My caches images to a directory (/Library/Caches/ImageCache/). When the directory exceeds a certain size I would like to delete the oldest file in the directory. To accomplish this task I use NSFileManager to retrieve the directory contents. I then try to sort this array by date and delete the oldest object. My caches images to a directory (/Library/Cache
阅读背景：
根据创建日期对NSURL对象数组进行排序
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