Disable Screen Capture/ScreenShot in React Native

问题:

I have came across few solutions specific for ios and Android to prevent screen-capturing and taking screenshots. But how do i disable screen-capturing in react native?

回答1:

In android

/android/app/src/main/java/com/{Project_Name}/MainActivity.java

write some Import Statements

import android.os.Bundle;
import android.view.WindowManager;

Prevent capture screen by setFlag secure use below code inside the MainActivity class

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
    }

If you want to remove flag secure

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);

iOS

// Overlay screen by added 2 two into appDelegate.m

   - (void)applicationWillResignActive:(UIApplication *)application {

// fill screen with our own colour
UIView *colourView = [[UIView alloc]initWithFrame:self.window.frame];
colourView.backgroundColor = [UIColor whiteColor];
colourView.tag = 1234;
colourView.alpha = 0;
[self.window addSubview:colourView];
[self.window bringSubviewToFront:colourView];

// fade in the view
[UIView animateWithDuration:0.5 animations:^{
  colourView.alpha = 1;
}];
}

- (void)applicationDidBecomeActive:(UIApplication \*)application {
// grab a reference to our coloured view
UIView \*colourView = [self.window viewWithTag:1234];
// fade away colour view from main view
[UIView animateWithDuration:0.5 animations:^{
colourView.alpha = 0;
} completion:^(BOOL finished) {
// remove when finished fading
[colourView removeFromSuperview];
}];
}

回答2:

Prevent Capture Screen

Android

Prevent capture screen by setFlag secure

getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);

If you want to remove flag secure

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);

回答3:

In android

/android/app/src/main/java/com/{Project_Name}/MainActivity.java

write some Import Statements

import android.os.Bundle;
import android.view.WindowManager;

Prevent capture screen by setFlag secure use below code inside the MainActivity class

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
    }

回答4:

So there is little work for the iOS side build on React Native platform. So be patient with me to read the following approach.

I am using the react-native-video package for playing media. My requirement was to show spinner if user has screen recording enabled.

1. From https://developer.apple.com/documentation/uikit/uiscreen/2921651-captured?language=objc I understood that captured property is set to YES. I added observer in AppDelegate.m, under didFinishLaunchingWithOptions method.

   [[UIScreen mainScreen] addObserver:self forKeyPath:@"captured" options:NSKeyValueObservingOptionNew context:nil];

2. Since RN allows communication with Native modules, I decided to add bridge so notify when capture flag is set to YES.

I created two files ScreenRecordingNotification.h and .m

.h

#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>
#ifndef ScreenCaptureNotification_h
#define ScreenCaptureNotification_h


@interface ScreenCaptureNotification : RCTEventEmitter <RCTBridgeModule>
-(void) isScreenCaptureEnabled:(BOOL)isCaptured;
@end

#endif /* ScreenCaptureNotification_h */

and .m looks like

#import <Foundation/Foundation.h>
#import "ScreenCaptureNotification.h"
#import <React/RCTLog.h>
@implementation ScreenCaptureNotification

+ (id)allocWithZone:(NSZone *)zone {
  static ScreenCaptureNotification *sharedInstance = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    sharedInstance = [super allocWithZone:zone];
  });
  return sharedInstance;
}

RCT_EXPORT_MODULE();

- (NSArray<NSString *> *)supportedEvents {
  return @[           
           @"isScreenCaptureEnabled"];
}

-(void) isScreenCaptureEnabled:(BOOL)isCaptured {
  [self sendEventWithName:@"isScreenCaptureEnabled" body:@{@"value": @(isCaptured)}];
}

@end

3. import #import "ScreenCaptureNotification.h" in AppDelegate and added the following method.

   - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
       if ([keyPath isEqualToString:@"captured"]){
         NSLog(@"Screen Capture is Enabled");
         RCTLog(@"Screen Capture is Enabled");
         if (@available(iOS 11.0, *)) {
           ScreenCaptureNotification *manager = [ScreenCaptureNotification allocWithZone: nil];
           [manager isScreenCaptureEnabled:UIScreen.mainScreen.isCaptured];
         }
       }
   }
   

This concludes changes at iOS side.

4. Now you need to add Listener in .js files for notification which iOS sending. Once you get notification, it's up to you to decide what to do with it. Roughly it will look like below.

  addListener() {  
    let bridge = new NativeEventEmitter(NativeModules.ScreenCaptureNotification);

    this.screenCaptureEnabled = bridge.addListener("isScreenCaptureEnabled",res => { 
      this.setState({ screenCapture: true })
    })
  }

and

render() {
  if (this.state.screenCapture) {
     //Show spinner
     return <Spinner />
  }
  return (
  <Vido uri ... /> 
  )
}

I am open to suggestions to make changes to this post. Don't forget to upvote if this post helped you.