title: Disabling buttons on react native
body: <p>I'm making an android app using react native and I've used TouchableOpacity component to create buttons.<br>
  I use a text input component to accept text from the user and the button should <strong>only be enabled</strong> once the text input matches a certain string.<br>
  I can think of a way to do this by initially rendering the button without the TouchableOpactiy wrapper and re-rendering with the wrapper once the input string matches.<br>
  But I'm guessing there is a much better way to do this. Can anyone help?</p>