我想用这段代码为应用注册本地通知。
UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: UIUserNotificationType.Alert | UIUserNotificationType.Badge, categories: nil))使用 Swift 2.0 和 Xcode 7 时，错误是 Binary Operator "|" cannot be applied to two UIUserNotificationType operands。有人能帮忙吗？
I'm attempting to register local notifications for my application using this code:
UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: UIUserNotificationType.Alert | UIUserNotificationType.Badge, categories: nil))Using Swift 2.0 with Xcode 7, the error is Binary Operator "|" cannot be applied to two UIUserNotificationType operands. Could somebody help?
Swift 2 修改了许多通常这样使用的类型，让它们改为实现 OptionSetType 协议。因此它们支持类似数组的语法，你的这个例子可以写成下面这样。
let notificationOptions = UIUserNotificationSettings(forTypes: [.Alert, .Badge], categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(notificationOptions)另外，检查一个选项是否属于某个选项集时，也不再需要先做按位 AND 再检查 nil。可以直接询问选项集是否包含这个值，就像检查数组中有没有某个元素一样。
let notificationOptions = UIUserNotificationSettings(forTypes: [.Alert, .Badge], categories: nil)
if notificationOptions.types.contains(.Alert) {
// handle this option
}在 Swift 3 中，这些例子应当这样写。
let notificationOptions = UIUserNotificationSettings(types: [.alert, .badge], categories: nil)
UIApplication.shared.registerUserNotificationSettings(notificationOptions)以及
let notificationOptions = UIUserNotificationSettings(types: [.alert, .badge], categories: nil)
if notificationOptions.types.contains(.alert) {
// handle this option
}Swift 2 changed many of the types commonly used this way to implement the OptionSetType protocol instead. Consequently they support a syntax resembling arrays, so your particular example can be written like this.
let notificationOptions = UIUserNotificationSettings(forTypes: [.Alert, .Badge], categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(notificationOptions)Relatedly, checking whether an option belongs to an option set no longer requires a bitwise AND followed by testing for nil. Instead, ask whether that set contains the particular value, much as you would check an array for an element.
let notificationOptions = UIUserNotificationSettings(forTypes: [.Alert, .Badge], categories: nil)
if notificationOptions.types.contains(.Alert) {
// handle this option
}For Swift 3, write those examples this way:
let notificationOptions = UIUserNotificationSettings(types: [.alert, .badge], categories: nil)
UIApplication.shared.registerUserNotificationSettings(notificationOptions)and
let notificationOptions = UIUserNotificationSettings(types: [.alert, .badge], categories: nil)
if notificationOptions.types.contains(.alert) {
// handle this option
}也可以使用这个表达式。
let notificationOptions = UIUserNotificationType.Alert.union(UIUserNotificationType.Badge)This is another possible expression:
let notificationOptions = UIUserNotificationType.Alert.union(UIUserNotificationType.Badge)这个版本对我有用
//Successful version
var notificationOptions = UIUserNotificationSettings(forTypes: UIUserNotificationType([.Alert, .Badge, .Sound]), categories: nil)This version worked for me
//Successful version
var notificationOptions = UIUserNotificationSettings(forTypes: UIUserNotificationType([.Alert, .Badge, .Sound]), categories: nil)Swift 3 改变了这里的语法。
let notificationOptions = UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
UIApplication.shared.registerUserNotificationSettings(notificationOptions)Swift 3 changed the syntax here.
let notificationOptions = UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
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