你如何在 Swift 3 中创建自定义通知? [英] How do you create custom notifications in Swift 3?

问题描述

在 Objective-C 中，自定义通知只是一个普通的 NSString，但在 Swift 3 的 WWDC 版本中并不明显.

In Objective-C, a custom notification is just a plain NSString, but it's not obvious in the WWDC version of Swift 3 just what it should be.

推荐答案

您也可以为此使用协议

protocol NotificationName {
    var name: Notification.Name { get }
}

extension RawRepresentable where RawValue == String, Self: NotificationName {
    var name: Notification.Name {
        get {
            return Notification.Name(self.rawValue)
        }
    }
}

然后将您的通知名称定义为您想要的任何enum.例如:

And then define your notification names as an enum anywhere you want. For example:

class MyClass {
    enum Notifications: String, NotificationName {
        case myNotification
    }
}

然后像这样使用

NotificationCenter.default.post(name: Notifications.myNotification.name, object: nil)

通过这种方式，通知名称将与 Foundation Notification.Name 分离.如果 Notification.Name 的实现发生变化，您只需修改您的协议.

This way the notification names will be decoupled from the Foundation Notification.Name. And you will only have to modify your protocol in case the implementation for Notification.Name changes.

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