Xcode 8 和 Swift 3

Question

我在Swift实现了我的手表项目，现在由于Xcode8，我正在迁移到Swift3。我让Xcode8将源代码更改为Swift 3. 但是代码有错误，我想不通

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，我无法理解这个问题。

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

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

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

Answer 1

将 unitFlags 的类型更改为 Set

Answer 2

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

在 Swift 3 中，您的代码等效于

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

Xcode 8 和 Swift 3

Xcode 8 and Swift 3 NSCalendar

ios

swift

swift2

swift3