i tried the following one from iphone cook book .i displayed HTML content through accessing private API of UITextview like
@interface UITextView (extended)
You could try using the Three20 library, which includes a styled text label:
http://github.com/facebook/three20/
The class TTStyledTextLabel of the Three20 framework has a text property "text" of type TTStyledText. This TTStyledText class has a textFromXHTML: static method which takes an NSString with any kind of HTML text inside, and might help you do what you want. However, it does not allow editing of the text, at least not as far as I know.
Hope this helps!