不能在没有“as CVarArg"的情况下将日期传递给 NSPredicate(format: ...)； [英] Can't pass Date to NSPredicate(format: ...) without "as CVarArg"

问题描述

这是我应该如何将 Date 传递给 NSPredicate.init(format predicateFormat: String, arguments argList: CVaListPointer).

Is this how I'm supposed to pass a Date to NSPredicate.init(format predicateFormat: String, arguments argList: CVaListPointer).

let endDate = Date()
NSPredicate(format: "endDate == %@", endDate as CVarArg)

看起来有点笨拙，我怀疑我做错了什么.

It looks kinda clumsy, and I suspect I'm doing something wrong.

推荐答案

%@ 格式期望 Foundation 对象 作为参数，比较《谓词编程指南》中的谓词格式字符串语法"".

The %@ format expect a Foundation object as argument, compare "Predicate Format String Syntax" in the "Predicate Programming Guide".

因此您必须将覆盖类型 Date 转换回其 Foundation对应NSDate:

Therefore you have to cast the overlay type Date back to its Foundation counterpart NSDate:

let endDate = Date()
let pred = NSPredicate(format: "endDate == %@", endDate as NSDate)

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