iPhone delegation bug - ios

Question

I've got 2 views. The firstView and the secondView. The firstView needs the favourites array from the secondView, so I try to call the getFavourites method defined in the protocol. This returns null however, which seems strange to me because everything makes sense.
Here is the firstViewController.h:
#import <UIKit/UIKit.h>
#import "Drink.h"
#protocol firstViewControllerDelegate;
#interface FirstViewController : UIViewController
{
id <firstViewControllerDelegate> delegate;
NSMutableArray *labels;
UIButton *button1;
UIButton *button2;
UIButton *button3;
UIButton *button4;
}
- (IBAction) buttonClick: (id) sender;
#property (nonatomic, assign) id <firstViewControllerDelegate> delegate;
#property (nonatomic, retain) IBOutlet UIButton *button1;
#property (nonatomic, retain) IBOutlet UIButton *button2;
#property (nonatomic, retain) IBOutlet UIButton *button3;
#property (nonatomic, retain) IBOutlet UIButton *button4;
#end
#protocol firstViewControllerDelegate
- (NSMutableArray *) getFavourites;
- (void) setFavourites: NSMutableArray;
#end
firstViewController.m
#synthesize delegate;
.......
- (void) viewWillAppear:(BOOL)animated
{
NSMutableArray *favourites = [delegate getFavourites]; // favourites is empty after this line
[button1 setTitle:[[favourites objectAtIndex:1] name] forState:UIControlStateNormal];
NSLog(#"VIEW APPEARED. BUTTON TITLE IS: %#", button1.currentTitle);
}
SecondViewController.h
#import <UIKit/UIKit.h>
#import "FirstViewController.h"
#interface SecondViewController: UIViewController <UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate, firstViewControllerDelegate>
{
NSMutableArray *favourites;
NSMutableArray *drinks;
}
#property (nonatomic, retain) NSMutableArray *drinks;
#property (nonatomic, retain, getter = getFavourites) NSMutableArray *favourites;
- (void) addDrink: (NSString *) name;
#end
Does anybody have any idea why this isn't working?

Answer 1

Are you sure you're setting the delegate property of FirstViewController? i.e.:
FirstViewController *firstController = // Instantiate the controller;
firstController.delegate = secondController;
[self.navigationController pushViewController:firstController animated:YES];
secondController should exist before instantiation, otherwise you're setting a nil value