Local Notification in WatchOS 3 - ios

Question

I'm using the WatchOS 3 beta and trying to initiate a local notification on the watch. The interface is just one button which calls the "buttonPushed" method in the code below. The app runs fine but I never get a notification. The app structure is the default from Xcode 8 for a WatchKit app.
This code is in the InterfaceController.swift file of the WatchKit extension
Am I missing something totally obvious?
#IBAction func buttonPushed() {
sendMyNotification()
}
func sendMyNotification(){
if #available(watchOSApplicationExtension 3.0, *) {
let center = UNUserNotificationCenter.current()
center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
// Enable or disable features based on authorization.
}
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey: "Hello!", arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: "Hello_message_body", arguments: nil)
content.sound = UNNotificationSound.default()
content.categoryIdentifier = "REMINDER_CATEGORY"
// Deliver the notification in five seconds.
let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5, repeats: false)
let request = UNNotificationRequest.init(identifier: "FiveSecond", content: content, trigger: trigger)
// Schedule the notification.
center.add(request ,withCompletionHandler: nil)
} else {
// Fallback on earlier versions
}
}

Answer 1

According to this. You should specify a unique and new identifier for request each time.
Mine:
let id = String(Date().timeIntervalSinceReferenceDate)
let request = UNNotificationRequest(identifier: id, content: content, trigger: trigger)

Answer 2

Swift 4 simple code
let content = UNMutableNotificationContent()
content.title = "How many days are there in one year"
content.subtitle = "Do you know?"
content.body = "Do you really know?"
content.badge = 1
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
let request = UNNotificationRequest(identifier: "timerDone", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)

Answer 3

Local Notification watchOS swift 4.0
var content = UNMutableNotificationContent()
content.title = "ALERT !"
content.body = msg
content.sound = UNNotificationSound.default() as? UNNotificationSound
// Time
var trigger: UNTimeIntervalNotificationTrigger?
trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false)
// Actions
var snoozeAction = UNNotificationAction(identifier: "Track", title: "Track", options: .foreground)
var category = UNNotificationCategory(identifier: "UYLReminderCategory", actions: [snoozeAction], intentIdentifiers: [] as? [String] ?? [String](), options: .customDismissAction)
var categories = Set<AnyHashable>([category])
center.setNotificationCategories(categories as? Set<UNNotificationCategory> ?? Set<UNNotificationCategory>())
content.categoryIdentifier = "UYLReminderCategory"
var identifier: String = stringUUID()
var request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
center.add(request, withCompletionHandler: {(_ error: Error?) -> Void in
if error != nil {
print("Something went wrong: \(error)")
}
})
Unique request identifier methods
func stringUUID() -> String {
let uuid = UUID()
let str: String = uuid.uuidString
return str
}
Objective C
// Objective-C
UNMutableNotificationContent *content = [UNMutableNotificationContent new];
content.title = #"ALERT !";
content.body = msg;
content.sound = [UNNotificationSound defaultSound];
// Time
UNTimeIntervalNotificationTrigger *trigger;
trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1
repeats:NO];
// Actions
UNNotificationAction *snoozeAction = [UNNotificationAction actionWithIdentifier:#"Track"
title:#"Track" options:UNNotificationActionOptionForeground];
// Objective-C
UNNotificationCategory *category = [UNNotificationCategory categoryWithIdentifier:#"UYLReminderCategory"
actions:#[snoozeAction] intentIdentifiers:#[]
options:UNNotificationCategoryOptionCustomDismissAction];
NSSet *categories = [NSSet setWithObject:category];
// Objective-C
[center setNotificationCategories:categories];
// Objective-C
content.categoryIdentifier = #"UYLReminderCategory";
NSString *identifier = [self stringUUID];
UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier
content:content trigger:trigger];
[center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
if (error != nil) {
NSLog(#"Something went wrong: %#",error);
}
}];
Unique request identifier methods
-(NSString *)stringUUID {
NSUUID *uuid = [NSUUID UUID];
NSString *str = [uuid UUIDString];
return str;
}