fix(ios): 用系统网络请求唤起无线数据选择

Flutter 的接口请求不会触发系统选择框，进入前台后补一次 URLSession 请求。

ios/Runner/AppDelegate.swift

@@ -51,6 +51,15 @@ final class RunnerFlutterViewController: FlutterViewController {
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
 
+  override func applicationDidBecomeActive(_ application: UIApplication) {
+    super.applicationDidBecomeActive(application)
+    requestWirelessDataPrompt()
+  }
+
+  func requestWirelessDataPrompt() {
+    wirelessDataPrompt.requestSystemPrompt()
+  }
+
   func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
     GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
     registerWirelessDataChannel(engineBridge)

ios/Runner/SceneDelegate.swift

@@ -1,6 +1,11 @@
+// Author: fruit.com.cn
+
 import Flutter
 import UIKit
 
 class SceneDelegate: FlutterSceneDelegate {
-
+  override func sceneDidBecomeActive(_ scene: UIScene) {
+    super.sceneDidBecomeActive(scene)
+    (UIApplication.shared.delegate as? AppDelegate)?.requestWirelessDataPrompt()
+  }
 }

ios/Runner/WirelessDataPrompt.swift

@@ -4,15 +4,19 @@ import CoreTelephony
 import Flutter
 import Foundation
 
-/// 监听系统无线数据选择，供 Flutter 在首个接口请求前等待。
+/// 监听系统无线数据选择，并用 URLSession 唤起系统选择框。
 final class WirelessDataPrompt {
   static let channelName = "com.stormg.lumadrama/wireless-data"
   static let awaitDecisionMethod = "awaitDecision"
 
+  /// 系统选择框由 URLSession 触发，Dart 的 Socket 请求不会弹出。
+  private static let promptURL = URL(string: "https://captive.apple.com/hotspot-detect.html")
+
   private let cellularData = CTCellularData()
   private let lock = NSLock()
   private var pending: [FlutterResult] = []
   private var decided = false
+  private var didRequestPrompt = false
 
   init() {
     cellularData.cellularDataRestrictionDidUpdateNotifier = { [weak self] state in
@@ -22,7 +26,17 @@ final class WirelessDataPrompt {
     }
   }
 
-  /// 状态未选择时先挂起；用户点选后完成全部等待。
+  /// 应用进入前台后请求一次，促使系统弹出无线数据选择。
+  func requestSystemPrompt() {
+    guard !didRequestPrompt, let promptURL = Self.promptURL else {
+      return
+    }
+    didRequestPrompt = true
+    _ = cellularData.restrictedState
+    URLSession.shared.dataTask(with: promptURL) { _, _, _ in }.resume()
+  }
+
+  /// 未允许前先挂起；用户允许无线数据后再放行。
   func awaitDecision(_ result: @escaping FlutterResult) {
     lock.lock()
     if decided {
@@ -37,7 +51,7 @@ final class WirelessDataPrompt {
   }
 
   private func completeIfDecided(_ state: CTCellularDataRestrictedState) {
-    if state == .restrictedStateUnknown {
+    if state != .notRestricted {
       return
     }
     lock.lock()