Seems the bug is fixed in Xcode 13.2 beta (13C5066c) and iOS 15.2.
In my app I use three tabs. My app starts with tab 0. If I go to tab 1, the on onAppear-Method gets called. Last, I go to tab 2 but the onAppear-Method gets called twice. But the method should only called once.
Ghostwalk
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I am facing the same error in my app.
Here is an example of my code to reproduce it.
ModelContainer:
var sharedModelContainer: ModelContainer = {
let modelConfiguration = ModelConfiguration(schema: Schema(versionedSchema: CurrentModelSchema.self), isStoredInMemoryOnly: false)
do {
let container = try ModelContainer(
for: Schema(versionedSchema: CurrentModelSchema.self),
migrationPlan: AppMigrationPlan.self,
configurations: [modelConfiguration]
)
return container
} catch {
fatalError("Could not create ModelContainer: \(error)")
}
}()
CurrentModelSchema:
/// Current model schema
typealias CurrentModelSchema = ModelSchemaV3
/// Model references
typealias Test1 = CurrentModelSchema.Test1
typealias Test1 = CurrentModelSchema.Test2
The typealiases Test1 and Test2 are @Model-Classes.
AppMigrationPlan:
enum AppMigrationPlan: SchemaMigrationPlan {
static var schemas: [any VersionedSchema.Type] {
[ModelSchemaV1.self, ModelSchemaV2.self, ModelSchemaV3.self]
}
static let migrateV1toV2 = MigrationStage.custom(
fromVersion: ModelSchemaV1.self,
toVersion: ModelSchemaV2.self,
willMigrate: nil, // Logic to perform the migration of V1 schema
didMigrate: { context in
// Logic to perform the migration of V2 schema
let tests = try context.fetch(FetchDescriptor<ModelSchemaV2.Test1>())
// Do the migration operation....
}
try context.save()
}
)
static let migrateV2toV3 = MigrationStage.lightweight(
fromVersion: ModelSchemaV2.self,
toVersion: ModelSchemaV3.self
)
static var stages: [MigrationStage] {
// Migration stage that will be performed
[migrateV1toV2, migrateV2toV3]
}
}
Please let me know if you need more details to reproduce it.