Singleton Code for ObjectiveC iOS7

ObjectiveC Singleton

SingletonClass.h:
@interface SingletonClass : NSObject
@property (nonatomic, retain) NSString *myProperty;
+ (SingletonClass *)sharedInstance;
@end


SingletonClass.m:
@implentation
+ (SingletonClass *)sharedInstance
{
    // 1
    static SingletonClass *_sharedInstance = nil;
 
    // 2
    static dispatch_once_t oncePredicate;
 
    // 3
    dispatch_once(&oncePredicate, ^{
        _sharedInstance = [[SingletonClass alloc] init];
    });
    return _sharedInstance;
}

// There’s a lot going on in this short method:
// Declare a static variable to hold the instance of your class, ensuring it’s available globally inside your class.
// Declare the static variable dispatch_once_t which ensures that the initialization code executes only once.
// Use Grand Central Dispatch (GCD) to execute a block which initializes an instance of LibraryAPI. 
// This is the essence of the Singleton design pattern: the initializer is never called again once the class has been instantiated.

- (id)init {
  if (self = [super init]) {
      myProperty = [[NSString alloc] initWithString:@"Default Value "];
  }
  return self;
}

@end

Very helpful ! Thank you !

Plain and simple, thanks a lot 👍