How do I see which version of Swift I'm using?

Question

I just created a new Swift project within Xcode. I am wondering which version of Swift it's using.

How can I see, in Xcode or the terminal, what version of Swift I am using inside my project?

Answer 1

What I do is say in the Terminal:

$ xcrun swift -version 

Output for Xcode 6.3.2 is:

Apple Swift version 1.2 (swiftlang-602.0.53.1 clang-602.0.53) 

Of course that assumes that your xcrun is pointing at your copy of Xcode correctly. If, like me, you're juggling several versions of Xcode, that can be a worry! To make sure that it is, say

$ xcrun --find swift 

and look at the path to Xcode that it shows you. For example:

/Applications/Xcode.app/... 

If that's your Xcode, then the output from -version is accurate. If you need to repoint xcrun, use the Command Line Tools pop-up menu in Xcode's Locations preference pane.

Answer 2

Project build settings have a block 'Swift Compiler - Languages', which stores information about Swift Language Version in key-value format. It will show you all available (supported) Swift Language Version for your Xcode and active version also by a tick mark.

Project ► (Select Your Project Target) ► Build Settings ► (Type 'swift_version' in the Search bar) Swift Compiler Language ► Swift Language Version ► Click on Language list to open it (and there will be a tick mark on any one of list-item, that will be current swift version).

Look at this snapshot, for easy understanding:

---

With help of following code, programmatically you can find Swift version supported by your project.

#if swift(>=5.3) print("Hello, Swift 5.3")  #elseif swift(>=5.2) print("Hello, Swift 5.2")  #elseif swift(>=5.1) print("Hello, Swift 5.1")  #elseif swift(>=5.0) print("Hello, Swift 5.0")  #elseif swift(>=4.2) print("Hello, Swift 4.2")  #elseif swift(>=4.1) print("Hello, Swift 4.1")  #elseif swift(>=4.0) print("Hello, Swift 4.0")  #elseif swift(>=3.2) print("Hello, Swift 3.2")  #elseif swift(>=3.0) print("Hello, Swift 3.0")  #elseif swift(>=2.2) print("Hello, Swift 2.2")  #elseif swift(>=2.1) print("Hello, Swift 2.1")  #elseif swift(>=2.0) print("Hello, Swift 2.0")  #elseif swift(>=1.2) print("Hello, Swift 1.2")  #elseif swift(>=1.1) print("Hello, Swift 1.1")  #elseif swift(>=1.0) print("Hello, Swift 1.0")  #endif 

Here is result using Playground (with Xcode 11.x)