Convert CGFloat to NSNumber in Swift

Question

I have an extension in Swift that holds some properties which are CGFloat's. The problem is that I don't know how to get the store the CGFloat value as a NSNumber using the associated objects

Here is the code I have that doesn't work but it details what I want to do:

var scaledFontSize: CGFloat {
    get {
        guard let fontSize = objc_getAssociatedObject(self, &AssociatedKeys.scaledFontSize) as? NSNumber else {
            //Set it
            let scaledFont:CGFloat = VGSizeValues.getValueFromValue(self.font.pointSize);
                //Fails here
            objc_setAssociatedObject(self,&AssociatedKeys.scaledFontSize, NSNumber( scaledFont),objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
            return scaledFont;
        }
        return CGFloat(fontSize.doubleValue);

    }
}

Does anyone way to work around this?

let floatInNumber = NSNumber(float: Float(floatValue)) – Adarsh G J Dec 15 '15 at 00:44 — Adarsh G J, Dec 15 '15 at 00:44

score 72 · Accepted Answer · edited Oct 10 '16 at 18:42

72

In Swift 3.0

let myFloat : CGFloat = 1234.5

let myNumber = NSNumber(value: Float(myFloat))

or

let myNumber = NSNumber(value: Double(myFloat))

In Swift 2

let myNumber = NSNumber(double: myFloat.native)

or

let myNumber = NSNumber(double: Double(myFloat))

or

let myNumber = NSNumber(float: Float(myFloat))

edited Oct 10 '16 at 18:42

Himanshu A Jadav

2,286
22
34

answered Dec 15 '15 at 00:19

ttarik

3,824
1
32
51

1

the problem with let myNumber = NSNumber(value: Float(myFloat)) is that I lose precision CGFloat 0.4 => Float 0.400000006 – CiNN Oct 13 '16 at 10:25

score 11 · Answer 2 · answered Nov 07 '16 at 19:09

11

For Swift 3.1

var final_price: CGFloat = 12.34
let num = final_price as NSNumber

answered Nov 07 '16 at 19:09

Tot FOURLEAF

129
1
2

This should be the correct answer – Honghao Z Oct 21 '21 at 06:35

score 7 · Answer 3 · answered Aug 10 '16 at 16:38

7

Swift 3

let myNumber = NSNumber(value: Float(myCGFloat))

answered Aug 10 '16 at 16:38

Raymond

1,172
16
20

score 2 · Answer 4 · answered Sep 09 '19 at 13:23

2

You can access a CGFloat's NativeType via the native property:

public var native: CGFloat.NativeType

The native type used to store the CGFloat, which is Float on 32-bit architectures and Double on 64-bit architectures.

With this you can create an NSNumber like so:

NSNumber(value: cgFloat.native)

answered Sep 09 '19 at 13:23

Mark Leonard

2,056
19
28

This should be the correct answer! By using `Float(cgFloat)` you may be loosing precision if the native type is a `Double`. `NSNumber(value: cgFloat.native)` is the way to go – OscarVGG Jun 19 '20 at 07:53

score 1 · Answer 5 · answered Sep 16 '16 at 10:00

1

For me this is worked.

self.configuration.cellHeight as NSNumber!

answered Sep 16 '16 at 10:00

Narasimha Nallamsetty

1,215
14
16

Convert CGFloat to NSNumber in Swift

5 Answers5

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