iOS设备原生代码实现防截屏录屏功能问题求助

你提供的基于UITextField的hack方法在iOS 13+版本中已失效，苹果调整了安全文本输入层的底层逻辑，导致该方法无法覆盖窗口内容。以下是两种可靠的原生实现方案：

方案一：使用官方isSecure属性（iOS 14+推荐） #

苹果在iOS14后提供了原生窗口安全属性，可直接阻止截屏和录屏，效果稳定。

针对Scene架构（iOS13+主流配置） #

修改SceneDelegate.swift：

import UIKit
import Flutter
import FirebaseCore

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        
        FirebaseApp.configure()
        let window = UIWindow(windowScene: windowScene)
        self.window = window
        
        // 开启窗口安全模式，直接阻止截屏/录屏
        windowScene.isSecure = true
        
        let flutterVC = FlutterViewController()
        window.rootViewController = flutterVC
        window.makeKeyAndVisible()
        GeneratedPluginRegistrant.register(with: flutterVC)
    }
}

针对旧版AppDelegate架构 #

修改AppDelegate.swift：

@main
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    FirebaseApp.configure()
    GeneratedPluginRegistrant.register(with: self)
    
    // 针对iOS14+开启窗口安全
    if let windowScene = self.window?.windowScene {
        windowScene.isSecure = true
    }
    
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }     
}

方案二：监听截屏/录屏通知（兼容iOS11+） #

如果需要兼容低版本iOS，或者仅在特定页面开启防护，可以通过系统通知监听状态，动态添加遮挡层。

示例代码（FlutterViewController扩展） #

import UIKit
import Flutter

class SecureFlutterVC: FlutterViewController {
    private var overlayView: UIView?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 注册录屏状态变化、截屏完成通知
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(updateOverlayStatus),
            name: UIScreen.capturedDidChangeNotification,
            object: nil
        )
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(updateOverlayStatus),
            name: UIApplication.userDidTakeScreenshotNotification,
            object: nil
        )
        
        // 初始检查状态
        updateOverlayStatus()
    }
    
    @objc private func updateOverlayStatus() {
        if UIScreen.main.isCaptured {
            // 录屏中，显示黑色遮挡层（可替换为自定义提示图）
            showSecurityOverlay()
        } else {
            // 停止录屏，移除遮挡层
            hideSecurityOverlay()
        }
    }
    
    private func showSecurityOverlay() {
        guard overlayView == nil else { return }
        overlayView = UIView(frame: view.bounds)
        overlayView?.backgroundColor = .black
        overlayView?.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        view.addSubview(overlayView!)
        view.bringSubviewToFront(overlayView!)
    }
    
    private func hideSecurityOverlay() {
        overlayView?.removeFromSuperview()
        overlayView = nil
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
}

方案对比 #

内容的提问来源于stack exchange，提问作者Naimish Patel