React Native comes with WebView component, which uses UIWebView on iOS. This component uses WKWebView introduced in iOS 8 with all the performance boost. Deployment Target >= iOS 8.0 is required (which is React Native's current minimum deployment target anyway).
Alternative #1
- Install from npm (note the postfix in the package name):
npm install react-native-wkwebview-reborn
- In the XCode's "Project navigator", right click on your project's Libraries folder ➜ Add Files to <...>
- Go to node_modules ➜ react-native-wkwebview ➜ ios ➜ select RCTWKWebView.xcodeproj
- Go your build target ➜ Build Phases ➜ Link Binary With Libraries, click "+" and select libRCTWkWebView.a (see the following screenshot for reference)
- Compile and profit (Remember to set Minimum Deployment Target = 8.0)
Alternative #2
- Install from npm (note the postfix in the package name):
npm install react-native-wkwebview-reborn
- run
rnpm link
import WKWebView from 'react-native-wkwebview-reborn';
Try replacing your existing WebView
with WKWebView
and it should work in most cases.
If your React Native < 0.40, please user 0.x.x versions.
WKWebView aims to be a drop-in replacement for UIWebView. However, some legacy UIWebView properties are not supported.
- onProgress
A callback to get the loading progress of WKWebView. Derived from estimatedProgress
property.
<WKWebView onProgress={(progress) => console.log(progress)} />
progress
is a double between 0 and 1.
- openNewWindowInWebView
If set to true, links with target="_blank"
or window.open
will be opened in the current webview, not in Safari. Default is false.
- sendCookies
Set sendCookies
to true to copy cookies from sharedHTTPCookieStorage
when calling loadRequest. This emulates the behavior of react-native's WebView
component. You can set cookies using react-native-cookies
Default is false.
- source={{file: '', allowingReadAccessToURL: '' }}
This allows WKWebView loads a local HTML file. Please note the underlying API is only introduced in iOS 9+. So in iOS 8, it will simple ignores these two properties. It allows you to provide a fallback URL for iOS 8 users.
<WKWebView source={{ file: RNFS.MainBundlePath + '/data/index.html', allowingReadAccessToURL: RNFS.MainBundlePath }} />
- userAgent="MyUserAgent" (or customUserAgent="...")
Set a custom user agent for WKWebView. Note this only works on iOS 9+. Previous version will simply ignore this props.
- hideKeyboardAccessoryView
This will hide the keyboard accessory view (<
>
and Done
). Default is false.
- allowsLinkPreview
A Boolean value that determines whether pressing on a link displays a preview of the destination for the link. This props is available on devices that support 3D Touch. In iOS 10 and later, the default value is true; before that, the default value is false.
- onMessage
This utilizes the message handlers in WKWebView and allows you to post message from webview to React Native. For example:
<WKWebView onMessage={(e) => console.log(e)} />
Then in your webview, you can post message to React Native using
window.webkit.messageHandlers.reactNative.postMessage({data: 'hello!'});
Then your React Native should have
{name: 'reactNative', body: {data: 'hello!'}}
The data serialization flow is as follows:
JS — (via WKWebView) --> ObjC --- (via React Native Bridge) ---> JS
So I recommend to keep your data simple and JSON-friendly.
There is a evaluateJavaScript
method on WKWebView, which does exactly what its name suggests. To send message from React Native to WebView,
you can define a callback method on your WebView:
window.receivedMessageFromReactNative = function(data) {
// Code here
console.log(data);
}
Then you can send message from React Native with this method call:
// <WKWebView ref={ref => { this.webview = ref; }} />
this.webview.evaluateJavaScript('receivedMessageFromReactNative("Hello from the other side.")');
- automaticallyAdjustContentInsets
- contentInset
- html (deprecated)
- injectedJavaScript
- onError
- onLoad
- onLoadEnd
- onLoadStart
- onNavigationStateChange
- renderError
- renderLoading
- source
- startInLoadingState
- style
- url (deprecated)
- bounces
- onShouldStartLoadWithRequest
- pagingEnabled
- scrollEnabled
- directionalLockEnabled
- mediaPlaybackRequiresUserAction
- scalesPageToFit
- domStorageEnabled
- javaScriptEnabled
- allowsInlineMediaPlayback
- decelerationRate
If you look at the source, the JavaScript side is mostly derived from React Native's WebView. The Objective C side mostly deals with the API difference between UIWebView and WKWebView.
We battle test this component against our app. However, we haven't use all the props so if something does not work as expected, please open an issue or PR.