Xcode 8 beta 4:Calendar.Unit 与 Calendar.Component [英] Xcode 8 beta 4: Calendar.Unit vs Calendar.Component

问题描述

此 Swift 3 代码一直工作到 XCode 8 beta 3:

This Swift 3 code worked until XCode 8 beta 3:

let calendar = Calendar.current
let anchorComponents = calendar.components([Calendar.Unit.day, Calendar.Unit.month, Calendar.Unit.year, Calendar.Unit.hour], from: self)

在 Xcode 8 beta 4 中 Calendar.Unit 似乎被重命名为 Calendar.Component.

In Xcode 8 beta 4 Calendar.Unit appears to be renamed to Calendar.Component.

现在这个代码

let calendar = Calendar.current
let anchorComponents = calendar.components([Calendar.Component.day, Calendar.Component.month, Calendar.Component.year, Calendar.Component.hour], from: self)

产生编译器错误cannot convert type Calendar.Component to NSCalendar.Unit

我做错了什么还是这是一个错误?

Am I doing anything wrong or is this a bug?

推荐答案

在 Xcode 8 beta 4 随附的 Swift 版本中，components 已重命名为 dateComponents.

In the Swift version shipped with Xcode 8 beta 4, components has been renamed to dateComponents.

注意:为了使调用更简单，您可以省略 Calendar.Component 前缀.

Note: to make the call simpler, you can omit the Calendar.Component prefix.

let anchorComponents = calendar.dateComponents([.day, .month, .year, .hour], from: self)

你得到的错误信息有点误导，我猜编译器在类型推断上挣扎.

The error message you got is a bit misleading, I guess the compiler was struggling with type inference.

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