javascript - How to log errors to XCode with JavaScriptCore? -

i have project uses javascriptcore communicate between webview , objective c. works well, except seem unable log runtime errors xcode console.

i have following:

- (void)createwebviewcontext {     //find context     self.webviewcontext = [self.webview valueforkeypath:@"documentview.webview.mainframe.javascriptcontext"];      //register js error handler     self.webviewcontext.exceptionhandler = ^(jscontext *c, jsvalue *e) {         dispatch_async(dispatch_get_main_queue(), ^{             nslog(@"javascript error: %@. stack: %@", e, [e valueforproperty:@"stack"]);         });     };      //attach logger     id logger = ^(nsstring *logmessage) {         nslog(@"%@", logmessage);     };     self.webviewcontext[@"console"][@"log"]   = logger;     self.webviewcontext[@"console"][@"info"]  = logger;     self.webviewcontext[@"console"][@"error"] = logger;     self.webviewcontext[@"console"][@"err"] = logger;     self.webviewcontext[@"console"][@"warn"]  = logger; } 

this code seem work - if console.log or console.err something, output in xcode. problem not errors thrown javascript (such syntaxerrors, typeerrors or similar). these kinds of errors still show in safari inspector, not in xcode.

any way achieve this?

hm, try check webviewcontext.exception property, maybe work.

additionally make sure catch errors in window object. like:

[self.webviewcontext evaluatescript:@"window.onerror = function(msg) { console.err(msg)}"] 

after errors should forwarded console.err handler