use ref in functional component react native code example

Example 1: use ref in component reactjs

function MyFunctionComponent() {  return <input />;
}

class Parent extends React.Component {
  constructor(props) {
    super(props);
    this.textInput = React.createRef();  }
  render() {
    // Ça ne fonctionnera pas !
    return (
      <MyFunctionComponent ref={this.textInput} />    );
  }
}

Example 2: use ref in component reactjs

function CustomTextInput(props) {
  return (
    <div>
      <input ref={props.inputRef} />    </div>
  );
}

class Parent extends React.Component {
  render() {
    return (
      <CustomTextInput
        inputRef={el => this.inputElement = el}      />
    );
  }
}

Example 3: use ref in component reactjs

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.myRef = React.createRef();  }
  render() {
    return <div ref={this.myRef} />;  }
}