Xamarin iOS 中的可操作推送通知

Question

var acceptAction = UNNotificationAction.FromIdentifier("AcceptAction", "Accept", UNNotificationActionOptions.None);
var declineAction = UNNotificationAction.FromIdentifier("DeclineAction", "Decline", UNNotificationActionOptions.None);
// Create category
var meetingInviteCategory = UNNotificationCategory.FromIdentifier("MeetingInvitation",
new UNNotificationAction[] { acceptAction, declineAction }, new string[] { }, UNNotificationCategoryOptions.CustomDismissAction);
// Register category
var categories = new UNNotificationCategory[] { meetingInviteCategory };
UNUserNotificationCenter.Current.SetNotificationCategories(new NSSet<UNNotificationCategory>(categories));

如何接收自定义的可操作推送通知，需要将上述代码放在哪个文件中？

Answer 1

在 iOS 应用可以向用户发送通知之前，必须向系统注册应用，并且由于通知会中断用户，因此应用必须在发送通知之前显式请求权限。

应用启动后，应立即请求通知权限，方法是将以下代码添加到AppDelegate的DoneLaunch方法并设置所需的通知类型 (UNAuthorizationOptions(：

...
using UserNotifications;
...

public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
{
....
//after iOS 10
if(UIDevice.CurrentDevice.CheckSystemVersion(10,0))
{
UNUserNotificationCenter center = UNUserNotificationCenter.Current;
center.RequestAuthorization(UNAuthorizationOptions.Alert | UNAuthorizationOptions.Sound | UNAuthorizationOptions.UNAuthorizationOptions.Badge, (bool arg1, NSError arg2) =>
{
});
center.Delegate = new NotificationDelegate();
}
else if(UIDevice.CurrentDevice.CheckSystemVersion(8, 0))
{
var settings = UIUserNotificationSettings.GetSettingsForTypes(UIUserNotificationType.Alert| UIUserNotificationType.Badge| UIUserNotificationType.Sound,new NSSet());
UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
}
return true;
}

iOS 10 的新增功能是，当应用位于前台并触发通知时，它可以以不同的方式处理通知。通过提供 UNUserNotificationCenter Delegate 并实现 UserNotificationCenter 方法，应用可以接管显示通知的责任。例如：

using System;
using ObjCRuntime;
using UserNotifications;

namespace xxx
{
public class NotificationDelegate:UNUserNotificationCenterDelegate
{
public NotificationDelegate()
{
}
public override void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
{
// Do something with the notification
Console.WriteLine("Active Notification: {0}", notification);
// Tell system to display the notification anyway or use
// `None` to say we have handled the display locally.
completionHandler(UNNotificationPresentationOptions.Alert|UNNotificationPresentationOptions.Sound);
}

public override void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
{
// Take action based on Action ID
switch (response.ActionIdentifier)
{
case "reply":
// Do something
break;
default:
// Take action based on identifier
if (response.IsDefaultAction)
{
// Handle default action...
}
else if (response.IsDismissAction)
{
// Handle dismiss action
}
break;
}
// Inform caller it has been handled
completionHandler();
}
}
}