Question

I am novice in ios and I try to write a simple singleton object to share data between controllers. Here is my code:

#import <Foundation/Foundation.h>
#import "SynthesizeSingleton.h";

@interface BSStore : NSObject

+(BSStore *)sharedStore;

@property (nonatomic,strong) NSArray *sharedNotebooks;

@end



#import "BSStore.h"

@implementation BSStore

SYNTHESIZE_SINGLETON_FOR_CLASS(BSStore)

@synthesize sharedNotebooks;

@end

//Write Objects in AppDelegate

[BSStore sharedStore].sharedNotebooks = notebooks;

//Read objects in a ViewController

  Notebook *notebook = [[BSStore sharedStore].sharedNotebooks objectAtIndex:indexPath.row];

and I get:

2012-10-04 02:01:29.053 BarneyShop[1827:f803] +[BSStore sharedStore]: unrecognized selector sent to class 0x69b8
2012-10-04 02:01:29.073 BarneyShop[1827:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[BSStore sharedStore]: unrecognized selector sent to class 0x69b8'
*** First throw call stack:

Answer 1

This is what your Singleton class should look like:

#import "BSStore.h"

@implementation BSStore

@synthesize sharedNotebooks;

+ (BSStore *) sharedStore
{
    static BSStore * singleton;

    if ( ! singleton)
    {
        singleton = [[BSStore alloc] init];

    }
    return singleton;
}

@end

Now you can call:

[BSStore sharedStore].sharedNotebooks;