Question

我似乎找不到有关registerUserNotificationSettings的任何文档，超出去年11月制作的文档（here），但我的旧代码似乎在Xcode 7和Swift 2中不再适用于我。< / p>

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>))

我现在在最后一行代码中收到以下两个错误：

'Element.Protocol'没有名为'Alert'的成员

和

无法使用类型为'（UIUserNotificationSettings）'的参数列表调用'registerUserNotificationSettings'

我搜索了有关任何更改的信息，但我找不到任何内容。我错过了一些明显的东西吗？

Answer 1

而不是像(NSSet(array: [restartGameCategory])) as Set<NSObject>)这样使用(NSSet(array: [restartGameCategory])) as? Set<UIUserNotificationCategory>)：

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

Answer 2

@Banning的答案会起作用，但可以用更加Swifty的方式做到这一点。您可以使用具有泛型类型NSSet的Set从头开始构建此代码，而不是使用UIUserNotificationCategory和向下转换。

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

值得注意的是，将代码分解为多行将有助于您确定问题的确切位置。在这种情况下，您的第二个错误只是第一个错误，因为表达式是内联的。

正如@stephencelis在下面的评论中熟练指出的那样，集合是ArrayLiteralConvertible，所以你可以将它一直减少到下面。

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

Swift 2中对registerUserNotificationSettings的更改？

2 个答案: