We made use of it but mostly only as a quick way to pinpoint source changes. Xcode’s built-in migration assistant is a good starting point, but it’s also likely to generate code that simply won’t work in your project.This means you can, for example, migrate the app and test targets to Swift 4 while private frameworks or libraries are kept in older versions.

Xcode 9 lets you use both Swift 3.2 and Swift 4 for different targets independently.There are a few things that might be valuable to keep in mind before starting the migration: This post highlights some of the challenges we came across while migrating our apps and hopefully will offer some useful insights for those of you who are planning to do so soon. It’s not an overwhelming reshape like Swift 3 was, and it’s not packed with new features like Swift 2, but there are really nice additions.

This new version is the result of 30 proposals created by the community over the course of a year. We launched a new app ?, Apple released iOS 11, we started using Xcode 9 in production, there’s an exciting new iPhone approaching fast, and of course, there’s the modest main character of this post, Swift 4. Earlier today I was wondering what adjective would best evoke the emotional landscape surrounding our iOS team for the last few weeks, and I think exhilarating would come pretty close.

Objective c to swift migration