仅仅给大家提供代码，还搞不定的欢迎咨询。

void _sendIosPushNotification(BleMessage message, String deviceToken,

{bool debugMode = false}) async {

final Map<String, dynamic> header = {

"alg": "ES256",

"kid": GloabelConfiguration.keyId,

};

// 设置负载（Claims）

final Map<String, dynamic> payload = {

"iss": GloabelConfiguration.teamId,

"iat": DateTime.now().millisecondsSinceEpoch ~/ 1000, // 当前时间的秒数

};

final jwt = JWT(payload, header: header);

final token = jwt.sign(ECPrivateKey(GloabelConfiguration.pushPrivateKey),

algorithm: JWTAlgorithm.ES256);

// Use the correct APNs endpoint

final apnsEndpoint = debugMode

? 'https://api.sandbox.push.apple.com'

: 'https://api.push.apple.com';