快速轉換UIFont到CGFont？

Question

需要通過CGFont爲以下功能

CGFontCreateCopyWithVariations(<#font: CGFont!#>, <#variations: CFDictionary!#>)) 

Answer 1

這裏是一個小例子：

var font = UIFont.systemFontOfSize(15.0) 
var fontName = font.fontName as NSString 
var cgFont = CGFontCreateWithFontName(fontName); 

var copiedFont = CGFontCreateCopyWithVariations(cgFont, nil) 

Answer 2

就遇上了這樣斯威夫特4和接受的答案不再是相當有效的。下面拿了UIFont，給了我一個可用的CGFont：

if let uiFont = UIFont(name: "Helvetica-Bold", size: 36.0), 
    let cgFont = CGFont(uiFont.fontName as CFString) { 
     // Do stuff   
    }