question

I have a very basic app:

• one view controller
• image background w/3 labels
• one button

When I run my app on iOS 9 no problem. On iOS 8.x: black screen.

here is my AppDelegate

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.

        let frame = UIScreen.mainScreen().bounds
        window = UIWindow(frame: frame)

        let rootView: HomeViewController = HomeViewController()

        if let window = self.window{
            window.rootViewController = rootView

            window.makeKeyAndVisible()
        }
        BITHockeyManager.sharedHockeyManager().configureWithIdentifier(Config.HOCKEY_APP_IDENTIFIER);
        BITHockeyManager.sharedHockeyManager().startManager();
        BITHockeyManager.sharedHockeyManager().authenticator.authenticateInstallation();


        UIApplication.sharedApplication().statusBarStyle = UIStatusBarStyle.LightContent

        return true
}

• bitcode is turned off.

Any ideas?

Answer 1

I had same bug in 8.0 for loading view controller from xib files. And that helped me:

let controller = HomeViewController(nibName: "HomeViewController", bundle: NSBundle.mainBundle())

NSBundle.mainBundle() was the key that helped me. By default he couldn't find xib file in the bundle

Answer 2

I had this bug with Xcode 8.3.3 and target iOS 8.0.

This bug occurs when the developer create a UIWindow.

If you are using Swift 3.1, use this:

self.window = UIWindow()
self.window?.makeKeyAndVisible()
self.window?.frame = UIScreen.main.bounds

self.window?.rootViewController = MyViewController(nibName: "MyViewController", bundle: Bundle.main)

Answer 3

Are you customizing the HomeViewController in the XIB or StoryBoard?

Because you are not using then to load the HomeViewController object

let rootView = HomeViewController(nibName: "HomeViewController", bundle: nil)

or customize a init method

convenience init() {   
               self.init(nibName: "HomeViewController", bundle: nil)
   }

and use like before

let rootView = HomeViewController()