要创建包含CDATA编码文本的节点,请在NSXMLNode上使用方法initWithKind:options : .
NSXMLNode *cdataNode = [[NSXMLNode alloc] initWithKind:NSXMLTextKind  options:NSXMLNodeIsCDATA];
[cdataNode setStringValue:@"<some text>"];
并将xml数据写入文件:
NSData *xmlData = [xmlDoc XMLDataWithOptions:NSXMLNodePrettyPrint];
[xmlData writeToFile:fileName atomically:YES];