在Xcode 8(Swift 3)中将Swift数组转换为CFArray
问题描述：
这不再适用于Xcode 8 beta 6:
This no longer works in Xcode 8 beta 6:
let colors:CFArray = [fromColor.cgColor, toColor.cgColor]
或
let gradient:CGGradient = CGGradient(colorsSpace: CGColorSpaceCreateDeviceRGB(), colors:[fromColor.cgColor, toColor.cgColor], locations:[0.0, 1.0])!
错误是:上下文类型'CFArray'不能与数组文字一起使用
The error is: Contextual type 'CFArray' cannot be used with array literal
从数组转换为CFArray的最新方法是什么?
What's the latest way to convert from array to CFArray?
答
如果添加强制转换as CFArray:
let colors = [fromColor.cgColor, toColor.cgColor] as CFArray
或者您可以在通话中添加演员表
or you can add the cast in a call:
let gradient = CGGradient(colorsSpace: CGColorSpaceCreateDeviceRGB(), colors:[fromColor.cgColor, toColor.cgColor] as CFArray, locations:[0.0, 1.0])!
在Swift 3(Xcode 8 beta 6)中，隐式转换为桥接类型
In Swift 3 (Xcode 8 beta 6), implicit casting to bridged types has been removed. In some cases, like this one, you will need to add explicit casting to make it work.