You are strongly encouraged to attach a project that illustrates the faulty migration if possible. If you see other errors, please file a bug report 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. This will also change the Swift Language Version build setting for the migrated targets to Swift 4. When this is done, you will be presented with all the changes that will be applied once you click on ‘Save’. This option does not change the size of your binary as it adds explicit attributes everywhere they were implicitly added by Swift 3.įor more information and implications of these two choices, see the Xcode Help article Migrate to Swift 4 inference.Ĭlicking Next will bring up the Generate Preview sheet and the assistant will initiate a migration build to get source changes. Match Swift 3 Behavior: Add an attribute to your code anywhere it would be implicitly inferred by the compiler.After using this option you need to follow the manual steps detailed in Completing a Swift 4 minimize inference migration to complete the conversion. Minimize Inference: Add an attribute to your code only where it is needed based on static inference.There is only one migration workflow this year, although there is a choice between two kinds of Inference: Targets that do not contain any Swift code will not be selected. You will be presented with a list of targets to migrate. You can be reminded later or invoke the Migrator manually from the menu Edit -> Convert -> To Current Swift Syntax… When you open your project with Xcode 9 for the first time, you will see a migration opportunity item in the Issue Navigator: click it to activate a sheet asking you if you’d like to migrate. 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. While migrating to Swift 4 is definitely encouraged, it’s not an all-or-nothing process, as Swift 3.2 and Swift 4 targets can coexist and link together. That means you decide when and if you’d like to migrate on a per-target basis when it makes sense for your project. 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.ĭifferent from last year, the Migrator is built directly into the compiler and not a separate tool, so it can understand both Swift 3.2 and Swift 4 code equally and compile them together, just like the Swift 4 compiler can. It’s highly recommended to have your project managed under source control. Keep in mind that Swift 3.2 does have significant changes from 3.1, as well as the SDKs against which you built, so you may need to resolve errors initially. Make sure that the project that you intend to migrate builds successfully in Swift 3.2 mode, and all its tests pass. Xcode 9.0 comes with a Swift Migrator tool that helps you migrate your project to Swift 4. This is a legacy document for Xcode 9 and migrating from Swift 3.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |