问题
I have a very strange issue on iOS7.
I use standard NSXMLParser. On iOS6 everything works just fine - when XML is valid as well as when NSData is zero bytes or contains invalid bytes.
self.dataParser = [[[NSXMLParser alloc] initWithData:data] autorelease];
[self.dataParser setDelegate: self];
[self.dataParser parse];
On iOS7 parser works as expected only when it has a valid XML data. If data is zero bytes, none of the delegate methods are called.
Please help me find a direction to look to. Thanks.
UPD. All delegate methods are implemented (they work well on iOS6). I could check if data contains non-zero bytes (and data == nil), but I also must handle non-valid XML situations...
回答1:
It appears that on iOS 7 parser:parseErrorOccurred: delegate method is not being called when data is zero bytes or is not valid in UTF8 encoding.
It became a revelation to me that I don't have to use parserDidEndDocument: and parser:parseErrorOccurred: methods to detect finish of parsing, I can just check return value of parse method!
It's like I've been blind all these years :)
Big thanks to Martin R.
回答2:
You should always check if your data is OK. You should implement delegate method:
parser:parseErrorOccurred
and check what was wrong and handle an error.
In your case you only should check if(!data).
来源：https://stackoverflow.com/questions/19933094/nsxmlparser-parserparseerroroccurred-not-called-on-ios-7