Complete table view controller with XML

Question

Hello, I'm from Brazil and am new to ios.
Today I am making an example where I use a table view controller and fill it witharray (NSMutableArray).
However I would do the same using XML so that now, I'm having so many difficulties to the point of not knowing where to start.
The code I use to populate this array was.
It is possible to use something like XML?
#pragma mark - View lifecycle
- (void)viewDidLoad
    [super viewDidLoad];
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    registros = [NSMutableArray arrayWithObjects:@"1", @"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14", nil];
- (void)viewDidUnload
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
- (void)viewWillAppear:(BOOL)animated
    [super viewWillAppear:animated];
- (void)viewDidAppear:(BOOL)animated
    [super viewDidAppear:animated];
- (void)viewWillDisappear:(BOOL)animated
    [super viewWillDisappear:animated];
- (void)viewDidDisappear:(BOOL)animated
    [super viewDidDisappear:animated];
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
    // Return the number of sections.
    return 1;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    // Return the number of rows in the section.
    return [registros count];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    static NSString *CellIdentifier = @"listax";//este é o identificador da celula
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    cell.textLabel.text = [registros objectAtIndex:indexPath.row];
    return cell;

Answer 1

If you have a custom XML schema (not a plist), consider two approaches.
1. Before showing your table view, use NSXMLParserto deserialize the XML document into an NSMutableArray that will be the table view data source.  Typically the array contains custom class instances; one or more class properties are used to set table cell properties in cellForRowAtIndexPath.  If you have never worked with NSXMLParser (or any other SAX parser) before, start by creating a sample app so you understand how that works.
2. Use a 3rd-party DOM parser like GDataXML.  Load your XML document into a class property in your table view's viewDidLoad.  Then the XML document will be the table view data source since elements and attributes can be directly queried using XPath in cellForRowAtIndexPath.  If you have never worked with XML DOM and XPath before, start by creating a sample app so you understand how that works.
If your have a lengthy complex XML document, option #1 might be more efficient because indexed array access is faster than XPath queries.  Theoretically that is why Apple's Cocoa provides DOM support on OS X but not iOS.  There are strategies to improve efficiency if necessary, including your own indexing scheme.  The best solution depends on many factors.  For example, if your XML document includes thousands of rows, but users rarely scroll past the first 10, option #1 would waste time parsing everything.
Both of these approaches keep all data in memory, which is fast but not friendly.  Perfectly fine for reasonably sized data sets.