Objective-C - how can separately parse attributes of my XML? - ios

Question

I'm working on an application where I use XML parsing in UITableView. I can not figure out how I'm separately parses attributes rok1 and rok2. If I use [_element isEqualToString: # "jmeno"] application works well, but it displayed to me in UITableView together rok1 and rok2 and do not want it. Thx for your help.
There is my parser code:
- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
self.element = elementName;
if ([_element isEqualToString:#"rok1"])
{
_item = [[NSMutableDictionary alloc] init];
self.nazev = [[NSMutableString alloc] init];
self.definice = [[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if ([self.element isEqualToString:#"nazev"])
{
[self.nazev appendString:string];
}
else if ([self.element isEqualToString:#"def"])
{
[self.definice appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser
didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:#"rok1"])
{
Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev
definice:self.definice];
[self.svatkyArray addObject:thisSvatek];
}
self.element = nil;
}
And example of my XML:
<?xml version="1.0" encoding="UTF-8" ?>
<menu>
<rok1>
<jmeno>
<nazev>Prvni</nazev>
<def>blblbla</def>
<jmeno>
<nazev>Druhy</nazev>
<def>blbablabal</def>
</jmeno>
</rok1>
<rok2>
<jmeno>
<nazev>Prvni</nazev>
<def>blblbla</def>
</jmeno>
</rok2>
</menu>

Answer 1

You need to keep track of your "state" as you are parsing the XML document. One simple approach is simply to add a boolean property that indicates that you are processing 'inside' the target element.
- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
self.element = elementName;
if ([elementName isEqualToString:#"rok1"])
{
self.foundTarget=YES;
self.nazev = [[NSMutableString alloc] init];
self.definice = [[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if (self.foundTarget) {
if ([self.element isEqualToString:#"nazev"])
{
[self.nazev appendString:string];
}
else if ([self.element isEqualToString:#"def"])
{
[self.definice appendString:string];
}
}
}
- (void)parser:(NSXMLParser *)parser
didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:#"rok1"])
{
Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev
definice:self.definice];
[self.svatkyArray addObject:thisSvatek];
self.foundTarget=NO;
}
self.element = nil;
}
A more sophisticated approach is to build some sort of data structure, such as a dictionary, that represents your XML
- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
self.element = elementName;
if ([elementName isEqualToString:#"rok1"] || [elementName.isEqualToString:#"rok2"])
{
self.nazev = [[NSMutableString alloc] init];
self.definice = [[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if ([self.element isEqualToString:#"nazev"])
{
[self.nazev appendString:string];
}
else if ([self.element isEqualToString:#"def"])
{
[self.definice appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser
didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:#"rok1"] || [elementName.isEqualToString:#"rok2"])
Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev
definice:self.definice];
self.rokDictionary[elementName]=thisSvatek; // self.rokDictionary is an NSMutableDictionary
}
self.element = nil;
}
To separate out the various 'jmeno' tags, you need to handle them in didStartElement & didEndElement -
- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
self.element = elementName;
if ([elementName isEqualToString:#"rok1"] || [elementName.isEqualToString:#"rok2"])
{
self.jmenoArray=[NSMutableArray new];
}
else if ([elementName isEqualToString:#"jmeno"]) {
self.nazev = [[NSMutableString alloc] init];
self.definice = [[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if ([self.element isEqualToString:#"nazev"])
{
[self.nazev appendString:string];
}
else if ([self.element isEqualToString:#"def"])
{
[self.definice appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser
didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:#"jmeno"]) {
Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev
definice:self.definice];
[self.jemnoArray addObject:thisSvatek];
}
else if ([elementName isEqualToString:#"rok1"] || [elementName.isEqualToString:#"rok2"])
self.rokDictionary[elementName]=self.jmenoArray; // self.rokDictionary is an NSMutableDictionary
self.jmenoArray=nil;
}
self.element = nil;
}