Volte para a tela com params react nativo
this.props.route.params.mycallback(data);
navigation.goBack();
Alive Antelope
this.props.route.params.mycallback(data);
navigation.goBack();handleImageData = (data) =>
{
// do whatever
}
...
navigation.navigate('ImagePickerScreen',{mycallback:this.handleImageData});