Flutter集成Apple支付详细流程

import 'package:flutter/services.dart';
import 'package:in_app_purchase/in_app_purchase.dart';
 
// 初始化IAP
final InAppPurchaseConnection _connection = InAppPurchaseConnection.instance;
 
// 开始IAP流程
Future<void> startIap() async {
  // 确认是否支持IAP
  if (!_connection.isAvailable) {
    throw Exception('IAP不可用');
  }
 
  // 监听购买事件
  _connection.purchaseUpdatedStream.listen((purchaseDetailsList) {
    for (PurchaseDetails purchaseDetails in purchaseDetailsList) {
      if (purchaseDetails.status == PurchaseStatus.pending) {
        // 处理待定的购买
      } else if (purchaseDetails.status == PurchaseStatus.error) {
        // 处理购买错误
      } else if (purchaseDetails.status == PurchaseStatus.purchased) {
        // 处理已购买
      }
    }
  }, onDone: () {
    // 监听结束
  }, onError: (error) {
    // 处理错误
  });
 
  // 获取已购买的商品列表
  QueryPurchaseDetailsResponse purchased = await _connection.queryPurchases();
 
  // 处理已购买的商品
  for (PurchaseDetails purchase in purchased.purchases) {
    if (purchase.status == PurchaseStatus.purchased) {
      // 处理已购买的商品
    }
  }
 
  // 启动Apple付款流程
  final PurchaseParam purchaseParam = PurchaseParam(
    applicationUserName: null, // 如果需要，设置用户名
    productDetails: ProductDetails(id: 'com.example.product_id'), // 设置产品ID
  );
 
  // 发起购买请求
  InAppPurchaseConnection.instance
      .buyNonConsumable(purchaseParam: purchaseParam);
}

这段代码展示了如何在Flutter中初始化并使用In App Purchase插件来处理Apple付款。首先，它检查IAP服务是否可用，然后监听购买事件，并处理待定、错误和已购买的状态。接着，它查询已购买的商品列表，最后启动Apple付款流程。