objective c - IOS function handler threadsafe -


The code below is called the scrollview scroll each time and if the user scrolls it several times, the code crashes done. How can I ensure that only one code executes a time or thread? 

  [self.cv addInfiniteScrollingWithActionHandler: ^ {[weakSelf loadNextPage]; }];    
 
 
 Here is an example  
  - (zero) _start presentation {FooClass * foo = [[Foo Class Alok] init]; Dispatch_queue_t queue = dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); For (int i = 0; i

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