Listing random item from a NSArray

I listed random items that are going to be in the store, but this logic doesn't seem like a fast one.. Maybe I'll post some code when I have time... Click on the item, and the item gets added to the itemsArray in Player class.
BuyViewControllerでアイテムをランダムで表示。ランダムロジックがよくない。クリックするとアイテムバッグへそのアイテムを登録。