7/15/2023 0 Comments Downcast only unwraps optionalsHere is a brief overview of the more impactful source-breaking changes: API Design Guidelines You can see an overview of the Swift 3 evolution proposals here: There have been many significant changes for Swift 3, which the migrator will help you with. If you need to apply any workarounds, discard the changes that you accepted from the migration assistant earlier, apply the workarounds, and invoke the assistant manually to re-try the conversion from the start. If you see other errors, please file a bug report at and include the details. If you see errors about not being able to code-sign the target, try disabling code-signing from the build settings of the target. Check the log for errors that may have showed up. Switch to the “Report Navigator” and select the ‘Convert’ entry that was added this is the conversion build log. There may have been issues with processing the targets, that will negatively impact the migration process. If you chose to move to Swift 2.3, the targets will have the “Use Legacy Swift” build setting set. Clicking ‘Save’ will apply the source changes to the original files. Note that in the diff view, the original source (before conversion) is on the right and the changes are on the left. When this is done, you will be presented with all the changes that will be applied once you click on ‘Save’. Targets that do not contain any Swift code will not be selected.Ĭlicking ‘Next’ will bring up the ‘Generate Preview’ sheet and the assistant will initiate a migration ‘build’ to get source changes. 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.
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