Question

iOS 5 has deep twitter integration. How can I check if the user has an account in the built-in twitter app (meaning he uses it), and then do a UIApplication openURL: to trigger following a user or pre-composing a tweet?

One of the new features for developers in the iOS 5 SDK is support for
the Twitter API. Apple has made it easy for developers to add Twitter
support to their apps and to allow users to easily control whether or
not an app has access to post to their Twitter account.

According to this site it is possible. How’s that Twitter Framework called?

Answer 1

Try this:

- (void)tweetButtonPressed:(id)sender
{
     Class tweetComposer = NSClassFromString(@"TWTweetComposeViewController");

     if( tweetComposer != nil ) {   

         if( [TWTweetComposeViewController canSendTweet] ) {
            TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init];

            [tweetViewController setInitialText:@"This is a test."];  // set your initial text

            tweetViewController.completionHandler = ^(TWTweetComposeViewControllerResult result) {
                if( result == TWTweetComposeViewControllerResultDone ) 
                {
                    // user is done with composing
                } 
                else if( result == TWTweetComposeViewControllerResultCancelled ) 
                {
                    // user has cancelled composing
                }
                [self dismissViewControllerAnimated:YES completion:nil];
            };

            [self presentViewController:tweetViewController animated:YES completion:nil];
        } 
        else {
             // The user has no account setup
        }
    }   
    else {
        // no Twitter integration
    }
}