Do Swift-based applications work on OS X 10.9/iOS 7 and lower?

Question

Will Swift-based applications work on OS X 10.9 (Mavericks)/iOS 7 and lower?

For example, I have a machine running OS X 10.8 (Mountain Lion), and I am wondering if an application I write in Swift will run on it.

Or what should I have to create a Swift application using Mac OS?

Answer 1

I just tested it for you, Swift applications compile into standard binaries and can be run on OS X 10.9 and iOS 7.

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Simple Swift application used for testing:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {     self.window = UIWindow(frame: UIScreen.mainScreen().bounds)      var controller = UIViewController()     var view = UIView(frame: CGRectMake(0, 0, 320, 568))     view.backgroundColor = UIColor.redColor()     controller.view = view      var label = UILabel(frame: CGRectMake(0, 0, 200, 21))     label.center = CGPointMake(160, 284)     label.textAlignment = NSTextAlignment.Center     label.text = "I'am a test label"     controller.view.addSubview(label)      self.window!.rootViewController = controller     self.window!.makeKeyAndVisible()     return true } 

Answer 2

Swift code can be deployed to OS X 10.9 and iOS 7.0. It will usually crash at launch on older OS versions.