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我試圖找到哪些NSIndexPaths同時可見和選擇。這兩個數組被初始化這樣的:找到2個NSIndexPath數組的交集
let visibleSelectedItems = collectionView.indexPathsForVisibleItems()
let selectedItems = collectionView.indexPathsForSelectedItems()
我基本上找2個數組的交集。索引路徑被聲明爲NSIndexPath(forItem: Int, inSection: Int)