基于swift的应用程序能在OS X 10.9 (Mavericks)/iOS 7及更低版本上运行吗?
例如，我有一台运行OS X 10.8 (Mountain Lion)的机器，我想知道我用Swift写的应用程序是否能在它上面运行。
或者我应该有什么创建一个Swift应用程序使用Mac OS?
当前回答
我在iPod Touch(第三代)设备上测试了一个基于swift的基本应用程序。基于swift的应用程序似乎无法在iOS 5上运行。但是在iOS 6.x上运行。
下面是我试图在iOS 5.0.1下启动测试应用程序时，调试日志中显示的内容:
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswift_stdlib_core.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftCoreGraphics.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftDarwin.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftDispatch.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftFoundation.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftObjectiveC.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftUIKit.dylib with errno=1
dyld: Symbol not found: _OBJC_CLASS_$_NSObject
Referenced from: /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswift_stdlib_core.dylib
Expected in: /usr/lib/libobjc.A.dylib
in /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswift_stdlib_core.dylib
对于iOS 6.1.6，应用程序运行良好，没有显示这些错误消息。
其他回答
我在iPod Touch(第三代)设备上测试了一个基于swift的基本应用程序。基于swift的应用程序似乎无法在iOS 5上运行。但是在iOS 6.x上运行。
下面是我试图在iOS 5.0.1下启动测试应用程序时，调试日志中显示的内容:
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswift_stdlib_core.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftCoreGraphics.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftDarwin.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftDispatch.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftFoundation.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftObjectiveC.dylib with errno=1
dyld: F_ADDFILESIGS failed for /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswiftUIKit.dylib with errno=1
dyld: Symbol not found: _OBJC_CLASS_$_NSObject
Referenced from: /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswift_stdlib_core.dylib
Expected in: /usr/lib/libobjc.A.dylib
in /private/var/mobile/Applications/59E31E79-9525-43B0-9DF6-8FEF3C0080F1/SwiftTestApp.app/Frameworks/libswift_stdlib_core.dylib
对于iOS 6.1.6，应用程序运行良好，没有显示这些错误消息。
Swift使用与Objective-C相同的运行时，甚至可以在同一个应用程序中与Objective-C共存(根据WWDC 2014的主题)。
这将需要使用Xcode 6和新的SDK进行检查/验证，以找到最终答案。
试试下面的代码:
它在没有StoryBoard的情况下工作:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window!.backgroundColor = UIColor.whiteColor()
// Create a nav/vc pair using the custom ViewController class
let nav = UINavigationController()
let vc = ViewController(nibName: "ViewController", bundle: nil)
// Push the vc onto the nav
nav.pushViewController(vc, animated: false)
// Set the window’s root view controller
self.window!.rootViewController = nav
// Present the window
self.window!.makeKeyAndVisible()
return true
}
由Leandros发布的回答代码片段似乎有点过时。我已经修复并使其在Swift 5中可编译。
斯威夫特5
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let controller = UIViewController()
let view = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 568))
view.backgroundColor = UIColor.red
controller.view = view
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 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
}
是的，事实上苹果已经宣布Swift应用程序将向后兼容iOS 7和OS X Mavericks。此外，WWDC应用程序是用Swift编程语言编写的。
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