Passing value from one class to another, using #property - objective-c

Question

I have been pulling my hair out all afternoon trying to figure out why the following code will not work. All I am trying to do is pass a string, from one class to another.
In my FirstDetailViewController.h file I declare the NSString
#property(nonatomic, retain) NSString *infoForArray;
And then in my Grinding01_DetailViewController.m I try to set a value for the string
#import "Grinding01_DetailViewController.h"
#import "FirstDetailViewController.h"
#implementation Grinding01_DetailViewController
...
NSString *didLoadMessage = #"Grinding01 Loaded";
FirstDetailViewController *temp = [[FirstDetailViewController alloc] initWithNibName:#"FirstDetailView" bundle:nil];
temp.infoForArray = didLoadMessage;
[self.navigationController pushViewController:temp animated:YES];
}
When I output the infoForArray from the FirstDetailViewController.h it is null.
Any help would be appreciated, I think there's a simple step that I am missing, but I just can't see it.
EDIT: Here is the code from the FirstDetailViewController
FirstDetailViewController.h
#import <UIKit/UIKit.h>
#import "Protocols.h"
#interface FirstDetailViewController : UIViewController <SubstitutableDetailViewController> {
//for the output
IBOutlet UITextView *outputView;
UIToolbar *navigationBar;
NSMutableArray *logMessages;
}
#property (nonatomic, retain) IBOutlet UIToolbar *navigationBar;
//for incoming messages
#property(nonatomic, retain) NSString *infoForArray;
#end
FirstDetailViewController.m
#import "FirstDetailViewController.h"
#implementation FirstDetailViewController
#synthesize navigationBar, infoForArray;
-(void)viewDidLoad{
[super viewDidLoad];
//The log cannot be changed
outputView.editable = NO;
}
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidUnload {
[super viewDidUnload];
self.navigationBar = nil;
}
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:YES];
NSLog(#"message: %#", infoForArray);
outputView.text = infoForArray;
}
#pragma mark -
#pragma mark Managing the popover
- (void)showRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
// Add the popover button to the toolbar.
NSMutableArray *itemsArray = [navigationBar.items mutableCopy];
[itemsArray insertObject:barButtonItem atIndex:0];
[navigationBar setItems:itemsArray animated:NO];
[itemsArray release];
}
- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
// Remove the popover button from the toolbar.
NSMutableArray *itemsArray = [navigationBar.items mutableCopy];
[itemsArray removeObject:barButtonItem];
[navigationBar setItems:itemsArray animated:NO];
[itemsArray release];
}
#pragma mark -
#pragma mark Rotation support
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
#pragma mark -
#pragma mark Memory management
- (void)dealloc {
[navigationBar release];
[super dealloc];
}
#end

Answer 1

It sounds like the trouble area is in in FirstDetailViewController. I would suggest posting the code for that so we can see what's going on.

Answer 2

my guess is you are checking for infoForArray somewhere in the instantiation process of FirstDetailViewController, which occurs before you set temp.infoForArray = didLoadMessage.
Just for reference, if you check for infoForArray in viewDidLoad that will be too early. viewDidLoad is triggered when the view is put into memory. What you want is viewDidAppear, which you may have to add yourself