I'm sure you have seen a Twitter client such as Twittelator Pro or Tweetie 2 count down the characters as you type your Tweet. This is done by responding to the Editing Changed action on a UITextField.
Today, I will show you how you can implement this functionality in your application as well as show you some other real world examples of responding to this action. Here are a few of the uses that we will discuss:
- Countdown of characters allowed - Used when the user is limited by a certain number of characters
- Word filter - useful in filtering out swear words or other unwanted text
- Live translator - our example will translate english to 1337 :)
I will create the core code and show you how to modify it slightly to implement the other 2 applications.
iPhone Coding Recipe – Shortening URLs