在Swift中将CGFloat转换为NSNumber

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?

Answer 1

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))

Answer 2

For Swift 3.1

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

Answer 3

斯威夫特3

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

Answer 4

对我来说，这是有效的。

self.configuration.cellHeight as NSNumber!

Answer 5

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)