function blurTextInput(textFieldID: ?number) {
  if (currentlyFocusedID === textFieldID && textFieldID !== null) {
    currentlyFocusedID = null;
    if (Platform.OS === "ios" || Platform.OS === "dom") {
      UIManager.blur(textFieldID);
    } else if (Platform.OS === "android") {
      UIManager.dispatchViewManagerCommand(
        textFieldID,
        UIManager.AndroidTextInput.Commands.blurTextInput,
        null
      );
    }
  }
}
@param {number} textFieldID id of the text field to unfocus
Unfocuses the specified text field
noop if it wasn't focused