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Last active December 22, 2022 09:41
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Migrate NSUserDefaults to App Groups - Swift
func migrateUserDefaultsToAppGroups() {
// User Defaults - Old
let userDefaults = NSUserDefaults.standardUserDefaults()
// App Groups Default - New
let groupDefaults = NSUserDefaults(suiteName: "group.myGroup")
// Key to track if we migrated
let didMigrateToAppGroups = "DidMigrateToAppGroups"
if let groupDefaults = groupDefaults {
if !groupDefaults.boolForKey(didMigrateToAppGroups) {
for key in userDefaults.dictionaryRepresentation().keys {
groupDefaults.setObject(userDefaults.dictionaryRepresentation()[key], forKey: key)
groupDefaults.setBool(true, forKey: didMigrateToAppGroups)
print("Successfully migrated defaults")
} else {
print("No need to migrate defaults")
} else {
print("Unable to create NSUserDefaults with given app group")
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I don't really understand why would you call userDefaults.dictionaryRepresentation() twice when you can just do

for (key, value) in standardDefaults.dictionaryRepresentation() {
    groupDefaults.set(value, forKey: key)

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