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Let's say I add a UITextView to my UIView , and I want it to change its background color each time the contents change. I can do this by becoming the delegate of the UITextView and implementing textViewDidChange . If I am using this behavior frequently though, it makes sense to create a UITextView subclass, which I will call ColorSwitchingTextView . It should include the color-switching behavior by default, so that any UIView can simply add it instead of a standard UITextView if it wants that behavior. How do I detect changes in the content from within my ColorSwitchingTextView class? I don't think I can do something like self.delegate = self . In summary, how can a UITextView subclass know when its contents change? EDIT It seems I can use self.delegate = self , but this means that the UIViewController that uses the ColorSwitchingTextView can not also subscribe to the notifications. Once I use switchingTextView.delegate = self in the view controller, the subclass behavior no longer works. Any workarounds? I'm trying to get a custom UITextView that otherwise works like a regular UITextView .

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