Flutter - iOS申请IDFA

1.启用广告追踪权限：

<key>NSUserTrackingUsageDescription</key>
<string>我们使用您的广告标识符来个性化广告内容</string>

2.iOS原生Method-Channel

import UIKit
import Flutter
import AdSupport
import AppTrackingTransparency

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    // Flutter 的初始化代码
    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    let idfaChannel = FlutterMethodChannel(name: "com.example.idfa", binaryMessenger: controller.binaryMessenger)

    // 设置平台通道的处理器
    idfaChannel.setMethodCallHandler { (call: FlutterMethodCall, result: @escaping FlutterResult) in
      if call.method == "getIDFA" {
        self.getIDFA(result: result)
      } else {
        result(FlutterMethodNotImplemented)
      }
    }

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  // 请求 ATT 权限并获取 IDFA
  private func getIDFA(result: @escaping FlutterResult) {
    if #available(iOS 14, *) {
      // 请求 App Tracking Transparency 权限
      ATTrackingManager.requestTrackingAuthorization(completionHandler: { status in
        switch status {
        case .authorized:
          // 用户授权后获取 IDFA
          let idfa = ASIdentifierManager.shared().advertisingIdentifier.uuidString
          result(idfa)
        default:
          result(FlutterError(code: "PERMISSION_DENIED", message: "User denied permission", details: nil))
        }
      })
    } else {
      // 对于 iOS 14 以下版本，直接获取 IDFA
      let idfa = ASIdentifierManager.shared().advertisingIdentifier.uuidString
      result(idfa)
    }
  }
}

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'IDFA Example',
      home: Scaffold(
        appBar: AppBar(title: Text('IDFA Example')),
        body: Center(
          child: ElevatedButton(
            onPressed: _getIDFA,
            child: Text('获取 IDFA'),
          ),
        ),
      ),
    );
  }

  Future<void> _getIDFA() async {
    const platform = MethodChannel('com.example.idfa');

    try {
      final String idfa = await platform.invokeMethod('getIDFA');
      print('IDFA: $idfa');
    } on PlatformException catch (e) {
      print('获取 IDFA 失败: ${e.message}');
    }
  }
}