gistfile1.txt

        NSLog(@"DEBUG ------");
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog(@"`dispatch_get_main_queue`");
            if (_delegate != nil) {
                NSLog(@"`_delegate != nil`");
                if ([_delegate respondsToSelector:@selector(onConversionDataSuccess:)]) {
                    NSLog(@"`respondsToSelector`");
                    [_delegate performSelector:@selector(onConversionDataSuccess:) withObject:conversionDict];
                    NSLog(@"conversionDict: %@", conversionDict);
                    NSLog(@"FINISH -------");
                }
            }
        });