【发布时间】：2019-09-26 11:49:34
【问题描述】：
我在 iOS 中有一个在测试期间失败的非续订订阅。我正在使用 Flutter 库 flutter_inapp_purchase。我正在让产品成功从 iTunesConnect 加载/获取，但在尝试购买时出现错误。在我成功输入 Sandbox 用户凭据后出现此错误。
我已经使用 Swift 内置应用程序的早期版本测试了这个沙盒用户和 IAP 设置，一切都按预期工作，所以我相当肯定这个问题是这个 Flutter 特有的。
Purchase Started !!
2019-05-08 11:44:47.819382-0500 Runner[16255:3743382]
Purchase Failed !!
2019-05-08 11:44:47.824961-0500 Runner[16255:3743449] flutter: Caused err. Set additionalSuccessPurchaseListenerIOS.
2019-05-08 11:44:47.825483-0500 Runner[16255:3743449] flutter: PlatformException(E_UNKNOWN, An unknown or unexpected error has occured. Please try again later., null)
2019-05-08 11:44:47.829865-0500 Runner[16255:3743449] [VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: PlatformException(ios, platform not supported, null)
#0 FlutterInappPurchase.buyProduct (package:flutter_inapp_purchase/flutter_inapp_purchase.dart:269:5)
<asynchronous suspension>
#1 _PurchaseSubscriptionPageState.buyProduct (package:undaunted_golf_flutter/PurchaseSubscriptionPage.dart:98:58)
<asynchronous suspension>
#2 _PurchaseSubscriptionPageState.build.<anonymous closure> (package:undaunted_golf_flutter/PurchaseSubscriptionPage.dart:344:25)
<asynchronous suspension>
#3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:511:14)
#4 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:566:30)
#5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:166:24)
#6 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:240:9)
#7 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:211:7)
#8 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
#9 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:225:20)
#10 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:199:22)
#11 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
#12 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
#13 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
#14 _rootRunUnary (dart:async/zone.dart:1136:13)
#15 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#16 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#17 _invoke1 (dart:ui/hooks.dart:233:10)
#18 _dispatchPointerDataPacket (dart:ui/hooks.dart:154:5)
2019-05-08 11:45:22.597897-0500 Runner[16255:3743779] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C4.1:2][0x10ab13540] get output frames failed, state 8196
2019-05-08 11:45:22.598180-0500 Runner[16255:3743779] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C4.1:2][0x10ab13540] get output frames failed, state 8196
2019-05-08 11:45:22.598613-0500 Runner[16255:3743779] TIC Read Status [4:0x0]: 1:57
2019-05-08 11:45:22.598659-0500 Runner[16255:3743779] TIC Read Status [4:0x0]: 1:57
【问题讨论】：