Swift's language was unveiled to the swift development team on June 2, 2014. and September 9, 2014 ushered in Swift's second milestone, the swift1.0 version (GM), which means that no matter whether your application has a part of the function is written in Swift, or the entire application is written in pure swift, You can share your results with the world by submitting this app to the Apple store.
You may have noticed that we used the GM designator, not final, because Swift would also continue to add new features to improve performance and redefine the syntax.
So from now on, you can confidently use the swift language to write new applications, or use the Swift language to write a certain part of your application without worrying about the embarrassment of being rejected by the Apple Store for language problems.
Swift ushered in the 1.0 GM Edition (2014.09.09)