Singleton

Singleton

#import <Foundation/Foundation.h>
#import<AddressBook/AddressBook.h>

@interface Singleton : NSObject
{
    //int myInt;
}
@property (nonatomic) ABRecordRef personGlobal; //Global Addressbook Person Object.
@property (nonatomic) int myInt;

+ (id)sharedInstance;


@end



//.m

#import "Singleton.h"

@implementation Singleton

static Singleton *sharedInstance = nil;

// Get the shared instance and create it if necessary.
+ (Singleton *)sharedInstance {
    if (nil != sharedInstance) {
        return sharedInstance;
    }
    
    static dispatch_once_t pred;        // Lock
    dispatch_once(&pred, ^{             // This code is called at most once per app
        sharedInstance = [[Singleton alloc] init];
    });
    
    return sharedInstance;
}

// We can still have a regular init method, that will get called the first time the Singleton is used.
- (id)init
{
    self = [super init];
    
    if (self) {
        // Work your initialising magic here as you normally would
        
    }
    
    return self;
}

@end