How to use NSPredicate with Date type

Question

I am trying to make NSPredicate based on a date... I have tried this:

let datePredicate = NSPredicate(format: "due_date < %@", Date())

I am not sure, but iirc, this worked before?

Now I get this error:

Argument type 'Date' does not conform to expected type 'CVarArg'

I tried smth like this

... Date() as NSDate, but that failed too.

How to solve this?

CrispyCrack · Answer 1 · 2020-02-15T14:30:52.640

0

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

let dueDate = Date()
let pred1 = NSPredicate(format: "due_date < %@", dueDate as NSDate)

edited Feb 15 '20 at 14:30

answered Feb 15 '20 at 14:28

CrispyCrack

I tried that (you can see I mentioned it already in my question). I get 'Date?' is not convertible to 'NSDate' – Whirlwind Feb 15 '20 at 14:30
It should be work then I just tried it on Playground – CrispyCrack Feb 15 '20 at 14:34
Yeah in playground it works, but it gives me error in Xcode :/ It just doesn't compile. – Whirlwind Feb 15 '20 at 14:42

vadian · Accepted Answer · 2020-02-15T19:40:26.283

0

To use the current date as a predicate parameter just create an NSDate instance

let datePredicate = NSPredicate(format: "due_date < %@", NSDate())

For a date variable you can use

aDate as NSDate

or

aDate as CVarArg

If you get the error

'Date?' is not convertible to 'NSDate'

then the code is not the real code because both Date() and NSDate() are non-optional.

edited Feb 15 '20 at 19:40

answered Feb 15 '20 at 19:34

vadian

2 Answers2