The RN input box defaults to a numeric keyboard

<TextInput keyboardType="numeric"/>

keyboardType

Decide what type of soft keyboard pops up, for example numeric(pure number keyboard).

See screenshots of all the types here.

These values ​​are available on all platforms:

• default
• number-pad
• decimal-pad
• numeric
• email-address
• phone-pad

The following values ​​are only available for iOS:

• ascii-capable
• numbers-and-punctuation
• url
• name-phone-pad
• twitter
• web-search

The following values ​​are only available for Android:

• visible-password

 

Reference link:

https://www.reactnative.cn/docs/textinput#keyboardtype

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