It is easy to pass data through a push as seen in the example:
Actions.login({data:"Custom data", title:'Custom title' })
How should it be done when popping back to the parent?
The parent can just pass a callback function through props.
you can use Actions.refresh({data:"Custom data", title:'Custom title' }) immediately after Actions.pop() and this will do the trick. Refresh will be called on the parent
Actions.pop( {refresh: {variable: value} }) will do
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Actions.pop( {refresh: {variable: value} }) will do