How can I convert Int32 to Int in Swift?

Question

It should be easy but I can only find the reverse conversion. How can I convert Int32 to Int in Swift? Unless the problem is different?

I have a value stored in Core Data and I want to return it as an Int.

Here is the code I am using, which does not work:

func myNumber () -> Int {
    var myUnit:NSManagedObject
    myUnit=self.getObject(“EntityName”) // This is working.

    return Int(myUnit.valueForKey(“theNUMBER”)?.intValue!)
 }

`let i32 = UInt32(911)` and then `let i = Int(i32)` hope this helps — Matteo Piombo, Jun 05 '15 at 07:18
intValue returns Int32 you can use integerValue to return Int — Leo Dabus, Jun 05 '15 at 07:38
return myUnit.valueForKey(“theNUMBER”)?.integerValue ?? 0 — Leo Dabus, Jun 05 '15 at 07:39
Replacing intValue by integerValue doesn't change much. It still doesn't work. — Michel, Jun 05 '15 at 07:46
@Matteo Piombo: I hav tried your solution, but without success. — Michel, Jun 05 '15 at 07:50
You should consider changing your title because atm it is not you real problem. — Arbitur, Jun 05 '15 at 07:54
Now I see your added sample code. @Arbitur answers seems more appropriate now — Matteo Piombo, Jun 05 '15 at 07:59

score 44 · Answer 1 · answered Jun 05 '15 at 07:18

44

Am I missing something or isn't this ridiculously easy?

let number1: Int32 = 10
let number2 = Int(number1)

answered Jun 05 '15 at 07:18

Eendje

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That's very strange. It just works in my playground. What error are you getting? – Eendje Jun 05 '15 at 07:37
If the conversion is as you write, then the problem must be different. I edited the question, in order to make things clearer. I want the function to work, I thought the problem was about conversion, but maybe it isn't. I am only making my first steps in Swift. – Michel Jun 05 '15 at 07:39
Before looking at your edit, core data returns numbers as `NSNumber` if I'm correct. Usually the typical conversion `Int()` should be enough. – Eendje Jun 05 '15 at 07:42
March23 2016; Swift 2.x works! best answer by a mile or more – user3069232 Mar 23 '16 at 08:38
`Cannot invoke initializer for type 'Int' with an argument list of type '(() -> Int32)` this is the error that im getting in swift 4 – Sarath Aug 01 '18 at 11:25
1

@Sarath No problems here, using Swift 4.1. `print(type(of: number2))` prints `Int` just fine. – Eendje Aug 01 '18 at 14:13
@Eendje Thanks for your answer and I converted it into string and back to Int. like this `Int("\(Int32value)")` its worked for me. – Sarath Aug 03 '18 at 06:58

Arbitur · Accepted Answer · 2015-06-05T07:53:37.747

The error is your ? after valueForKey.

Int initializer doesnt accept optionals.

By doing myUnit.valueForKey(“theNUMBER”)?.intValue! gives you an optional value and the ! at the end doesnt help it.

Just replace with this:

return Int(myUnit.valueForKey(“theNUMBER”)!.intValue)

But you could also do like this if you want it to be fail safe:

return myUnit.valueForKey(“theNUMBER”)?.integerValue ?? 0

And to shorten you function you can do this:

func myNumber() -> Int {
    let myUnit = self.getObject("EntityName") as! NSManagedObject

    return myUnit.valueForKey("theNUMBER")?.integerValue ?? 0
}

score 8 · Answer 3 · answered Feb 24 '19 at 10:47

Swift 4.0 producing "Cannot invoke initializer for type 'Int' with an argument list of type '(() -> Int32)"

let number1: Int32 = 10
let number2 = Int(number1)

Simply do this

Int("\(Int32value)")

I'm unable to understand why swift is making things difficult.

score 2 · Answer 4 · answered May 28 '19 at 12:42

2

Sometimes "?" make things twisted , adding "!" to Int32 and then convert it to int works

let number1 = someInt32!
let number2 = Int(number1)

answered May 28 '19 at 12:42

LeoNard

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How can I convert Int32 to Int in Swift?

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