CocoaHeads SKG #10 - Rich Push Notifications on iOS10

by @sprimp

Transcript

1. iOS 10 Rich Push
   Notifications
   CoacoaheadsSKG Dimitri James tsiflitzis
   

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2. iOS 10 push notifications have new functionality. We can view
   photos, videos or gifs within the notification.
   Tonight we'll go through some code snippets, examples and
   good practices so you could use them in your own apps.
   Intro
   

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3. Server Side
   

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4. Server Side App Opaque APNS Devices
   How they work
   

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5. How they work
   {
   aps: {
   alert: {
   “body”: “CocoaheadsSKG #10”,
   “title”: “Hello World!”
   }
   mutable-content: 1
   category: "rich-apns"
   }
   data: {
   attachment-url: "https://i.imgur.com/t4WGJQx.jpg"
   }
   }
   

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6. How they work
   The mutable-content fields tells iOS that the notification has
   content that can be changed by a service extension before
   delivery, and the attachment-url field contains the URL for the
   content to be downloaded.
   

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7. Client Side
   

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8. Create a Notification Service Extension
   

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9. 1. Download the image
   2. Save the image to disk
   3. Add the path of the image to a UNNotificationAttachment
   4. Send back the edited notification
   Steps to display the image in the notification
   

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10. let center = UNUserNotificationCenter.current()
    center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
    // actions based on whether notifications were authorized or not
    }
    application.registerForRemoteNotifications()
    Registering for APN in iOS10
    

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11. func application(_ application: UIApplication,
    didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
    print(deviceTokenString)
    /* send the device token to your server */
    }
    Obtaining the device token
    

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12. func application(_ application: UIApplication,
    didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("i am not available in simulator \(error)")
    }
    In case of error
    

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13. UNUserNotificationCenter.current().getNotificationSettings(){ (setttings) in
    switch setttings.soundSetting{
    case .enabled:
    print("enabled sound setting")
    case .disabled:
    print("setting has been disabled")
    case .notSupported:
    print("something vital went wrong here")
    }
    }
    If you need to know the permissions granted
    

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14. In your Notification extension
    In the following code, we are walking through the apns's payload for the dictionary named
    data that contains the key attachment-url. If it exists, we download the image from the URL
    which is the key's value.
    The URLSession downloads the media to temporary storage and appends a .tmp file
    extension, which needs to be removed so that the application can infer the file type and
    display it. This is done by moving the temporary file to the device’s File Manager.
    

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15. override func didReceive(_ request: UNNotificationRequest,
    withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
    self.contentHandler = contentHandler
    self.bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
    /* Get the custom data from the notification payload */
    if let notificationData = request.content.userInfo["data"] as? [String: String] {
    /* Grab the attachment */
    if let urlString = notificationData["attachment-url"], let fileUrl = URL(string: urlString) {
    /* Download the attachment */
    URLSession.shared.downloadTask(with: fileUrl) { (location, response, error) in
    if let location = location {
    /* Move temporary file to remove .tmp extension */
    let tmpDirectory = NSTemporaryDirectory()
    let tmpFile = "file://".appending(tmpDirectory).appending(fileUrl.lastPathComponent)
    let tmpUrl = URL(string: tmpFile)!
    try! FileManager.default.moveItem(at: location, to: tmpUrl)
    /* Add the attachment to the notification content */
    if let attachment = try? UNNotificationAttachment(identifier: "", url: tmpUrl) {
    self.bestAttemptContent?.attachments = [attachment]
    }
    }
    /* Serve the notification content */
    self.contentHandler!(self.bestAttemptContent!)
    }.resume()
    }
    }
    In your Notification extension (Swift 3.0)
    

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16. Adding a custom UI to your notification
    

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17. In your Notification extension
    The Content Extension uses a NotificationViewController, which is a subclass of UIViewController.
    When you created the Content Extension, Xcode created the NotificationViewController.swift file, a MainInterface.storyboard and
    a plist file.
    The UNNotificationExtensionCategory key value is the same as the category value set before. This tells iOS that the push
    notification you’re triggering is handled with a Content Extension. It should be set in the notification payload.
    In MainInterface.storyboard, create the UI that your push notifications will display, just like a regular UIViewController.
    In NotificationViewController.swift, declare any IBOutlets and connect them to the Storyboard file.
    

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18. In action
    

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19. Ευχαριστούμε
    

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