react-native Refs 调用方法 的使用方式

import React, { PureComponent } from "react";
import { TouchableOpacity, View, Text, TextInput } from "react-native";

export default class Demo extends PureComponent {
  constructor(props) {
    super(props);
    this.myRef = null;
  }

  clearText = () => {
    this.myRef.setNativeProps({ text: "" }); //this.myRef.后面可调用任何组件方法
  };

  setMyRef = element => {
    this.myRef = element;
  };

  render() {
    return (
      
        
        
          Clear text
        
      
    );
  }
}