NSPredicate 比较 Int32 [英] NSPredicate to compare Int32

问题描述

elementFetch.predicate = NSPredicate(format: "pageId = %@",(Int32(pagesFromDb.first?.pageId)) !)
var Data = try moc.fetch(elementFetch as! NSFetchRequest<NSFetchRequestResult>) as! [Element]

我用 %I、%d 尝试过，然后转换为 Int 或数字，没有任何效果.请建议如何执行此操作.

I tried it with %I, %d, and converting to Int or number, nothing works. Please suggest how to do this.

推荐答案

这是因为您使用的是用于字符串的运算符 %@.对于整数，使用 %i(不是 %I)，如下所示:

This is because you are using the operator %@ which is for Strings. For integers use %i (not %I) as follows:

elementFetch.predicate = NSPredicate(format: "pageId = %i", pagesFromDb.first?.pageId)

这篇关于NSPredicate 比较 Int32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！