How to cast from UInt16 to NSNumber

Question

I have a UInt16 variable that I would like to pass to a legacy function that requires an NSNumber.

If I try:

var castAsNSNumber : NSNumber = myUInt16

I get a compiler error 'UInt16' is not convertible to 'NSNumber'

Question

How can I recast this as an NSNumber?

How about `var castAsNSNumber : NSNumber = NSNumber(myUInt16)` ? — Adam, Jun 10 '14 at 06:58
Thanks Adam, although your suggestion didn't work, it triggered a compiler hint that produced the answer that John has posted. — PassKit, Jun 10 '14 at 07:07
That is not casting, it is creating an `NSNumber` from a integer. — zaph, Dec 04 '15 at 16:26

score 38 · Accepted Answer · answered Jun 10 '14 at 07:06

38

var castAsNSNumber = NSNumber(unsignedShort: myUInt16)

answered Jun 10 '14 at 07:06

John Estropia

12

Swift 3: var castAsNSNumber = NSNumber(value: myUInt16) – Raymond Aug 10 '16 at 16:33

Mecki · Answer 2 · 2021-11-10T16:28:33.220

2

Swift 4 or newer (still works in 5.5.1):

import Foundation

let u16 = UInt16(24)
let nsnum = u16 as NSNumber
let andBack = UInt16(truncating: nsnum)

print("\(u16), \(nsnum), \(andBack)")

Or instead of

let andBack = UInt16(truncating: nsnum)

you can also use

let andBack = nsnum.uint16Value

edited Nov 10 '21 at 16:28

answered Nov 10 '21 at 15:50

Mecki