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)