iOS 10：如何在应用程序处于后台时显示传入的VOIP呼叫通知？ [英] iOS 10: How to show incoming VOIP call notification when app is in background?

问题描述

我正在处理音频/视频通话并试图接听来电通知循环播放1分钟当应用程序为后台时，WhatsApp显示在 iOS ，通知横幅隐藏并显示铃声1分钟。

I'm working on audio/video call and trying to get incoming call notification loop for 1 minute like WhatsApp shows in iOS when app is background, Notification banner hide and show with ringtone for 1 minute.

我试过这段代码，它只触发一次：

I have tried this code, it triggers only single time:

 UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
    content.title = [NSString stringWithFormat:@"Video Call from %@",userId];
    content.body = @"";
    content.userInfo = [userInfo mutableCopy];
    content.sound = [UNNotificationSound soundNamed:@""];

    NSDate *now = [NSDate date];
    now = [now dateByAddingTimeInterval:3];
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    [calendar setTimeZone:[NSTimeZone localTimeZone]];

    NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitTimeZone fromDate:now];

    UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:NO];
    UNNotificationRequest * request = [UNNotificationRequest requestWithIdentifier:@"INCOMING_VOIP_APN" content:content trigger:trigger];

    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    center.delegate = self;
    [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
        if (!error) {
            NSLog(@"PUSHKIT : INCOMING_VOIP_APN");
        }
    }];

我如何实现这一目标？我正在使用 UserNotifications.framework（iOS 10）和 PushKit 。

How can I achieve this? I'm using UserNotifications.framework (iOS 10) and PushKit.

推荐答案

我建议的是，本地通知仅在特定时间可见。您需要做的是在通话时设置本地通知或通知。当通知触发时，在通知的委托方法中，您必须在 NSTimer 。

What I would suggest is that the local notification is only visible for that particular time. What you have to do is set a local notification or notification at the time of call. When the notification fires, in the delegate method of the notification you will have to build a custom logic with help of NSTimer.

创建一个类似于要为通话显示的推送通知/视图的视图。将其添加到应用程序窗口，使其显示在所有视图的顶部。 3秒后删除此视图，在逻辑中您可以显示相同的视图1分钟。

Create a view similar to push notification/ or view which you want to show for the call. Add it to the Application Window so it is shown on top of all views. After 3 sec remove this view and in the logic you can show the same view for 1 min.

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