Manages blocks of code that need to run once on version updates in iOS apps. This could be anything from data normalization to bug fixes.
This is a drop-in replacement of MTMigration's basic functionality as a Swift package. If you were using MTMigration's migrateToVersion functionality, you can use this Swift package instead. Note: This is not a complete replacement as it is missing MTMigration's applicationUpdateBlock and migrateToBuild functionality, which I have never needed.
Using Xcode, add a package dependency with URL "https://github.com/Clafou/Migration.git"
Add import Migration then call migrateToVersion with a version number and a block, and Migration will
ensure that the block of code is only ever run once for that version.
Migration.migrateToVersion("1.1") {
// Your migration code here
}You would want to run this code in your app delegate or similar.
Because Migration inspects your *-info.plist file for your actual version number and keeps track of the last migration, it will migrate all un-migrated blocks in-between. For example, let's say you had the following migrations:
Migration.migrateToVersion("0.9") {
// Some 0.9 stuff
}
Migration.migrateToVersion("1.0") {
// Some 1.0 stuff
}If a user was at version 0.8, skipped 0.9, and upgraded to 1.0, then both the 0.9 and 1.0 blocks would run.
For debugging/testing purposes, you can call reset to clear out the last recorded migration, causing all
migrations to run from the beginning:
Migration.reset()Migration assumes version numbers are incremented in a logical way, i.e. 1.0.1 -> 1.0.2, 1.1 -> 1.2, etc.
Version numbers that are past the version specified in your app will not be run. For example, if your *-info.plist file
specifies 1.2 as the app's version number, and you attempt to migrate to 1.3, the migration will not run.
Blocks are executed on the thread the migration is run on. Background/foreground situations should be considered accordingly.
This library does not handle some more intricate migration situations, if you come across intricate use cases from your own app, please add it and submit a pull request. Be sure to add test cases.
MTMigration: