fire action only after notification appears (swift3) - ios

Question

My code uses a datePicker, that when the datePicker is changed and matches the current date of the user device. It fires a notification. However the AVSpeechUtterance I am using fires as soon as the datePickers time is changed not when the notification appears. I would like the AVSpeechUtterance and notification to be be fired at the same time.
import UIKit
import AVFoundation
import UserNotifications
class ViewController: UIViewController {
#IBOutlet var datePicker: UIDatePicker!
#IBAction func datePicker(_ sender: Any) {
let c = UNMutableNotificationContent()
c.title = "Lets Roll"
c.subtitle = "s"
c.body = "d"
let begin = AVSpeechUtterance(string: " Hello ")
let synthesizer = AVSpeechSynthesizer()
begin.voice = AVSpeechSynthesisVoice(language: "en-US")
begin.rate = 0.08
synthesizer.speak(begin)
let triggerDate = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: datePicker.date )
let t = UNCalendarNotificationTrigger(dateMatching: triggerDate, repeats: false)
let r = UNNotificationRequest(identifier: "any", content: c, trigger: t)
UNUserNotificationCenter.current().add(r, withCompletionHandler: nil)
}}
APP DELEAGATE
import AVFoundation
import UIKit
import UserNotifications
enum NotificationName: String {
case mySpeechNotification
}
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
if #available(iOS 10.0, *) {
let center = UNUserNotificationCenter.current()
center.delegate = self
center.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
if error != nil {
print("Ops, error trying to get authorization")
} else {
if !granted {
print("Dude, let me use notifications!")
}
}
}
}
return true
}
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
print("Oh, will present a notification, let's see the identifier: \(notification.request.identifier)")
if (notification.request.identifier == NotificationName.mySpeechNotification.rawValue) {
print("Speaking...")
} else {
print("Nothing to say...")
}
completionHandler(.alert)
let begin = AVSpeechUtterance(string: " Hello ")
begin.voice = AVSpeechSynthesisVoice(language: "en-US")
begin.rate = 0.08
let synthesizer = AVSpeechSynthesizer()
synthesizer.speak(begin)
}
}

Answer 1

You can perform your speech action when the notification is received. To achieve this you can:
If you're below iOS 10 you can use application:didReceiveLocalNotification: on UIAppplicatinoDelegate and then start your speech thing.
An idea of implementation would be to check some value on the notification to make sure that is the "speech notification" you triggered.
If you're on iOS 10+ you can use the UNUserNotificationCenterDelegateExample here you can take a look of an example implementation.

Answer 2

Have you tried with setting preUtteranceDelay for AVSpeechUtterance ?

Answer 3

import UIKit
import UserNotifications
import UserNotificationsUI //framework to customize the notification
class TestViewController: UIViewController {
#IBOutlet weak var datePicker: UIDatePicker!
let appDelegate = UIApplication.shared.delegate as! AppDelegate
override func viewDidLoad() {
super.viewDidLoad()
datePicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged)
}
//MARK:- Date Picker Value Changed
func dateChanged(_ sender: UIDatePicker) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM dd, yyyy"
let selectedDate = dateFormatter.string(from: datePicker.date)
let currentDate = dateFormatter.string(from: Date())
if selectedDate == currentDate{
self.triggerLocalNotification()
}
print(selectedDate)
}
//MARK:- Removed all pending notifications
func removeLocalNotification() {
print("Removed all pending notifications")
let center = UNUserNotificationCenter.current()
center.removePendingNotificationRequests(withIdentifiers: [appDelegate.requestIdentifier])
}
//MARK:- Trigger Local Notification
func triggerLocalNotification() {
self.removeLocalNotification()
let content = UNMutableNotificationContent()
content.title = "Title"
content.subtitle = "Subtitle"
content.body = "Body"
content.sound = UNNotificationSound.default()
let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5.0, repeats: false)
let request = UNNotificationRequest(identifier: appDelegate.requestIdentifier, content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request){(error) in
if (error != nil){
print(error?.localizedDescription)
}
}
}
}
//============AppDelegate=========
import UIKit
import AVFoundation
import UserNotifications
let center = UNUserNotificationCenter.current()
let requestIdentifier = "SampleRequest" //identifier is to cancel the notification request
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
//Requesting Authorization for User Interactions
center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
// Enable or disable features based on authorization.
}
center.delegate = self
return true
}
extension AppDelegate:UNUserNotificationCenterDelegate{
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
print("Tapped in notification")
}
//This is key callback to present notification while the app is in foreground
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
print("Notification being triggered")
let begin = AVSpeechUtterance(string: " Hello ")
begin.voice = AVSpeechSynthesisVoice(language: "en-US")
begin.rate = 0.08
let synthesizer = AVSpeechSynthesizer()
synthesizer.speak(begin)
//You can either present alert ,sound or increase badge while the app is in foreground too with ios 10
//to distinguish between notifications
if notification.request.identifier == requestIdentifier{
completionHandler( [.alert,.sound,.badge])
}
}
}
============