Objective C iOS NSXMLParser does not support reentrant parsing

JDP

iOS8後會碰到 NSXMLParser does not support reentrant parsing 的問題，造成錯誤無法執行。

只要使用 dispatch_queue 另開Thread去執行parse即可解決：
            dispatch_queue_t reentrantAvoidanceQueue = dispatch_queue_create("reentrantAvoidanceQueue", DISPATCH_QUEUE_SERIAL);
            dispatch_async(reentrantAvoidanceQueue, ^{
            self._tmpXMLString = [[NSMutableString alloc] init];
            xmlParserS = [[NSXMLParser alloc]initWithData:[request responseData]];
            xmlParserS.delegate = self;
            [xmlParserS parse];
            });
            dispatch_sync(reentrantAvoidanceQueue, ^{ });

Reference:
http://www.4byte.cn/question/238 ... ntrant-parsing.html
http://www.bubuko.com/infodetail-567603.html