#UNNotificationRequest

[arthurknopper]

SwiftUI Local Notification Tutorial

Notifications can be used in an application to schedule an alert to notify the user about an event. These notifications contains a message and can include a type of media and a sound alert. Notifications initiated by apps running on a device are referred to as local notifications. In this tutorial a local notification is scheduled containing an image. SwiftUI requires Xcode 11 and MacOS Catalina, which can be downloaded at the Apple developer portal.

Open Xcode and either click Create a new Xcode project in Xcode’s startup window, or choose File > New > Project. In the template selector, select iOS as the platform, select the Single View App template, and then click Next. Enter SwiftUILocalNotificationTutorial as the Product Name, select SwiftUI as the User Interface and click Next. Choose a location to save the project on your Mac.

An image will be used as an attachment of the notification. Download the image and drag it inside the project folder. In the canvas, click Resume to display the preview. If the canvas isn’t visible, select Editor > Editor and Canvas to show it.

In the Project navigator, click to select ContentView.swift. Change the code inside the ContentView struct to

struct ContentView: View { var body: some View { Button("Send Notification") { // 1. UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { success, error in if success { print("authorization granted") } else if let error = error } // 2. let content = UNMutableNotificationContent() content.title = "Notification Tutorial" content.subtitle = "from ioscreator.com" content.body = " Notification triggered" content.sound = UNNotificationSound.default // 3. let imageName = "applelogo" guard let imageURL = Bundle.main.url(forResource: imageName, withExtension: "png") else let attachment = try! UNNotificationAttachment(identifier: imageName, url: imageURL, options: .none) content.attachments = [attachment] // 4. let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false) let request = UNNotificationRequest(identifier: "notification.id.01", content: content, trigger: trigger) // 5. UNUserNotificationCenter.current().add(request) } } }

The UNUserNotificationCenter manages the notification-related activities. To use the notification the user needs to be asked for permission with the requestAuthorization method.

The UNMutableNotificationContent object contains the data of the notification.

The UNNotificationAttachment object contains the media content of the notification.

An UNNotificationRequest is generated which will trigger at the timeinterval of 10 seconds.

The notification is scheduled for delivery.

Build and Run the project. When the “Send Notification” button is clicked. The user will be asked for permission and when granted the notification is scheduled.

Press the home icon to put the app in the background. After 10 seconds the notifcation will be triggered.,

The source code of the SwiftUILocalNotificationTutorial can be downloaded at the ioscreator repository on Github.

#SwiftUI #iOS13

[arthurknopper]

Local Notification iOS Tutorial

Local notifications are a way for an application that isn’t running in the foreground to let its users know it has information for them. In iOS 10 Apple introduces rich notifications, which can include different type of media . In this tutorial we will create a local notification including an image. This tutorial is made with Xcode 10 and built for iOS 12.

Open Xcode and create a new Single View App.

For product name, use IOSLocalNotificationTutorial and then fill out the Organization Name and Organization Identifier with your customary values. Enter Swift as Language and choose Next.

Go to the Storyboard and drag a Button to the Main View and give it a title of "Send Local Notfication".  Select the Resolve Auto Layout Issues button and select Reset to Suggested Constraints.

The Storyboard should look like this.

Open the Assistant Editor and make sure the ViewController.swift file is visible. Ctrl and drag from Button to the ViewController class to create the following Action.

Go to the ViewController.swift file and import the UserNotifications framework

import UserNotifications

Change the viewDidLoad method to

override func viewDidLoad() { super.viewDidLoad() UNUserNotificationCenter.current().requestAuthorization(options: [.alert]) { (granted, error) in if granted { print("yes") } else { print("No") } } }

The UNUserNotificationCenter manages the notification-related activities. To use the notification the user needs to be asked for permission with the requestAuthorization method.

An image will be used as an attachment of the notification. Download the image and drag it inside the project folder. Next, implement the sendNotification action method

@IBAction func sendNotification(_ sender: Any) { // 1 let content = UNMutableNotificationContent() content.title = "Notification Tutorial" content.subtitle = "from ioscreator.com" content.body = " Notification triggered" // 2 let imageName = "applelogo" guard let imageURL = Bundle.main.url(forResource: imageName, withExtension: "png") else { return } let attachment = try! UNNotificationAttachment(identifier: imageName, url: imageURL, options: .none) content.attachments = [attachment] // 3 let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 10, repeats: false) let request = UNNotificationRequest(identifier: "notification.id.01", content: content, trigger: trigger) // 4 UNUserNotificationCenter.current().add(request, withCompletionHandler: nil) }

The UNMutableNotificationContent object contains the data of the notification.

The UNNotificationAttachment object contains the media content of the notification.

An UNNotificationRequest is generated which will trigger at the timeinterval of 10 seconds.

The notification is scheduled for delivery.

Build and Run the Project. The user will be asked for permission.

Select Allow, select the "Send Local Notification" Button to schedule the Notification. Press the Home button in the Simulator(Shift + Command + H). Within 10 seconds the Notfication will be delivered.

You can download the source code of the IOSLocalNotificationTutorial at the ioscreator repository on Github. 

#Notification #iOS12