Migrate from unencrypted realm to encrypted realm

问题

I'm trying to migrate from unencrypted realm to encrypted but I don't know how and where to use Realm().writeCopy(toFile: url, encryptionKey: key). or even if there is another way to do it.

Thank you.

回答1:

I found a way to do that, you can find it below:

private static var realm: Realm! {

    // Get the encryptionKey
    var realmKey = Keychain.realmKey
    if realmKey == nil {
        var key = Data(count: 64)

        key.withUnsafeMutableBytes { (bytes) -> Void in
            _ = SecRandomCopyBytes(kSecRandomDefault, 64, bytes)
        }
        realmKey = key
        Keychain.realmKey = realmKey
    }


    // Check if the user has the unencrypted Realm
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    let fileManager = FileManager.default
    let unencryptedRealmPath = "\(documentDirectory)/default.realm"
    let encryptedPath = "\(documentDirectory)/default_new.realm"
    let isUnencryptedRealmExsist = fileManager.fileExists(atPath: unencryptedRealmPath)
    let isEncryptedRealmExsist = fileManager.fileExists(atPath: encryptedPath)


    if isUnencryptedRealmExsist && !isEncryptedRealmExsist {
        let unencryptedRealm = try! Realm(configuration: Realm.Configuration(schemaVersion: 7))
        // if the user has unencrypted Realm write a copy to new path
        try? unencryptedRealm.writeCopy(toFile: URL(fileURLWithPath: encryptedPath), encryptionKey: realmKey)
    }

    // read from the new encrypted Realm path
    let configuration = Realm.Configuration(fileURL: URL(fileURLWithPath: encryptedPath), encryptionKey: realmKey, schemaVersion: 7, migrationBlock: { migration, oldSchemaVersion in })

    return try! Realm(configuration: configuration)
}

来源：https://stackoverflow.com/questions/53539941/migrate-from-unencrypted-realm-to-encrypted-realm