Optionally, you can move to Swift 2.3 now and invoke the migration assistant again later to update to Swift 3.Īfter you invoke the migration assistant and you select “Use Swift 2.3” or “Use Swift 3”, you will be presented with a list of targets to migrate. You will get source changes to be able to build your project using Swift 3 and take advantage of all the new features in Xcode 8.0. Use Swift 2.3 Modifies your project to enable the Use Legacy Swift build setting and provides source changes to be able to build against the new SDKs.You can choose from two kinds of migration to perform: The assistant can also be invoked manually from the menu Edit -> Convert -> To Current Swift Syntax…

When you open your project with Xcode 8.0 for the first time, you will be prompted via the migration assistant to do a migration pass. If your project depends on other open-source projects that are provided by Carthage or CocoaPods, consult the Using Carthage/CocoaPods Projects section. To review and modify what is included in the scheme, invoke the “Edit Scheme…” sheet and select the “Build” tab from the column on the left, and make sure all your targets and their unit tests are included. The migration assistant does a migrator “build” to gather the changes, using the scheme you have selected, so the targets that will get processed are the ones that are included in the scheme. If you have multiple schemes that build different independent products (or the same product for different platforms) it is important to create one scheme that builds everything in your project and for all the platforms you need, including your unit test targets. This will allow you to easily review the changes that were applied via the migration assistant and to discard them and re-try the migration if needed. To get the most effective migration, make sure that the project that you intend to migrate builds successfully, and all its tests pass, when using Xcode 7.3.Īlso make sure that the project is managed under source control. Xcode 8.0 comes with a Swift Migrator tool that helps you migrate your project to Swift 3, or update it to work with Swift 2.3 and the new SDKs. This is a legacy document for Xcode 8 and migrating from Swift 2.

Objective c to swift migration