Re-render component when navigating the stack with React Navigation

问题

I am currently using react-navigation to do stack- and tab- navigation.

Is it possible to re-render a component every time the user navigates to specific screens? I want to make sure to rerun the componentDidMount() every time a specific screen is reached, so I get the latest data from the server by calling the appropriate action creator.

What strategies should I be looking at? I am pretty sure this is a common design pattern but I failed to see documented examples.

回答1:

React Navigation lifecycle events quoted from react-navigation

React Navigation emits events to screen components that subscribe to them. There are four different events that you can subscribe to: willFocus, willBlur, didFocus and didBlur. Read more about them in the API reference.

---

Let's check this out,

With navigation listeners you can add an eventlistener to you page and call a function each time your page will be focused.

const didBlurSubscription = this.props.navigation.addListener(
  'willBlur',
  payload => {
    console.debug('didBlur', payload);
  }
);

// Remove the listener when you are done
didBlurSubscription.remove();

Replace the payload function and change it with your "refresh" function.

Hope this will help.

回答2:

If you are using React Navigation 5.X, just do the following:

import { useIsFocused } from '@react-navigation/native'

export default function App(){

const isFocused = useIsFocused()

    useEffect(() => {
        //Update the state you want to be updated
    } , [isFocused])
}

回答3:

At the request of Dimitri in his comment, I will show you how you can force a re-rendering of the component, because the post leaves us with this ambiguity.

If you are looking for how to force a re-rendering on your component, just update some state (any of them), this will force a re-rendering on the component. I advise you to create a controller state, that is, when you want to force the rendering, just update that state with a random value different from the previous one.

来源：https://stackoverflow.com/questions/52805879/re-render-component-when-navigating-the-stack-with-react-navigation