确定NSFetchedResultsController是否为空

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确定NSFetchedResultsController是否为空（不包含任何条目）的好方法是什么？我意识到有人可以使用 fetchedObjects 是否会将所有结果加载到内存中？

What is a good way of determining if a NSFetchedResultsController is empty (contains no entries)? I realize that one could use fetchedObjects does this load all results into memory?

推荐答案

fetchedObjects是一个数组，是检查0条记录的好方法。

fetchedObjects is an array, and is a good a way as any to check for 0 records.

您还可以使用

id <NSFetchedResultsSectionInfo> sectionInfo = [[_fetchedResultsController sections] objectAtIndex:section]; if([sectionInfo numberOfObjects] == 0) { // do something }