Child.jsx

class Child extends Component {
  onChange() {
    this.props.onUpdate(this.inputEl.val)
  }
  
  render() {
    return (
      <div>
        <input onChange={this.onChange} value={this.props.someFoo} ref={(el) => this.inputEl = el} /> 
      </div>
    )
  }
}

Container.jsx

class Container extends Component {
  state = {
    someFoo: 1    
  }

  onUpdate(newFoo) {
    this.setState({someFoo: newFoo})
  }

  render() {
    return (
      <Child onUpdate={this.onUpdate} someFoo={this.state.someFoo} />
    )
  }
}