Twitter has today updated its iOS App for iPhone and iPad, bringing with it improved search capability that include topic and user suggestions based on search terms, as well as the most popular tweets from trending events.

This update includes enhancements to search and other improvements.

-As you search you’ll see more topic and user suggestions for your query, based on what’s happening in real time. You’ll also see these suggestions when adding a hashtag or username as you compose a new Tweet.

-Top Tweets from big moments in the past pop out when you search for a given term. For example, searching for “election” might highlight Tweets from several months ago.

-When you open a web page you can now see the related Tweet for more context. Just pull the tray icon up or down to see or hide the Tweet.

-It’s easier to see long conversations in the Tweet details view, which now shows all of the replies to any Tweet

-When you block a user in the app, their Tweets will instantly disappear from the Connect tab in the app

-Pull-to-refresh in Discover shows a new, smoother animation

-Support for traditional Chinese

-Logout support (iOS 6 only)

-Uploading videos vie Mobypicture, Vodpod and Posterous is no longer supported

-Additional bug fixes and improvements

Twitter has also removed support for various video services from Vodpod, Mobypicture, and Posterous, which leaves only Twitpic as the remaining video uploading service for the iOS application.

As Twitter continues to tighten down it’s services to limit 3rd party functionality, the pressure is increasing for Twitter to add functionality to its own App. This update is a step in the right direction, but there is definitely room left for improvement for the iOS App.

You can download Twitter for iOS for iPad and iPhone for free here.