在Swift中将CGFloat转换为NSNumber [英] Convert CGFloat to NSNumber in Swift
本文介绍了在Swift中将CGFloat转换为NSNumber的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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?
推荐答案
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))
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