사용자 ID 연결 - Swift SDK

@interface LinkIdentitiesExample : NSObject
@end
@implementation LinkIdentitiesExample {
    RLMApp *app;
    RLMUser *anonymousUser;
}
// Entry-point for example.
- (void)runExample {
    app = [RLMApp appWithId:YOUR_APP_ID];
    [self logInAnonymously];
}
- (void)logInAnonymously {
    [app loginWithCredential:[RLMCredentials anonymousCredentials] completion:^(RLMUser *user, NSError *error) {
        if (error != nil) {
            NSLog(@"Failed to log in: %@", [error localizedDescription]);
            return;
        }
        // User uses app, then later registers an account
        [self registerNewAccountAsAnonymousUser: user];
    }];
}
- (void)registerNewAccountAsAnonymousUser:(RLMUser *)user {    
    NSString *email = @"link2@example.com";
    NSString *password = @"ganondorf";
    [[app emailPasswordAuth] registerUserWithEmail:email password:password completion:^(NSError *error) { 
            if (error != nil) {
                NSLog(@"Failed to register new account: %@", [error localizedDescription]);
                return;
            }
            // Successfully created account, now link it
            // with the existing anon user
            [self linkUser:self->anonymousUser withCredentials:[RLMCredentials credentialsWithEmail:email password:password]];     
    }];
}
- (void)linkUser:(RLMUser *)user withCredentials:(RLMCredentials *)credentials {
    [[app currentUser] linkUserWithCredentials:credentials completion:^(RLMUser *user, NSError *error) {
        if (error != nil) {
            NSLog(@"Failed to link user: %@", [error localizedDescription]);
            return;
        }
        NSLog(@"Successfully linked user: %@", user);
        
    }];
}
@end 

let app = App(id: YOUR_APP_SERVICES_APP_ID)
func logInAnonymously() {
    app.login(credentials: Credentials.anonymous) { (result) in
        switch result {
        case .failure(let error):
            print("Failed to log in: \(error.localizedDescription)")
        case .success(let user):
            // User uses app, then later registers an account
            registerNewAccount(anonymousUser: user)
        }
    }
}
func registerNewAccount(anonymousUser: User) {
    let email = "swift-link@example.com"
    let password = "ganondorf"
    app.emailPasswordAuth.registerUser(email: email, password: password) { (error) in
        guard error == nil else {
            print("Failed to register new account: \(error!.localizedDescription)")
            return
        }
        // Successfully created account, now link it
        // with the existing anon user
        link(user: anonymousUser, with: Credentials.emailPassword(email: email, password: password))
    }
}
func link(user: User, with credentials: Credentials) {
    user.linkUser(credentials: credentials) { (result) in
        switch result {
        case .failure(let error):
            print("Failed to link user: \(error.localizedDescription)")
        case .success(let user):
            print("Successfully linked user: \(user)")
        }
    }
}
logInAnonymously()