How to pass data between child and parent in react-native?

Question

module.exports= class APP extends React.Component {
  constructor(props){
    super(props);
    this.state = {
      key1:\'key1\',
      key2:\'key2\'
    };
  rend         


        

Answer 1

class Parent extends Component{
   constructor(props){
   super(props);
    this.state={value:''};
    this.getData=this.getData.bind(this);
  }

  getData(val){
   console.log(val);
  this.setState({
    value:val
  });
  }
    render(){
      const {value}=this.state
    return(
      
      
      
        
    {this.state.value};
    
      
      
    )
    }
}
export default Parent;


CHILD CLASS:

class Child extends Component{
   componentWillMount(){
    this.props.sendData('data');
   }
    render(){ 
    return(
          
       
    )
    }  
}
export default Child;