React Native TextInput that only accepts numeric characters

Question

I need to have a React Native TextInput component that will only allow numeric characters (0 - 9) to be entered. I can set the keyboardType to

Answer 1

I had the same problem in iOS, using the onChangeText event to update the value of the text typed by the user I was not being able to update the value of the TextInput, so the user would still see the non numeric characters that he typed.

This was because, when a non numeric character was pressed the state would not change since this.setState would be using the same number (the number that remained after removing the non numeric characters) and then the TextInput would not re render.

The only way I found to solve this was to use the keyPress event which happens before the onChangeText event, and in it, use setState to change the value of the state to another, completely different, forcing the re render when the onChangeText event was called. Not very happy with this but it worked.