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

14

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?

2 Answers

4

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

3

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

14

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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9

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

edit

Swift sets some bits in the Objective-C metadata to mark Swift classes. libobjc in OS X 10.9 and iOS 7.0 was changed to ignore these bits in preparation for Swift's arrival. Older OS versions will be confused by these bits. - Greg Parker Jun 21, 2014 at 1:05

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