无法将types'CFString'的值转换为期望的参数types'UnsafePointer <Void>'（又名'UnsafePointer <（）>'）

当我定义行时，出现构build错误

let runFont : CTFontRef = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName) 

错误是：无法将types'CFString'的值转换为期望的参数types'UnsafePointer'（又名'UnsafePointer <（）>'）

Answer 1

尝试

 let runFont = unsafeBitCast(CFDictionaryGetValue(CTRunGetAttributes(run), unsafeBitCast(kCTFontAttributeName, UnsafePointer<Void>.self)), CTFontRef.self) 

Answer 2

@vadian Swift 3版本的答案：

 let runFont = unsafeBitCast(CFDictionaryGetValue(CTRunGetAttributes(run), unsafeBitCast(kCTFontAttributeName, to: UnsafeRawPointer.self)), to: CTFont.self)