Recipe

To help the user send a Tweet using MonoTouch.Twitter:

1. First check if they have the capability to Tweet:

if (TWTweetComposeViewController.CanSendTweet) {
    // Add code below
} else {
    // Show a message: Twitter may not be configured in Settings
}

2. Create a TWTweetComposeViewController with the suggested text for the tweet (the user will be able to edit this):

var tweet = new TWTweetComposeViewController();
tweet.SetInitialText ("Tweeting from my iOS app");

3. Add a handler that is called after the user has either sent or cancelled the tweet.

tweet.SetCompletionHandler((TWTweetComposeViewControllerResult r) =>{
    DismissModalViewControllerAnimated(true); // hides the tweet
    if (r == TWTweetComposeViewControllerResult.Cancelled) {
        // user cancelled the tweet
    } else {
        // user sent the tweet (they may have edited it first)
    }
});

4. Display the tweet so the user can view, edit and send or cancel.

PresentModalViewController(tweet, true);

Additional Information

Before a tweet can be sent from within an app, the user must configure their Twitter account in Settings.

To add a link to a tweet, call AddUrl:

tweet.AddUrl (new USUrl("http://xamarin.com"));

To add an image to a tweet, call AddImage:

tweet.AddImage (UIImage.FromFile("some_image.png"));