Question

The goal of my application is to parse some XML, display one element of the xml in a tableview and then have the user click on the cell, and it pushes to a new table view where the rest of the data for that element is displayed. The first table view that displays only the list works fine, but for some reason I can’t get the push to a new view controller to work. Below is the code I am using. The first view controller displays in a table view; currentCallType. I wan the user to be be able to click on that table cell, then push to a new table view where it displays the units, station and location. Any help would be AWESOME! thanks.

View controller for first tableview:

#import "ThirdViewController.h"
#import "UnitsXMLParser.h"
#import "DetailViewController"

@implementation ThirdViewController
@synthesize unitsTableView;
@synthesize currentCallType, station, location, units;

XMLParser1 *xmlParser;

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}

#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [[xmlParser units] count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath         *)indexPath
{

static NSString *CellIdentifier = @"Cell";

Units *currentCall = [[xmlParser units] objectAtIndex:indexPath.row];

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                   reuseIdentifier:CellIdentifier];

}

// Set up the cell...
cell.textLabel.text = [currentCall currentCallType];

return cell;

}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 55;
}

#pragma mark -
#pragma mark Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath     *)indexPath {


DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:@"detail"];
    [self.navigationController pushViewController:detail animated:YES];

}


#pragma mark - View lifecycle

- (void)viewDidLoad
{
[super viewDidLoad];

xmlParser = [[XMLParser1 alloc] loadXMLByURL:@"http://localhost:8888/units.xml"];

}

XML Parser:

#import <Foundation/Foundation.h>
#import "UnitsXMLParser.h"

@implementation XMLParser1
@synthesize units = _units;


NSMutableString *currentNodeContent;
NSXMLParser     *parser;
Units       *currentCall;
bool            isStatus;

-(id) loadXMLByURL:(NSString *)urlString
{
_units          = [[NSMutableArray alloc] init];
NSURL *url      = [NSURL URLWithString:urlString];
NSData  *data   = [[NSData alloc] initWithContentsOfURL:url];
parser          = [[NSXMLParser alloc] initWithData:data];
parser.delegate = self;
[parser parse];
return self;
}

- (void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
currentNodeContent = (NSMutableString *) [string     stringByReplacingOccurrencesOfString:@"~" withString:@""];
}

- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementname isEqualToString:@"station"])
{
    currentCall = [Units alloc];
    isStatus = YES;
}
}

- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementname namespaceURI:    (NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if (isStatus)
{
    if ([elementname isEqualToString:@"units"])
    {
        currentCall.units = currentNodeContent;
    }
    if ([elementname isEqualToString:@"name"])
    {
        currentCall.currentCallType = currentNodeContent;
    }
    if ([elementname isEqualToString:@"stationid"])
    {
        currentCall.station = currentNodeContent;
    }
    if ([elementname isEqualToString:@"address"])
    {
        currentCall.location = currentNodeContent;
    }
}
if ([elementname isEqualToString:@"station"])
{
    [self.units addObject:currentCall];
    currentCall = nil;
    currentNodeContent = nil;
}
}
@end

Answer 1

A longshot; but do you have your project configured to use a UINavigationController ? Your view controllers will not be contained in / managed by a UINavigationController unless you start with the correct project template or manually add the UINavigationController . If the view controller containing your posted code is not backed by a navigation controller, [self.navigationController pushViewController:detail animated:YES] will do nothing.

Also, make sure that you have hooked up your UITableViewDelegate in addition to your UITableViewDataSource , so that your code will catch the row selection.

I only ask because you do not explicitly state that you have set up your project to use a UINavigationController or confirm that you have hooked up both the delegate and datasource in Interface Builder.