CODEWITHSUNDEEP
iosswift
ppalancica
ppalancica

Reputation: 4277

How to convert Int to int in swift?

I have a variable called number of type Int

var number = value!.integerValue as Int

Now I have to create a NSNumber object using that value.

I am trying to use this constructor

value = NSNumber(int: number)

, but it does not work.

It expect the primitive type int, not Int I guess.

Anyone know how to get around this?

Thanks!

Upvotes: 7

Views: 19424

Answers (3)

Dima
Dima

Reputation: 23624

You just do value = number

As you can see in the documentation:

https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/WorkingWithCocoaDataTypes.html

the native swift number types generally bridge directly to NSNumber.

Numbers

Swift automatically bridges certain native number types, such as Int and Float, to NSNumber. This bridging lets you create an NSNumber from one of these types:

SWIFT

let n = 42
let m: NSNumber = n
It also allows you to pass a value of type Int, for example, to an argument expecting an NSNumber. Note that because NSNumber can contain a variety of different types, you cannot pass it to something expecting an Int value.

All of the following types are automatically bridged to NSNumber:

Int
UInt
Float
Double
Bool

Swift 3 update

In Swift 3, this bridging conversion is no longer automatic and you have to cast it explicitly like this:

let n = 42
let m: NSNumber = n as NSNumber

Upvotes: 7

Boris
Boris

Reputation: 11693

For Swift 3 you must use:

var convertedNumber = NSNumber(value: numberToConvert)

Upvotes: 4

Logan
Logan

Reputation: 53112

The issue is because in ObjC, an int is a 32 bit number, and an integer or NSInteger is a 64 bit number.

var number = value!.integerValue as Int

Number is of type Int which corresponds to the ObjC type NSInteger

You now try to create with this:

value = NSNumber(int: number)

Which takes an Int32 or int type, thus resulting in failure. You have a few options that will work.

One:

value = NSNumber(int: Int32(number))

Two (probably better):

value = NSNumber(integer: number)

Three (probably best):

As @Dima points out, you can just set it directly because swift automatically converts:

value = number

Upvotes: 4

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