With generateProps.js

class MyContainer extends Component {
  state = {
    itemA: 'something',
    itemB: 'another thing'
  }

  _onPress = () => {
    // ...
  }
  
  _onPinch = () => {
    // ...
  }
  
  _generateProps = () => ({
    ...this.props,
    ...this.state,
    onPress: this._onPress,
    onPinch: this._onPinch
  })
  
  render () {
    const props = this._generateProps()
    return (
      <MyComponent {...props} />
    )
  }
}