It happens that when the keyboard is activated, it seems to be placed over my view and this hides the input.
render() {
return (<KeyboardAvoidingView
style={styles.container}
behavior='position'
keyboardVerticalOffset={32}>
{... tu vista ...}
</KeyboardAvoidingView>);
}
and to me it works well you can play with the keyboardVerticalOffset with positive or negative numbers as it suits you