Example. I've got an array with 15 objects. I want to start enumerating from a given index. Say start at index 5 and then the index above, the index under, above, under etc... I don't want it to wrap around, but rather stop and continue in unexplored direction.Example. I've got an array with 15 objects. I w
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枚举NSArray从givven索引开始搜索两种方式（没有环绕）
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