Unable to "pass data" from a UITableViewController to a UIViewController - uiviewcontroller

Question

I am in troubles :)
I am unable to acheive my project because i cannot pass the data from my UITableView to a DetailView (UIViewController)
I am a beginner so i certainly do something wrong but i don't know what. I have red several tutorials and it seems to be ok ... but it's not !
Here is the .h of my UITableViewController :
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import "XMLParser.h"
#import "ColzaDetailViewController.h"
#interface ColzaViewController : UITableViewController <XMLParserDelegate>
{
XMLParser *parser;
NSDictionary *colzaInfos;
}
#property (nonatomic, retain) NSDictionary *colzaInfos;
#end
I have create an NSDictionary to store the data I need to pass to the detailView (ColzaDetailViewController)
Here is the part of my UITalbeViewController .h wich is interresting for my problem :
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
ColzaDetailViewController *detailViewController = [[ColzaDetailViewController alloc] initWithNibName:#"ColzaDetail" bundle:[NSBundle mainBundle]];
colzaInfos = [parser.stories objectAtIndex:indexPath.row];
detailViewController._colzaInfos = colzaInfos;
[self.navigationController pushViewController:detailViewController animated:YES];
NSLog(#"TEST MainView : %#", detailViewController._colzaInfos);
detailViewController = nil;
}
I think everything is ok here. I have put a NSLog (TEST MainView) to check if there is something in my NSDictionary _colzaInfos.
So here are my .h and .m of my DetailVieuw (UIVIewController)
.h
#import <UIKit/UIKit.h>
#import "ColzaViewController.h"
#interface ColzaDetailViewController : UIViewController
{
IBOutlet UILabel *colzaSettle;
NSDictionary *_colzaInfos;
}
#property (nonatomic, strong) NSDictionary *_colzaInfos;
#property (nonatomic, retain) IBOutlet UILabel *colzaSettle;
#end
.m
#import "ColzaDetailViewController.h"
#implementation ColzaDetailViewController
#synthesize _colzaInfos, colzaSettle;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
// Implement loadView to create a view hierarchy programmatically, without using a nib.
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
colzaSettle = [_colzaInfos objectForKey:kCloture];
NSLog(#"TEST DetailView : %#", _colzaInfos);
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end
As you can see in the viewDidLoad, i have put a second NSLog (TEST DetailView) in order to check one more time if there is something in my Dictionary
And here are the log :
2012-03-14 16:23:54.240 Mobile Settles[7173:f803] TEST DetailView : (null)
2012-03-14 16:23:54.241 Mobile Settles[7173:f803] TEST MainView : {
date = "13/03/2012\n ";
echeance = "Ao\U00fbt 2012\n ";
settle = "453.25\n ";
variation = "5.75";
}
So As you can see the log for DetailView is NULL but in the MainView contains data.
But i need to get those data in the DetailView in order to display them.
The only thing it seem "strange" for me at this step is the _colzaInfos Dictionary is not alloc and init at anytime ... But i have try to allocate it and initialize it in the .m of the detailViewController but my log was at this time
TEST DetailView : {}
Someone can help me to understand what i am doing wrong.
(if you need another part of my code to check something ... feel free to ask.)
Thanks a lot for help
As you told me to do, i have put the line of code at this place, please let me know if i am wrong. And as i told in the comment, When i put a breakpoint directly in this part of code and when i Run the program, the breakpoint stop the process AFTER the NSLog. And if i try to alloc/init it before, i have nothing : TEST detailView : { }.
Sorry but it does not work :(
The code :
#implementation ColzaDetailViewController
#synthesize _colzaInfos, colzaSettle;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
if (! _colzaInfos)
_colzaInfos = [[NSDictionary alloc] init];
}
return self;
}

Answer 1

Add this to your initWithNibName method in ColzaDetailViewController.m.
if (! _colzaInfos) _colzaInfos = [[NSDictionary alloc] init];
It is same issue if you're using an NSArray. You have to initialize the variable at some point for it to be able to hold data. You've only declared it in the .h file.