集成jpush for flutter，推送ios设备时显示推送设备为0，但是推送收到了。
集成极光推送futter库初始化完成后，推送ios设备，显示推送设备为0，点击推送手机上能收到通知。
ios端初始化log：
| JIGUANG | D - [JIGUANGService] Action - JPUSH begin Setup with appkey:d9d82e487ae2452f38da2dc0 channel: isProduction:FALSE advertisingIdentifier:
| JIGUANG | I - [JIGUANGService]
--------------------------- JPush Log ----------------------------
--------------------JPush SDK Version:3.1.2--build:71----------
--------------------JCore Lib Version:1.2.6--build:68----------
-----------------AppKey:d9d82e487ae2452f38da2dc0----------------
| JIGUANG | D - [JIGUANGService] Action - registrationID
| JIGUANG | D - [JIGUANGService] Action - registrationID
| JIGUANG | W - [JIGUANGService] 请将JPush的初始化方法，添加到[UIApplication application: didFinishLaunchingWithOptions:]方法中，否则JPush将不能准确的统计到通知的点击数量。参考文档：https://docs.jiguang.cn/jpush/client/iOS/ios_guide_new/#_6
| JIGUANG | I - [JIGUANGClientController] Action - jpush setup
| JIGUANG | I - [JIGUANGClientController] Action - setup
| JIGUANG | D - [JIGUANGUserDefaultsController] read from old keychain data
| JIGUANG | D - [JIGUANGUserDefaultsController] no old content, set new appKey
| JIGUANG | D - [JIGUANGPageFlow] trySetupSession
| JIGUANG | D - [JIGUANGPageFlow] setupSession