Xcode 8和Swift 3 NSCalendar [英] Xcode 8 and Swift 3 NSCalendar

问题描述

我在Swift中实现了我的watch项目，由于Xcode 8，我现在迁移到Swift3.我让Xcode 8将源代码更改为Swift3.但是，代码中有错误，我无法弄清楚

I implemented my watch project in Swift and now I am migrating to Swift 3 because of Xcode 8. I let Xcode 8 change the source code to Swift 3. However, there are errors in the code and I can not figure it out.

let unitFlags: Calendar = [.hour, .firstWeekday, .monthSymbols, .year, .minute, .firstWeekday]

var calendar = NSCalendar.current
calendar.timeZone = NSTimeZone(identifier: "UTC")!
let components = (calendar as NSCalendar).components(unitFlags, from: reservationDate)

Xcode在这些行中给出了错误，我无法理解问题.

Xcode gives error in these lines and I can not understand the problem.

错误:上下文类型日历"不能与数组文字一起使用

ERROR: Contextual type ' Calendar' cannot be used with array literal

错误:参数标签'(identifier :)'与任何可用标签都不匹配 超载

ERROR: Argument labels '(identifier:)' do not match any available overloads

错误:无法将日历"类型的值转换为预期参数 键入"NSCalendar.Unit"

ERROR: Cannot convert value of type 'Calendar' to expected argument type 'NSCalendar.Unit'

推荐答案

首先，Swift 2中的NSCalendarUnit和Swift 3中的Calendar.Component都不包含组件firstWeekday和monthSymbols.

First of all, neither NSCalendarUnit in Swift 2 nor Calendar.Component in Swift 3 contain the components firstWeekday and monthSymbols.

在Swift 3中，您的代码等同于

In Swift 3 the equivalent of your code is

let unitFlags = Set<Calendar.Component>([.hour, .year, .minute])
var calendar = Calendar.current
calendar.timeZone = TimeZone(identifier: "UTC")!
let components = calendar.dateComponents(unitFlags, from: reservationDate)

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