在Swift中将CGFloat转换为NSNumber

问题描述：

我在Swift中有一个扩展，它包含一些属性 CGFloat 的。问题是，我不知道如何使用相关对象将 CGFloat 值存储为 NSNumber

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

这里的代码我没有工作，但它详细说明了我想做什么：

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);

    }
}

有没有办法解决这个问题？

Does anyone way to work around this?

答

在Swift 3.0中

In Swift 3.0

let myFloat : CGFloat = 1234.5

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

或

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

在Swift 2中

let myNumber = NSNumber(double: myFloat.native)

或

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

或

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

在Swift中将CGFloat转换为NSNumber

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