how to create singleton object

Singleton object are created only once in the life cycle of the app.

Singleton object can be accessed using [ClassName sharedInstance].

+(id)sharedInstance{
    static MyClassManager *sharedMyClassManager = nil;
    static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
          sharedMyClassManager = [[self alloc] init];
     });
     retrun sharedMyClassManager;
}

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