iphone - Navigating between UITextFields?

I have seen a lot of iphone apps which provide an easy to use navigation controll for text fields, which contains next previous and done.

1. What is the technique for this? any sample code?
2. the开发者_高级运维y also scroll the screen until the selected textField is placed on top of the keyboard, how do they do that?

Sorry I don't have direct answers, these are the best I could find off the top of my head:

For 1, take a look at first responders, it seems to be what you're looking for.

For 2, you will have to make it manually. See this article.