根据苹果的文档，voip 推送后必须跟随 calllkit 的调用，否则你的应用会被强行终止，多次违反后甚至再也收不到推送。而 callkit 因为众所周知的原因已经在大陆被禁，因此 voip 推送也基本无法在大陆使用。根据苹果文档提示，只能用普通推送（ usernotifications ）来代替 voip 推送（ pushkit ）。影响所有用 xcode11 编译的应用，xcode10 编译的暂时不受此限制，但是目前 app store 最低的编译要求为 xcode10.2，不用 xcode11 编译也许很快就无法上架。
目前微信依然还在用 pushkit 接受语音来电，显然还在使用 xcode10，因此也不可能支持 dark mode。
"
Important
On iOS 13.0 and later, if you fail to report a call to CallKit, the system will terminate your app. Repeatedly failing to report calls may cause the system to stop delivering any more VoIP push notifications to your app. If you want to initiate a VoIP call without using CallKit, register for push notifications using the UserNotifications framework instead of PushKit. For more information, see UserNotifications.
"
来源：
https://developer.apple.com/documentation/pushkit/pkpushregistrydelegate/2875784-pushregistry?language=objc
目前微信依然还在用 pushkit 接受语音来电，显然还在使用 xcode10，因此也不可能支持 dark mode。
"
Important
On iOS 13.0 and later, if you fail to report a call to CallKit, the system will terminate your app. Repeatedly failing to report calls may cause the system to stop delivering any more VoIP push notifications to your app. If you want to initiate a VoIP call without using CallKit, register for push notifications using the UserNotifications framework instead of PushKit. For more information, see UserNotifications.
"
来源：
https://developer.apple.com/documentation/pushkit/pkpushregistrydelegate/2875784-pushregistry?language=objc
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