[Objective-C] Correct way for to scroll after of reloadData completion

// correct way for to scroll, or execute a block of code, only after of reloadData completion
[self.collectionView reloadData];
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
	// scroll to item
	NSIndexPath *indexPath = [NSIndexPath indexPathForItem:3 inSection:0];
	[self.collectionView selectItemAtIndexPath:indexPath animated:YES scrollPosition:UICollectionViewScrollPositionLeft];

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