Wait for an async methods to finish in a for loop

Question

I have a for loop containing three asynchronous methods, and I want to make some treatment after this 3 async methods are finished.

 -(void)getAllUsersInformatio         


        

Answer 1

Try to do a block with completion, you can't do this with a for loop if the methods are async. you have to call getUserInfo one by one after the completion of the previous. I think this gonna be solved your problem.

  -(void)getAllUsersInformations{
    [self registerUserAtIndex:0];
  }

  - (void) registerUserAtIndex: (NSInteger ) userIndex
  {
  RegisterOperation *op = [[RegisterOperation alloc] initWithUser:[users objectAtIndex:userIndex]];
  [RegisterOperation setResultCompletionBlock:^(BOOL *finished, NSInteger userIndex) {
      dispatch_async(dispatch_get_main_queue(), ^{
      if (userIndex++ < [users count] {
         [self registerUserAtIndex:userIndex++];
      } else {
         [myTableView reloadData];
      }
   }];
  [[NSOperationQueue mainQueue] addOperation:op];
 }

Hope this will help you.