Singleton class not working with tab bar iphone application

I have a tab-bar application, im using sing开发者_如何转开发leton class to share some data through out my application. In my application delegate class in didFinishLaunchingWithOptions method I am getting my data from server and storing it in singleton class, and I can see that its been stored correctly in my singleton class using NSLog.

But now when, I am trying to access that data in my second tab-bar click its giving me “EXC_BAD_ACCESS”. my viewDidLoad code

 - (void)viewDidLoad {

SingleTon *get = [SingleTon sharedInstanceHname];
result = [get getHname:result];
list = [[NSArray alloc] initWithArray:result];
 NSLog(@"List%@", list);


[super viewDidLoad];
}

I can see that error (“EXC_BAD_ACCESS”) is at line

 list = [[NSArray alloc] initWithArray:result];

I want to use this data to populate in second tab bar view...any suggestions how to resolve this error????

sharedInstance method

 static SingleTon  *_sharedInstanceHname;

 - (id) init
 {
if (self = [super init])
{
    // custom initialization
    //memset(board, 0, sizeof(board));
    hname = [[NSMutableArray alloc] init];
    index =1;
}
return self;

}

     + (SingleTon *) sharedInstanceHname   
      {
       if (!_sharedInstanceHname)
   {
    _sharedInstanceHname = [[SingleTon alloc] init];
    }

    return _sharedInstanceHname;
        } 



    - (NSMutableArray *) getHname:(NSMutableArray *)x
    {
return hname;
    }

What is the message getHname returning?

I suspect the 'result' is not a member of NSArray.

Another thought is perhaps 'result' is nil. I don't think the method initWithArray: like been given a nil value.

Do sharedInstanceHname or gHname return autoreleased objects? You may need to retain them for your use like so:

- (void) viewDidLoad
{
   SingleTon *get = [SingleTon sharedInstanceHname];
   [get retain];
   result = [get gHname:result];
   [result retain];
   [get release];
   list = [[NSArray alloc] initWithArray:result];
   [result release];

   [super viewDidLoad];
}

I wouldn't use the above code though; it serves only the purpose of demonstrating to you the concept of autorelease and retain/release ownership. Figure out what sharedInstanceHname or gHname return, and program accordingly.

EDIT: More importantly, does the sharedInstanceHname method in the SingleTon class retain ownership of the object returned by that method? If it does return an autoreleased object, it isn't strictly a Singleton object and rather a constructor of sorts.