Can't pass Date to NSPredicate(format: ...) without "as CVarArg"

swift swift3 nsdate nspredicate foundation
netigger picture netigger · Sep 20, 2016 · Viewed 7.7k times · Source

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)

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

Answer

Martin R picture Martin R · Sep 20, 2016

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

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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