确定NSFetchedResultsController是否为空 [英] Determine if NSFetchedResultsController is Empty
本文介绍了确定NSFetchedResultsController是否为空的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
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
}
这篇关于确定NSFetchedResultsController是否为空的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
