Parsing XML File in Objective-C - ios

Question

I have xml file which I have to parse it. I'm following a youtube tutorials for it. I'm showing the parsed data from tags in a table view controller, But when i run the app no data is shown there, the table view controller is just empty. My code for parsing the file is this,
#import "QuestionParser.h"
#import "Question.h"
#interface QuestionParser()
#property NSXMLParser *parser;
#property NSString *element;
#property NSString *currentxref;
#property NSString *currenttext;
#property NSString *currentprompt;
#property NSString *currentexplanation;
#property NSString *currenttext1;
-(id)initWithArray:(NSMutableArray *)questionArray{
self = [super init];
if (self) {
self.questionArray = questionArray;
}
return self;
}
-(void)parseFile{
NSURL *url= [[NSBundle mainBundle]URLForResource:#"test" withExtension:#"xml"];
self.parser = [[NSXMLParser alloc]initWithContentsOfURL:url];
self.parser.delegate=self;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
attributes:(NSDictionary<NSString *,NSString *> *)attributeDict{
self.element = elementName;
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
if ([self.element isEqualToString:#"xref"]) {
self.currentxref = string;
}
else if ([self.element isEqualToString:#"text"]){
self.currenttext = string;
}
else if ([self.element isEqualToString:#"prompt"]){
self.currentprompt = string;
}
else if ([self.element isEqualToString:#"explanation"]){
self.currentexplanation = string;
}
else if ([self.element isEqualToString:#"text"]){
self.currenttext1 = string;
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
if ([elementName isEqualToString:#"question"]) {
Question *ques= [[Question alloc]initWithName:_currentxref text:_currenttext prompt:_currentprompt explanation:_currentexplanation text1:_currenttext1];
[self.questionArray addObject:ques];
}
self.element = nil;
}
This is how I'm loading data in datasource,
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.questionArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell" forIndexPath:indexPath];
Question *ques=self.questionArray[indexPath.row];
cell.textLabel.text=ques.xref;
cell.detailTextLabel.text = [NSString stringWithFormat:#"%#",ques.prompt];
return cell;
}
My xml file is this,

Answer 1

This method will execute after complete XML parsing. In this method reload the table view data.
-(void)parserDidEndDocument:(NSXMLParser *)parser{
// When the parsing has been finished then simply reload the table view.
[self.tableView reloadData];
}
If you want anything please follow this tutorial: https://www.appcoda.com/parse-xml-and-json-web-service/