Problem with custom class in Objective-C - objective-c

Question

I have a little problem with the application I currenty work on. I create a simpliest project to illustrate my problem.
So, I create a "Navigate-Base Application". I add an other UITableViewController named TableViewController (the one which is created with the project is named RootViewController). I create an instance of TableViewController when I touch a line in the RootViewController.
I create a custom class named "MyCustomClass".
MyCustomClass.h (full code) :
#import <Foundation/Foundation.h>
#interface MyCustomClass : NSObject {
NSString *name;
}
#property (nonatomic, retain) NSString * name;
#end
MyCustomClass.m (full code) :
#import "MyCustomClass.h"
#implementation MyCustomClass
#dynamic name;
#end
I had a MyCustomClass attibute in TableViewController class.
TableViewController.h (full code) :
#import <UIKit/UIKit.h>
#import "MyCustomClass.h"
#interface TableViewController : UITableViewController {
MyCustomClass *aCustomObject;
}
#property (nonatomic, retain) MyCustomClass *aCustomObject;
#end
At the load of TableViewController, I try to display aCustomObject's content.
TableViewController.m (top of the file and what I modify in the template's file) :
#import "TableViewController.h"
#implementation TableViewController
#synthesize aCustomObject;
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
NSLog(#"Name : %#",self.aCustomObject.name);
}
Before, I create and give a value to aCustomObject.name in RootViewController :
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
TableViewController *detailViewController = [[TableViewController alloc] initWithNibName:#"TableViewController" bundle:nil];
detailViewController.aCustomObject.name = #"The Name";
[self.navigationController pushViewController:detailViewController animated:YES];
}
Console said :
2011-06-22 07:21:11.087
MyTestApp[12822:207] Name : (null)
I think it's a stupid thing but I don't find myself after hours of try.
Thanks a lot and excuse me for my english mistakes,

Answer 1

You forget to initialize your custom object in the tableViewController's viewDidLoad Method.
Try this.
- (void)viewDidLoad {
[super viewDidLoad];
if(aCustomObject == nil){
self.aCustomObject = [[[MyCustomClass alloc] init] autoRelease];
}
self.aCustomObject.name = #"";
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
//this will show empty here.
NSLog(#"Name : %#",self.aCustomObject.name);
}

Answer 2

You use the #dynamic keyword to tell
the compiler that you will fulfill the
API contract implied by a property
either by providing method
implementations directly or at runtime
using other mechanisms such as dynamic
loading of code or dynamic method
resolution. It suppresses the warnings
that the compiler would otherwise
generate if it can’t find suitable
implementations. You should use it
only if you know that the methods will
be available at runtime.
from Apple Documentation
You are claiming in the question that you included full source for MyCustomClass.m. Where did you implement the getter and setter for the property? If you want the compiler to generate the methods for you, you should use
#synthesize name;