基于Swift的应用程序是否可以在OS X 10.9 / iOS 7及更低版本上运行？

本文翻译自：Do Swift-based applications work on OS X 10.9/iOS 7 and lower?

Will Swift-based applications work on OS X 10.9 (Mavericks)/iOS 7 and lower? 基于Swift的应用程序能否在OS X 10.9 （Mavericks）/ iOS 7及更低版本上运行？

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. 例如，我有一台运行OS X 10.8 （Mountain Lion）的计算机，我想知道我用Swift编写的应用程序是否可以在其上运行。

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#1楼

参考：https://stackoom.com/question/1chxS/基于Swift的应用程序是否可以在OS-X-iOS-及更低版本上运行

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#2楼

Swift uses the same runtime as Objective-C and can even live side-by-side Objective-C in the same application (as per the WWDC 2014 keynote). Swift使用与Objective-C相同的运行时，甚至可以在同一应用程序中并排使用Objective-C（根据WWDC 2014主题演讲）。

This will need to be checked/verified using Xcode 6 and the new SDK to find a final answer. 这需要使用Xcode 6和新的SDK进行检查/验证，以找到最终答案。

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#3楼

I just tested it for you, Swift applications compile into standard binaries and can be run on OS X 10.9 and iOS 7. 我刚刚为您测试过，Swift应用程序可以编译为标准二进制文件，并且可以在OS X 10.9和iOS 7上运行。

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Simple Swift application used for testing: 用于测试的简单Swift应用程序：

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
}

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#4楼

Apple has announced that Swift apps will be backward compatible with iOS 7 and OS X Mavericks. 苹果已经宣布，Swift应用程序将与iOS 7和OS X Mavericks向后兼容。 The WWDC app is written in Swift. WWDC应用程序是用Swift编写的。

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#5楼

Swift code can be deployed to OS X 10.9 and iOS 7.0. 可以将Swift代码部署到OS X 10.9和iOS 7.0。 It will usually crash at launch on older OS versions. 在较旧的OS版本上启动时，它通常会崩溃。

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#6楼

尽管代码确认了这一点，但苹果公司本身已经在2014年WWDC的技术主题演讲（ 平台状态，第 102场，大约34分00秒）中表示，Swift将与iOS 7和Mavericks兼容。