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

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It appears Swift applications don t run on OS X 10 7  I just created a simple GUI application  a view  a lable  a button  which runs fine on Mavericks  The base SDK is set to 10 9 and the deployment target to 10 7  I copied that application from the DerivedData folder over to my 10 7 virtual machine  and it crashs when starting  show this error   Crashed Thread   0  Exception Type   EXC BREAKPOINT  SIGTRAP  Exception Codes  0x0000000000000002  0x0000000000000000  Application Specific Information  dyld  launch  loading dependent libraries      Dyld Error Message     Library not loaded   System Library Frameworks CoreGraphics framework Versions A CoreGraphics   Referenced from   Users USER Desktop Swift-Test app Contents MacOS    Frameworks libswiftAppKit dylib   Reason  image not found  Binary Images         0x109c65000 -        0x109c6afff  private Swift-Test  1 0 - 1   lt 649695D0-58FD-3D02-9176-2D40D4E711F2 gt   Users USER Desktop Swift-Test app Contents MacOS Swift-Test        0x109c83000 -        0x109dbffff  libswift stdlib core dylib  1 0 - 600 0 34 4 5   lt 10AAC369-9404-321D-A892-49F65856D7AF gt   Users USER Desktop Swift-Test app Contents Frameworks libswift stdlib core dylib       However this message is irritating  since there s certainly a CoreGraphics library in this VM  Other applications that make heavy use of CoreGraphics work just fine

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Quick Update  effective from February 15th  2015  we cannot submit apps to the store that were developed using an SDK prior to iOS 8  So  keeping that in mind   its better to not to worry about this issue as many people have suggested that apps made in Swift can be deployed to OS X 10 9 and iOS 7 0 as well

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Answered code-snippet posted by Leandros seems bit old  I have fixed and made it compilable in Swift 5  Swift 5 func application application  UIApplication  didFinishLaunchingWithOptions launchOptions  NSDictionary   - gt  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    quot I am a test label quot      controller view addSubview label       self window  rootViewController   controller     self window  makeKeyAndVisible       return true

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Swift code can be deployed to OS X 10 9 and iOS 7 0  It will usually crash at launch on older OS versions

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This is the post I read from apple Swift blog  might be helpful   App Compatibility   If you write a Swift app you can trust that your app will work well into the future  In fact  you can target back to OS X Mavericks or iOS 7 with that same app  This is possible because Xcode embeds a small Swift runtime library within your app s bundle  Because the library is embedded  your app uses a consistent version of Swift that runs on past  present  and future OS releases   Binary Compatibility and Frameworks   While your app s runtime compatibility is ensured  the Swift language itself will continue to evolve  and the binary interface will also change  To be safe  all components of your app should be built with the same version of Xcode and the Swift compiler to ensure that they work together   This means that frameworks need to be managed carefully  For instance  if your project uses frameworks to share code with an embedded extension  you will want to build the frameworks  app  and extensions together  It would be dangerous to rely upon binary frameworks that use Swift     especially from third parties  As Swift changes  those frameworks will be incompatible with the rest of your app  When the binary interface stabilizes in a year or two  the Swift runtime will become part of the host OS and this limitation will no longer exist

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While code confirms it  Apple itself has said that Swift will be compatible on iOS 7 and Mavericks in their technical keynote  State of the platforms  session 102  around the 34 nbsp min 00 nbsp sec mark  at WWDC 2014

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Try the following code   It s working without StoryBoard   func application application  UIApplication  didFinishLaunchingWithOptions launchOptions  NSDictionary   - gt  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

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There seems to be a lot of old answers here so I just wanted to post the official response from the Swift team  Swift is backwards compatible with OS X Mavericks and iOS 7  Apple developer swift blog   Objective-C id as Swift Any  Jul 11  2014  Compatibility  One of the most common questions we heard at WWDC was     What is the compatibility story for Swift      This seems like a great first topic   App Compatibility Simply put  if you write a Swift app today and submit it to the App Store this Fall when iOS 8 and OS X Yosemite are released  you can trust that your app will work well into the future  In fact  you can target back to OS X Mavericks or iOS 7 with that same app  This is possible because Xcode embeds a small Swift runtime library within your app   s bundle  Because the library is embedded  your app uses a consistent version of Swift that runs on past  present  and future OS releases

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I read all answers that said  No  Swift does not work with less than iOS nbsp 7  But I said YES  I just created a Swift project that does run in Xcode nbsp 5 with 6 0 deployment target    I just create a demo project in Xcode nbsp 6 BETA with the Swift programming language selected  Close Xcode nbsp 6 beta  and I open this demo project in Xcode nbsp 5 with deployment target 6 0 And also select simulator 6 1    Then that project runs well in simulator 6 1  My MacOS X is 10 9 3  so I said yes  that runs in lower than iOS nbsp 7  with 10 9 3 Mac nbsp OS nbsp X   Here it is a screenshot of the simulator     Here is a demo as well

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Apple has announced that Swift apps will be backward compatible with iOS 7 and OS X Mavericks  The WWDC app is written in Swift

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I tested running a bare-bone  Swift-based app on an iPod Touch  3rd gen  device  It appears Swift-based apps don t work with iOS 5 x but do work with iOS 6 x   Here s what shows up in the debug log when I tried to launch the test app with iOS 5 0 1   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   For iOS 6 1 6  the app runs fine without displaying those error messages

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Swift applications are supported on iOS 7 and above as stated in Beta 4 release notes  iOS 6 0  6 1  7 0  7 1  8 0 in Xcode 6 Beta  Swift applications are supported on platforms OS X 10 9 and above  OS X 10 4 to 10 10 in Deployment Target  I have tested on targeting 10 5 to 10 10  and running on 10 9 3

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When it comes to Swift Frameworks  As for today  with Xcode version 6 1 1  6A2008a   if the Swift framework is targeted to iOS 7 1  linker report warning  ld  warning  embedded dylibs frameworks only run on iOS 8 or later    and application can t be submitted to AppStore  Check this issue   Lint to prevent dynamic libraries and frameworks from passing with iOS 7

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Update - As per  Xcode 6 Beta 4  iOS 7 and OS X 10 9 minimum deployment target The Swift compiler and Xcode now enforce a minimum deployment target of iOS 7 or OS X Mavericks  Setting an earlier deployment target results in a build failure   From Xcode 6 release note So my previous answer Shown below  will not be applicable to any further development  Swift will no longer available for iOS6 and below  A Swift application can be run on iOS  6  Even though many people are saying that Swift will support only iOS 7  and OS  X 10 9   from my experience it s not  I have tested a simple application written completely in Swift in an iOS  6 device  It works perfectly fine  As Apple says  Swift code is binary compatible with Objective-C code  It uses the same compiler and runtime to create the binary  Here is the code I have tested  import UIKit  class ViewController  UIViewController        override func viewDidLoad              super viewDidLoad            let button     UIButton buttonWithType UIButtonType System  as UIButton         button frame   CGRectMake 100  100  100  50          button backgroundColor   UIColor greenColor           button setTitle  quot Test Button quot   forState  UIControlState Normal          button addTarget self  action   quot buttonTapped  quot   forControlEvents  UIControlEvents TouchUpInside           self view addSubview button             func buttonTapped sender  UIButton             println  quot buttonTapped quot            It is a simple application  just adding a button programmatically  My application contains only two files  AppDelegate swift and ViewController swift  So if you are not using any new APIs added as part of the iOS  8 SDK or some Swift specific APIs  corresponding API is not available for Objective-C  your application will seamlessly work on iOS  6 or later  tested and working   even on iOS  5  not tested   Most of the APIs in Swift are just the replacement of the existing Objective-C APIs  In fact they are the same in binary  Note  As per Xcode 6 beta 4 for swift apps deployment target should be iOS 7 or OS X 10 9 see the above update   So swift will no longer available for iOS6 and below

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I also tried a very simple app on 10 8  one button  sets text on a label    It crashed at startup  as Greg Parker stated   Dyld Error Message    Symbol not found    dispatch source type memorypressure   Referenced from   Volumes   SwifTest app Contents MacOS    Frameworks libswiftDispatch dylib   Expected in   usr lib libSystem B dylib in  Volumes   SwifTest app Contents MacOS    Frameworks libswiftDispatch dylib    This was using a deployment target of 10 7

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I just tested it for you  Swift applications compile into standard binaries and can be run on OS X 10 9 and iOS 7     Simple Swift application used for testing   func application application  UIApplication  didFinishLaunchingWithOptions launchOptions  NSDictionary   - gt  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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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    This will need to be checked verified using Xcode 6 and the new SDK to find a final answer

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Yes  in fact Apple has announced that Swift apps will be backward compatible with iOS 7 and OS X Mavericks  Furthermore the WWDC app is written in the Swift programming language

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In brief   Swift based applications can target back to OS X Mavericks or iOS 7 with that same app   How is it possible    Xcode embeds a small Swift runtime library within your app   s bundle  Because the library is embedded  your app uses a consistent version of Swift that runs on past  present  and future OS releases   Why should I trust this answer    Because I am not saying this answer as one apple guy told me in twitter or I wrote hello world and tested it   I took it from apple developer blog   so you can trust this

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

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