NSMutableArray in Singleton object

Question

I want to build a shared object that all the classes will be able to access to it. i want that in this object will be NSMutableArray .

this is how i call this object

+(id)sharedManager{
@synchronized(self) {
    if (sharedManager == nil){
        sharedManager = [[self alloc] init];
        array = [[NSMutableArray alloc] init];
    }
}
return sharedManager;

}

and this is how i define the NSMutableArray :

@property (nonatomic,retain) NSMutableArray *array;

the problem is that after i create this NSMutableArray in the sharedManager method, every time i try to access the array is equal to Nil.

With GCD, there's no need for a @synchronized block to protect an action that should only occur once. Replace that with a call to dispatch_once() instead. It's cleaner and faster. — Lily Ballard
– Lily Ballard, Commented Dec 1, 2011 at 23:36
See 'What does your Objective-C singleton look like?' stackoverflow.com/questions/145154/… — Jacob Jennings
– Jacob Jennings, Commented Dec 1, 2011 at 23:45
Where is array declared? They way you're doing it it has to be declared static, and would not be accessible from a property. You can make the property readonly and write your own getArray method rather than using @synthesize, however, to make it accessible from the property. — Hot Licks
– Hot Licks, Commented Dec 1, 2011 at 23:47

Mark Adams · Accepted Answer · 2011-12-01 23:34:00Z

3

You're attempting to set an instance variable from a class method. Instead, you should create array in your -init method in the singleton. That way when you message, sharedManager = [[self alloc] init];, the array will be configured for that shared instance.

- (id)init
{
    self = [super init];

    if (!self)
        return nil;

    array = [[NSMutableArray alloc] init];

    return self;
}

answered Dec 1, 2011 at 23:34

Mark Adams

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