Question

I have made a very simple NSObject:

GameSetUpData.h

@interface GameSetUpData : NSObject

@property (readwrite, nonatomic)    NSUInteger      numberOfPlayers;
@property (strong, nonatomic)       NSMutableArray  *playerNames;
@property (strong, nonatomic)       NSString        *gameType;
@property (readwrite, nonatomic)    NSUInteger      numberOfMinutes;
@property (readwrite, nonatomic)    NSUInteger      numberOfTurns;
@property (readwrite, nonatomic)    CGSize          boardSize;

@end

GameSetUpData.m

#import "GameSetUpData.h"

@implementation GameSetUpData

@synthesize numberOfPlayers = _numberOfPlayers;
@synthesize playerNames = _playerNames;
@synthesize gameType = _gameType;
@synthesize numberOfMinutes = _numberOfMinutes;
@synthesize numberOfTurns = _numberOfTurns;
@synthesize boardSize = _boardSize;

@end

This class basically just holds data. I then try to use this object in my viewcontroller:

MainMenu.h

#import <UIKit/UIKit.h>
@class GameSetUpData;

@interface MainMenu : UIViewController

@property (strong, nonatomic) GameSetUpData *gameSetUp;

-(IBAction)tappedNewGame:(id)sender;
-(IBAction)tappedTwoPlayers:(id)sender;
...

MainMenu.m

#import "MainMenu.h"
#import "MJViewController.h"
#import "GameSetUpData.h"

@implementation MainMenu
@synthesize gameSetUp = _gameSetUp;

...

-(IBAction)tappedTwoPlayers:(id)sender {
    _gameSetUp.numberOfPlayers = 2;
    NSLog(@"number of Players: %d", _gameSetUp.numberOfPlayers);
}

Unfortunately, my NSLog says that numberOfPlayers is equal to 0. What is wrong with my GameSetUpData? I was told that in iOS5 we do not need to call alloc/init or make a dealloc method. Do I still need a -(void)init method in GameSetUpData. Thank you all for your time!

Edit: Please alloc/init your objects — ARC ONLY deals with release/retain/autorelease. You still need to make an instance of an Object! I apologize for the mis-information. I will make sure to RTFM next time…

Answer 1

Of course you have to alloc/init your object. How should the compiler know when to do that? With ARC you just don’t need to retain or release.

Add _gameSetUp = [[GameSetUpData alloc] init]; somewhere.