Local Notifications in iOS 8 With Xamarin

As of iOS 8, the user has to provide explicit permission for apps to respond to local notifications. This means that now, the first time the program is run, you need to run code such as:

[code lang="fsharp"]
//F#
UIUserNotificationSettings.GetSettingsForTypes(
UIUserNotificationType.Alert
||| UIUserNotificationType.Badge
||| UIUserNotificationType.Sound,
new NSSet())
|> UIApplication.SharedApplication.RegisterUserNotificationSettings
[/code]

or

[code lang="csharp"]
//C#
var settings = UIUserNotificationSettings.GetSettingsForTypes(
UIUserNotificationType.Alert
| UIUserNotificationType.Badge
| UIUserNotificationType.Sound,
new NSSet());
UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
[/code]

Which will present a user dialog. When they complete that dialog, the system will call the UIAppDelegate.DidRegisterUserNotificationSettings method. You can check the status using UIApplication.CurrentUserNotificationSettings.

If you try to send a notification without these settings being allowed, you will get a runtime error of the form:

Attempting to schedule a local notification {...} with an alert but haven't received permission from the user to display alerts
Attempting to schedule a local notification {...} with a sound but haven't received permission from the user to play sounds
Attempting to schedule a local notification {...} with a badge number but haven't received permission from the user to badge the application

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