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?

推荐答案

如果您将演员表添加为 as CFArray 就可以工作:

It works if you add the cast as CFArray:

let colors = [fromColor.cgColor, toColor.cgColor] as CFArray

或者您可以在通话中添加演员:

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 已被删除.在某些情况下，例如这种情况，您需要添加显式转换以使其工作.

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.

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