Скачать или смотреть How to Transfer this.state Value Between Components in React Native

A step-by-step guide on how to synchronize `this.state` values between components in React Native using props. Learn how to pass state values from `ProductListScreen` to `ProductScreen`.
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How to Transfer this.state Value Between Components in React Native

When developing applications using React Native, you often need to share data between components. A common scenario is to synchronize state values, especially when you want to reflect changes across different screens or components in your app. In this guide, we will explore how to easily transfer a state value from a ProductListScreen component to a ProductScreen component.

The Challenge

The problem you are facing is to synchronize the checkList variable in the ProductListScreen state with the checkList in the ProductScreen. This is essential when you want actions taken in one component to affect the state of another. Let’s break down the solution to efficiently achieve this synchronization.

Solution Overview

Step 1: Passing State via Props

To transfer the state value, you will need to pass it as props from ProductListScreen to ProductScreen. By using props, you can share data between parent and child components in React Native.

Step 2: Update and Render the Components

Let’s rewrite the component codes for both screens to effectively pass the state value and update it when necessary.

Updated ProductListScreen

Here is the implementation of the ProductListScreen:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of ProductListScreen

State Initialization: The component initializes with an empty checkList.

Update Method: The updateValue method is defined to modify the checkList state.

Render Method: In the render method, we pass both checkList and updateCheckList as props to ProductScreen.

Updated ProductScreen

Now, let's define the ProductScreen component:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of ProductScreen

Props Access: ProductScreen accesses the checkList and updateCheckList methods through props.

Render Method: The component displays the current checkList value and includes a button to trigger the updateCheckList method.

Conclusion

By following the steps outlined above, you've successfully synchronized the state between ProductListScreen and ProductScreen. This pattern of passing state values through props and allowing components to communicate is fundamental in React and React Native development.

As you continue building your applications, consider how state management can be handled efficiently between components. Happy coding!