Question

I have this code after a remote call is made and

    [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
     {   
         NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] ;
         NSString *responseError = [[NSString alloc] initWithData:error encoding:NSUTF8StringEncoding] ;
         ...

And on the last line sometimes the code crashes. I can not reproduce the crash, but one guess I have is that if the error object is nil then the crash happens, am I right? Should I check if error is not nil first?

This is the error from crashalytics:

Reason:
-[NSURLError bytes]: unrecognized selector sent to instance 0x22b215d0

which does not support my guess of why the error happens. Any idea why this crash happens?

Thanks!

Answer 1

You can’t pass an NSError object to the initWithData: method (that expects an NSData object. Most likely you are getting a compiler warning. Never ignore compiler warnings. Your code should compile clean.

To get the error message use the proper NSError method such as localizedDescription.

NSString *responseError = [error localizedDescription];