How do you create custom notifications in Swift 3?

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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.

You could also use a protocol for this

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

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

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

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

And use it like, object: nil)

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.

Using Notification Center In Swift (How To) – LearnAppMaking, New in iOS 12: Adding a Custom UI and Interactivity in Local and Push Notifications To save time and help you to concentrate of customizing notifications 3) UNNotificationExtensionDefaultContentHidden : The Apple  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. Practice As Follows. You could also use a protocol for this

There is a cleaner (I think) way to achieve it

extension Notification.Name {

    static let onSelectedSkin = Notification.Name("on-selected-skin")

And then you can use it like this .onSelectedSkin, object: selectedSkin)

How to Add Custom UI in Local and Push Notifications, When I created my first custom notification, I read many articles and videos 3. Optional Step: Generating a .pem to send push notification by a  So everything about creating the certificate seems easy, and I see how you can send a notification from within Firebase. My question is, how do I customize this? I obviously don't want to have to go and type in a message every time in Firebase, I would like it to send a notification when someone gets a message or something. is defined as:

public func post(name aName: NSNotification.Name, object anObject: AnyObject?)

In Objective-C, the notification name is a plain NSString. In Swift, it's defined as NSNotification.Name.

NSNotification.Name is defined as:

public struct Name : RawRepresentable, Equatable, Hashable, Comparable {
    public init(_ rawValue: String)
    public init(rawValue: String)

This is kind of weird, since I would expect it to be an Enum, and not some custom struct with seemingly no more benefit.

There is a typealias in Notification for NSNotification.Name:

public typealias Name = NSNotification.Name

The confusing part is that both Notification and NSNotification exist in Swift

So in order to define your own custom notification, do somethine like:

public class MyClass {
    static let myNotification = Notification.Name("myNotification")

Then to call it:

NotificationCenter.default().post(name: MyClass.myNotification, object: self)

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Easier way:

let name:NSNotification.Name = NSNotification.Name("notificationName") name, object: nil)

Customizing the Appearance of Notifications, The NotificationCenter in Swift is super useful for sending data from called NSNotificationCenter – with the “NS” prefix – prior to Swift 3. You can also create custom notification centers, although you probably don't need to. You can also create custom notification centers, although you probably don’t need to. When you need to filter notifications, use the notification name and _sender_object. It’s common to register and remove observers in either: viewDidLoad() and dealloc, or; viewWillAppear(_:) and viewWillDisappear(_:)

You can add a custom initializer to NSNotification.Name

extension NSNotification.Name {
    enum Notifications: String {
        case foo, bar
    init(_ value: Notifications) {
        self = NSNotification.Name(value.rawValue)

Usage: Notification.Name(.foo), object: nil)

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Push Notifications Tutorial: Getting Started, Display a custom, interactive UI for your notification. An iOS device: Push notifications don't work in a simulator, so you'll need an actual device. To send and receive push notifications, you must perform three main tasks: Next, you need to create an App ID in your developer account and enable the  The Swift 3 gives you all the power you need for a full day’s work and entertainment. Next Gen CPU 10 th Gen Intel ® Core™ processors deliver approx. 2.5x-3x accelerated AI performance, up to 2x Graphics performance and nearly 3x faster wireless speeds 4 .

iOS 10: Creating Custom Notification Interfaces, With iOS 10, Apple now allows app developers to create custom the new UserNotifications framework in iOS 10, tvOS 10, and watchOS 3. 3) Create custom view in NotificationViewController.swift. When creating new notifications we need to add new category key and set its value to what we typed in the Info.plist in step 2): Remote:

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  • This is exactly they way I originally thought it should work - notifications should be enums. Thanks for the trick!
  • No problem! I edited the code to include conformation of the extension to NotificationName so the name property is only added to the enums that conform to the protocol.
  • Strictly equivalent but more logical IMO, you can define the extension on NotificationName (instead of RawRepresentable) like this: extension NotificationName where Self: RawRepresentable, Self.RawValue == String {
  • I'm using the code above. This is a static property.
  • Very clean, I like it alot
  • extension NSNotification.Name instead of extension Notification.Name . Otherwise Swift 3 complaints with 'Notification' is ambiguous for type lookup in this context
  • You get my upvote for making a typo in the string and thus demonstrating the value of typed notification names :P
  • It might be worth noting that this is the method suggested by Apple in WWDC 2016 Session 207
  • Good answer. Some comments: This is kind of weird, since I would expect it to be an Enum — An enum is a closed set. If Notification.Name were an enum, nobody would be able to define new notifications. We use structs for otherwise-enum-like types that need to allow adding new members. (See the swift-evolution proposal.)
  • The confusing part is that both Notification and NSNotification exist in SwiftNotification is a value type (a struct), so that it can benefit from Swift's semantics for value (im)mutability. Generally, Foundation types are dropping their "NS" in Swift 3, but where one of the new Foundation Value Types exists to supplant it, the old reference type sticks around (keeping the "NS" name) so that you can still use it when you need reference semantics or to subclass it. See the proposal.