咨询Flutter iOS应用防止截图的解决方案（已用flutter_windowmanager适配安卓）

针对iOS平台，你可以通过以下几种方式实现防止截图/录屏的功能：

1. 核心实现：通过MethodChannel调用iOS原生API #

iOS原生提供了UIView.isSecure属性，设置为true后，该视图将无法被截图或录屏。你可以通过Flutter的MethodChannel桥接原生代码实现：

Flutter 端代码 #

import 'package:flutter/services.dart';

class ScreenSecureManager {
  static const MethodChannel _channel = MethodChannel('your_app/screen_secure');

  /// 开启防截图模式
  static Future<void> enableSecureScreen() async {
    try {
      await _channel.invokeMethod('enableSecure');
    } on PlatformException catch (e) {
      print('开启防截图失败: ${e.message}');
    }
  }

  /// 关闭防截图模式
  static Future<void> disableSecureScreen() async {
    try {
      await _channel.invokeMethod('disableSecure');
    } on PlatformException catch (e) {
      print('关闭防截图失败: ${e.message}');
    }
  }
}

iOS 原生代码（AppDelegate.swift） #

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let controller = window?.rootViewController as! FlutterViewController
    let channel = FlutterMethodChannel(name: "your_app/screen_secure", binaryMessenger: controller.binaryMessenger)
    
    channel.setMethodCallHandler { [weak self] call, result in
      guard let self = self else { return }
      switch call.method {
      case "enableSecure":
        self.updateSecureScreenStatus(enabled: true)
        result(nil)
      case "disableSecure":
        self.updateSecureScreenStatus(enabled: false)
        result(nil)
      default:
        result(FlutterMethodNotImplemented)
      }
    }
    
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
  
  /// 更新视图的安全状态
  private func updateSecureScreenStatus(enabled: Bool) {
    guard let rootVC = window?.rootViewController else { return }
    
    // 给根视图控制器设置isSecure
    rootVC.view.isSecure = enabled
    
    // 如果是导航控制器，遍历所有子控制器设置
    if let navVC = rootVC as? UINavigationController {
      navVC.viewControllers.forEach { $0.view.isSecure = enabled }
    }
  }
}

2. 监听截图/录屏事件 #

如果需要在用户触发截图或录屏时做额外处理（比如弹窗提示），可以监听iOS的UIScreen.capturedDidChangeNotification通知：

iOS 原生端添加监听 #

在AppDelegate.swift中添加以下代码：

override func applicationDidBecomeActive(_ application: UIApplication) {
  super.applicationDidBecomeActive(application)
  NotificationCenter.default.addObserver(
    self,
    selector: #selector(onScreenCaptured),
    name: UIScreen.capturedDidChangeNotification,
    object: nil
  )
}

override func applicationWillResignActive(_ application: UIApplication) {
  super.applicationWillResignActive(application)
  NotificationCenter.default.removeObserver(
    self,
    name: UIScreen.capturedDidChangeNotification,
    object: nil
  )
}

@objc private func onScreenCaptured() {
  if UIScreen.main.isCaptured {
    // 通知Flutter端检测到截图/录屏
    let channel = FlutterMethodChannel(name: "your_app/screen_secure", binaryMessenger: window!.rootViewController as! FlutterViewController)
    channel.invokeMethod("screenCaptured", arguments: nil)
  }
}

Flutter 端监听事件 #

在需要处理的页面中添加监听：

@override
void initState() {
  super.initState();
  ScreenSecureManager._channel.setMethodCallHandler((call) async {
    if (call.method == 'screenCaptured') {
      // 弹出提示
      showDialog(
        context: context,
        builder: (_) => AlertDialog(
          title: const Text('提示'),
          content: const Text('禁止截图，请遵守相关规定'),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(context),
              child: const Text('知道了'),
            )
          ],
        ),
      );
    }
  });
}

注意事项 #

• UIView.isSecure会影响整个视图层级，如果你只需要对特定页面开启防截图，需要在页面进入/退出时分别调用开启/关闭方法。
• 该属性无法完全阻止所有截图方式（比如第三方工具通过系统漏洞截图），但能覆盖系统自带的截图和录屏功能。

内容的提问来源于stack exchange，提问作者Vepa Sabyrow