How can I display the following text in UITextView by programming?

I like chocolate!
where chocolate is in ,say, red color.
I realize this is a simple problem. I have found in the document files. I just think that the NSString Class doesn't have color property.
Although the UITextView does, it doesn't have the stringByAppendingString method.
So How should I do?
Thanks a lot!!!

You only have the option to set the color of all text when using UITextView.
If you need specific control over style, formatting across text within the view etc. you'll need to move to a UIWebView.

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How can I display the following text in UITextView by programming?

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