Swift 2 中对 registerUserNotificationSettings 的更改？

Question

除了去年 11 月生成的文档 (here)，我似乎找不到任何关于 registerUserNotificationSettings 的文档，但我的旧代码在 Xcode 中似乎不再适用7 和 Swift 2.

我在 App Delegate 中有这段代码：

let endGameAction = UIMutableUserNotificationAction()
endGameAction.identifier = "END_GAME"
endGameAction.title = "End Game"
endGameAction.activationMode = .Background
endGameAction.authenticationRequired = false
endGameAction.destructive = true

let continueGameAction = UIMutableUserNotificationAction()
continueGameAction.identifier = "CONTINUE_GAME"
continueGameAction.title = "Continue"
continueGameAction.activationMode = .Foreground
continueGameAction.authenticationRequired = false
continueGameAction.destructive = false

let restartGameCategory = UIMutableUserNotificationCategory()
restartGameCategory.identifier = "RESTART_CATEGORY"
restartGameCategory.setActions([continueGameAction, endGameAction], forContext: .Default)
restartGameCategory.setActions([endGameAction, continueGameAction], forContext: .Minimal)

application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: (NSSet(array: [restartGameCategory])) as Set<NSObject>))

我现在在代码的最后一行收到以下两个错误：

'Element.Protocol' does not have a member named 'Alert'

和

Cannot invoke 'registerUserNotificationSettings' with an argument list of type '(UIUserNotificationSettings)'

我搜索了有关任何更改的信息，但找不到任何信息。我是否遗漏了一些明显的东西？

Answer 1

而不是像这样将 (NSSet(array: [restartGameCategory])) as Set<NSObject>) 与 (NSSet(array: [restartGameCategory])) as? Set<UIUserNotificationCategory>) 一起使用：

application.registerUserNotificationSettings(
    UIUserNotificationSettings(
        forTypes: [.Alert, .Badge, .Sound],
        categories: (NSSet(array: [restartGameCategory])) as? Set<UIUserNotificationCategory>))

Answer 2

@Banning 的回答会奏效，但可以用更快捷的方式来做到这一点。您可以使用具有通用类型 UIUserNotificationCategory.

的 Set 从头开始构建它，而不是使用 NSSet 和向下转换

let categories = Set<UIUserNotificationCategory>(arrayLiteral: restartGameCategory)
let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: categories)
application.registerUserNotificationSettings(settings)

同样值得注意的是，将代码分成多行将有助于您准确确定问题所在。在这种情况下，您的第二个错误只是第一个错误的结果，因为表达式是内联的。

正如@stephencelis 在他下面的评论中专家指出的那样，集合是 ArrayLiteralConvertible，因此您可以将其一直减少到以下。

let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: [restartGameCategory])

Swift 2 中对 registerUserNotificationSettings 的更改？

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