After having upgraded React Native to 0.62.2, it got the following error:
JSON value '1' of type NSNumber cannot be converted to NSString
TL;DR
- Check your callstack
- Check if you pass prop value wrong
- In my case, I was passing boolean value instead of string
Callstack
Look into variable contents at 13rd stack:
Most props are YES of boolean type for some reason. Weird.
It looks like it's WebView component:
The error happens when processing allowingReadAccessToURL:
allowingReadAccessToURL should be string
The error message was right.
allowingReadAccessToURL expects String:
RCT_EXPORT_VIEW_PROPERTY(allowingReadAccessToURL, NSString)
in RNCWebView.m of react-native-webview:
- (void)visitSource
{
// Check for a static html source first
NSString *html = [RCTConvert NSString:_source[@"html"]];
if (html) {
NSURL *baseURL = [RCTConvert NSURL:_source[@"baseUrl"]];
if (!baseURL) {
baseURL = [NSURL URLWithString:@"about:blank"];
}
[_webView loadHTMLString:html baseURL:baseURL];
return;
}
NSURLRequest *request = [self requestForSource:_source];
// Because of the way React works, as pages redirect, we actually end up
// passing the redirect urls back here, so we ignore them if trying to load
// the same url. We'll expose a call to 'reload' to allow a user to load
// the existing page.
if ([request.URL isEqual:_webView.URL]) {
return;
}
if (!request.URL) {
// Clear the webview
[_webView loadHTMLString:@"" baseURL:nil];
return;
}
if (request.URL.host) {
[_webView loadRequest:request];
}
else {
NSURL* readAccessUrl = _allowingReadAccessToURL ? [RCTConvert NSURL:_allowingReadAccessToURL] : request.URL;
[_webView loadFileURL:request.URL allowingReadAccessToURL:readAccessUrl];
}
}
- Related pull request: Add prop for allowingReadAccessToURL on iOS WKWebView by hsource · Pull Request #771 · react-native-community/react-native-webview
So, it looks like I'm using it wrong:
return (
<WebView
ref={webViewRef}
source={source}
originWhitelist={['*']}
style={[styles.webView]}
startInLoadingState
hideKeyboardAccessoryView
allowUniversalAccessFromFileURLs
allowingReadAccessToURL
onMessage={handleMessageFromWebView}
onLoadEnd={handleWebViewLoad}
/>
)
It should be URL or something, according to the doc:
A String value that indicates which URLs the WebView's file can then reference in scripts, AJAX requests, and CSS imports. This is only used in for WebViews that are loaded with a source.uri set to a
'file://'URL. If not provided, the default is to only allow read access to the URL provided in source.uri itself.
So, the fix for my case would be:
diff --git a/src/components/mde-webview-bridge.js b/src/components/mde-webview-bridge.js
index 9ff7894..2401e5e 100644
--- a/src/components/mde-webview-bridge.js
+++ b/src/components/mde-webview-bridge.js
@@ -39,6 +39,9 @@ const MDEWebViewBridge = (props: Props) => {
? `file://${MainBundlePath.bundlePath}/webeditor/index.html`
: 'file:///android_asset/webeditor/index.html'
}
+ const allowingReadAccessToURL = isIOS()
+ ? `file://${MainBundlePath.bundlePath}/webeditor/`
+ : 'file:///android_asset/webeditor/'
const sendMessageToWebView = useCallback(
(message: BridgeMessage) => {
@@ -273,7 +276,7 @@ const MDEWebViewBridge = (props: Props) => {
startInLoadingState
hideKeyboardAccessoryView
allowUniversalAccessFromFileURLs
- allowingReadAccessToURL
+ allowingReadAccessToURL={allowingReadAccessToURL}
onMessage={handleMessageFromWebView}
onLoadEnd={handleWebViewLoad}
/>
Okay, now it works fine!
Top comments (1)
very helpful thank you!