Flutter防止截图插件pkb_no_screenshots的使用

Flutter 插件 pkb_no_screenshots 可以在你的应用中启用、禁用或切换截图支持。本指南将展示如何在 iOS 和 Android 平台上使用该插件。

使用

首先，确保你已经在你的项目中添加了 pkb_no_screenshots 插件。你可以在 pubspec.yaml 文件中添加以下依赖：

dependencies:
  pkb_no_screenshots: ^x.x.x

然后运行 flutter pub get 来获取新添加的依赖项。

接下来，我们可以在你的 Flutter 应用程序中添加一些按钮来控制截图功能。

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

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('PKB NO Screenshot'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Text(
                'ScreenshotIOS',
              ),
              ElevatedButton(
                onPressed: () {
                  DisableScreenshots.disable_enable('');
                },
                child: Text('Disabled'),
              ),

              const Text(
                'ScreenshotAndroid',
              ),
              ElevatedButton(
                child: const Text('Press to turn off screenshot'),
                onPressed: () {
                  DisableScreenshots.disable_enable('D');
                },
              ),
              ElevatedButton(
                child: const Text('Press to turn on screenshot'),
                onPressed: () {
                  DisableScreenshots.disable_enable('E');
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}

添加原生 iOS 代码

为了在 iOS 上实现截图禁用功能，你需要在 ios/Runner/AppDelegate.swift 中添加一些代码。

import UIKit
import Flutter

let CHANNEL = "disableScreenshots"
[@UIApplicationMain](/user/UIApplicationMain)
[@objc](/user/objc) class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let controller: FlutterViewController = window?.rootViewController as! FlutterViewController
    let channel = FlutterMethodChannel(name: CHANNEL, binaryMessenger: controller.binaryMessenger)
    channel.setMethodCallHandler({
      [weak self] (call: FlutterMethodCall, result: FlutterResult) -> Void in
      if (call.method == "disable") {
        self?.window?.makeSecureDisable()
      }
    })
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

extension UIWindow {
    func makeSecureDisable() {
        let field = UITextField()
        let view = UIView(frame: CGRect(x: 0, y: 0, width: field.frame.size.width, height: field.frame.size.height))
        field.isSecureTextEntry = true
        self.addSubview(field)
        self.layer.superlayer?.addSublayer(field.layer)
        field.layer.sublayers?.last!.addSublayer(self.layer)
        field.leftView = view
        field.leftViewMode = .always
    }
}