Youtube - Objective-C

Are you looking to develop an application that integrates with Youtube using Objective-C? Look no further! In this article, we'll explore what Objective-C is, how to authenticate your user, retrieve channel information, and upload videos to Youtube using the Objective-C programming language.

What is Objective-C?

Objective-C is a high-level, object-oriented programming language that is used to develop applications for iOS, macOS, and other Apple platforms. It is an extension of the C programming language and was developed by Apple Inc. in the early 1980s.

Objective-C is popular for iOS and macOS development because of its simple syntax, dynamic nature, and support for message passing. It allows developers to create applications that are easy to read, debug, and maintain.

Authenticating Your User

Before accessing Youtube APIs, you will need to authenticate your user. Youtube uses OAuth 2.0 to authenticate users and grant access to the API. In Objective-C, this can be done using the GTMOAuth2 library.

Here's an example of how to authenticate a user:

- (void)authenticateUser {
  GTMOAuth2Authentication *auth = [GTMOAuth2Authentication authenticationWithServiceProvider:@"youtube"
                                                                                    tokenURL:[NSURL URLWithString:@"https://accounts.google.com/o/oauth2/token"]
                                                                                 redirectURI:@"http://localhost"
                                                                                    clientID:@"YOUR_CLIENT_ID"
                                                                                clientSecret:@"YOUR_CLIENT_SECRET"];

  [GTMOAuth2ViewControllerTouch authorizeFromController:self
                                            authentication:auth
                                            completionHandler:^(GTMOAuth2ViewControllerTouch *viewController, GTMOAuth2Authentication *auth, NSError *error) {
    if (error == nil) {
        // Successful
    } else {
        // Error
    }
  }];
}

Note: Replace "YOUR_CLIENT_ID" and "YOUR_CLIENT_SECRET" with your Youtube account's client id and client secret.

This method creates a GTMOAuth2Authentication object, which is used to authenticate the user with Youtube. Once authentication is successful, the GTMOAuth2ViewControllerTouch object will call the completion handler block, where you can perform any additional tasks.

Retrieving Channel Information

Now that you have authenticated the user, you can retrieve the user's channel information. In Objective-C, this can be done using the GData library.

Here's an example of how to retrieve channel information:

- (void)getUserChannel {
    NSURL *feedURL = [NSURL URLWithString:@"https://gdata.youtube.com/feeds/api/users/default/uploads"]
    GDataServiceGoogleYouTube *service = [[GDataServiceGoogleYouTube alloc] init];
    [service setShouldCacheResponseData:YES];
    [service setYouTubeDeveloperKey:@"YOUR_DEVELOPER_KEY"];
    [service setUserCredentialsWithUsername:auth.userEmail token:auth.accessToken];

    GDataQueryYouTube *query = [GDataQueryYouTube queryWithFeedURL:feedURL];
    [query setMaxResults:50];

    [service fetchFeedWithQuery:query
             completionHandler:^(GDataServiceTicket *ticket, GDataFeedBase *feed, NSError *error) {
        if (error) {
            // Error
        } else {
            // Successful
        }
    }];
}

Note: Replace "YOUR_DEVELOPER_KEY" with your Youtube account's developer key.

This method creates a GDataQueryYouTube object, which is used to retrieve the user's channel information. Once the fetch is successful, the completionHandler block is called, where you can perform any additional tasks.

Uploading Videos to Youtube

Now that you can authenticate the user and retrieve channel information, you can upload videos to Youtube! In Objective-C, this can be done using the Google API Client library.

Here's an example of how to upload a video:

- (void)uploadVideo {
    GTLRYouTubeService *service = [[GTLRYouTubeService alloc] init];
    service.authorization = auth;

    GTLRYouTube_Video *video = [GTLRYouTube_Video object];
    video.snippet = [GTLRYouTube_VideoSnippet object];
    video.snippet.title = @"My video";
    video.snippet.descriptionProperty = @"This is my video";
    video.status = [GTLRYouTube_VideoStatus object];
    video.status.privacyStatus = @"unlisted";

    NSURL *fileURL = [NSURL URLWithString:@"file:///path/to/my/video.mp4"];
    NSFileHandle *fileHandle = [NSFileHandle fileHandleForReadingFromURL:fileURL error:nil];
    NSUInteger fileSize = (NSUInteger)[fileHandle seekToEndOfFile];
    [fileHandle seekToFileOffset:0];
    GTLRUploadParameters *uploadParameters = [GTLRUploadParameters uploadParametersWithFileHandle:fileHandle
                                                                                        MIMEType:@"video/mp4"];
    uploadParameters.shouldUploadWithSingleRequest = YES;

    GTLRYouTubeQuery_VideosInsert *query = [GTLRYouTubeQuery_VideosInsert queryWithObject:video
                                                                                 part:@"snippet,status"
                                                                     uploadParameters:uploadParameters];

    GTLRYouTube_Video *uploadedVideo;
    GTLRServiceTicket *ticket = [service executeQuery:query
                                     completionHandler:^(GTLRServiceTicket *ticket, GTLRYouTube_Video *video, NSError *error) {
        if (error) {
            // Error
        }
        else {
            // Successful
            uploadedVideo = video;
        }
    }];
}

This method creates a GTLRYouTube_Video object, which is used to upload the video to Youtube. Once the upload is successful, the completionHandler block is called, where you can perform any additional tasks.

Conclusion

In this article, we explored what Objective-C is, how to authenticate your user, retrieve channel information, and upload videos to Youtube using the Objective-C programming language. With this knowledge, you can now confidently integrate Youtube APIs into your Objective-C applications!