![]() ![]() The main drawback of cross-language properties is that they do not support callbacks, which would allow us to handle bottom-up data bindings. In short, export properties with RCT_CUSTOM_VIEW_PROPERTY macro in your custom native component, then use them in React Native as if the component was an ordinary React Native component. The problem exposing properties of native components is covered in detail in this article. ![]() Passing properties from React Native to native We suggest that you build it into your own wrapper instead. There is no way to update only a few properties at a time. The dictionary is internally converted into a JSON object that the top-level JS component can reference.Ĭurrently, there is a known issue where setting appProperties during the bridge startup, the change can be lost. The initialProperties parameter has to be an instance of NSDictionary. RCTRootView has an initializer that allows you to pass arbitrary properties down to the React Native app. It also provides an interface between native side and the hosted app. RCTRootView is a UIView that holds a React Native app. In order to embed a React Native view in a native component, we use RCTRootView. Passing properties from native to React Native So we need a way to pass properties both from native to React Native, and from React Native to native. Properties are the most straightforward way of cross-component communication. But, when we mix React Native and native components, we need some specific, cross-language mechanisms that would allow us to pass information between them. As long as we are building our application purely within the framework, we can drive our app with properties and callbacks. The same concept applies to React Native. If an ancestor component relies on the state of its descendant, one should pass down a callback to be used by the descendant to update the ancestor. We do this with properties: data is passed from a parent to its children in a top-down manner. We maintain a hierarchy of components, in which each component depends only on its parent and its own internal state. React Native is inspired by React, so the basic idea of the information flow is similar. This article summarizes available techniques. Some ways to achieve that have been already mentioned in other guides. When we mix native and React Native components, we'll eventually find a need to communicate between these two worlds. In Integrating with Existing Apps guide and Native UI Components guide we learn how to embed React Native in a native component and vice versa. Communication between native and React Native ![]()
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