How can my iPhone Objective-C code get notified of Javascript errors in a UIWebView?

Question

I need to have my iPhone Objective-C code catch Javascript errors in a UIWebView. That includes uncaught exceptions, syntax errors when loading files, undefined variable re

Answer 1

First setup WebViewJavascriptBridge , then override console.error function.

In javascript

    window.originConsoleError = console.error;
    console.error = (msg) => {
        window.originConsoleError(msg);
        bridge.callHandler("sendConsoleLogToNative", {
            action:action,
            message:message
        }, null)
    };

In Objective-C

[self.bridge registerHandler:@"sendConsoleLogToNative" handler:^(id data, WVJBResponseCallback responseCallback) {
    NSString *action = data[@"action"];
    NSString *msg = data[@"message"];
    if (isStringValid(action)){
        if ([@"console.error" isEqualToString:action]){
            NSLog(@"JS error :%@",msg);
        }
    }
}];