截屏状态监听 - iOS

既接到电话状态监听的需求之后再次添加了截屏状态的监听,当使用 App 时若用户执行截屏操作需要对当前状态进行监听操作,下面有两种方法,其中可以替换截屏的图片内容(Plan A),也可以弹出提示框(Plan B),废话不多说步骤如下.

 #pragma mark - 监听截屏
 // Plan A
 /**
  监听设备截屏
  */
 - (void)registerTakeScreenShotNotice {
     kWeakSelf(self);
     NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
     [kNotificationCenter addObserverForName:UIApplicationUserDidTakeScreenshotNotification
                                      object:nil
                                       queue:mainQueue
                                  usingBlock:^(NSNotification * _Nonnull note) {

                                      NSLog(@"考试截屏");
                                      [weakself userDidTakeScreenshot];//屏幕响应
                                  }];
 }
 /**
  截屏响应
  */
 - (void)userDidTakeScreenshot {
     NSLog(@"检测到截屏");
     //人为操作,获取截屏图片数据
     UIImage *image = [self imageWithScreenshot];
     NSLog(@"userDidTakeScreenshot:\n%@", image);

     UIImageView *imageScreenshot = [[UIImageView alloc] initWithImage:image];// 此处 image 资源可根据实际需求进行操作,展示当前截屏图片或者替换成一张固定的图片方式等等等!
     imageScreenshot.frame = CGRectMake(SCREEN_WIDTH / , SCREEN_HEIGHT / , SCREEN_WIDTH / , SCREEN_HEIGHT / );
     [self.wkWebView addSubview:imageScreenshot];// 展示在当前 View 层级
 }
 /**
  返回截屏数据

  @return 返回截屏数据
  */
 - (UIImage *)imageWithScreenshot {
     NSData *imageData = [self dataWithScreenshotInPNGFormat];
     return [UIImage imageWithData:imageData];
 }
 /**
  获取当前屏幕

  @return 获取当前屏幕
  */
 - (NSData *)dataWithScreenshotInPNGFormat {
     // Source (Under MIT License):
     CGSize imageSize = CGSizeZero;
     UIInterfaceOrientation orientation = kApplication.statusBarOrientation;
     if (UIInterfaceOrientationIsPortrait(orientation)) {
         imageSize = SCREEN_RECT.size;
     }
     else {
         imageSize = CGSizeMake(SCREEN_HEIGHT, SCREEN_WIDTH);
     }

     UIGraphicsBeginImageContextWithOptions(imageSize, NO, );
     CGContextRef context = UIGraphicsGetCurrentContext();
     for (UIWindow *window in [kApplication windows]) {
         CGContextSaveGState(context);
         CGContextTranslateCTM(context, window.center.x, window.center.y);
         CGContextConcatCTM(context, window.transform);
         CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);

         // Correct for the screen orientation
         if (orientation == UIInterfaceOrientationLandscapeLeft) {
             CGContextRotateCTM(context, M_PI_2);
             CGContextTranslateCTM(context, , -imageSize.width);
         }
         else if (orientation == UIInterfaceOrientationLandscapeRight) {
             CGContextRotateCTM(context, -M_PI_2);
             CGContextTranslateCTM(context, -imageSize.height, );
         }
         else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
             CGContextRotateCTM(context, M_PI);
             CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
         }

         if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
             [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
         }
         else {
             [window.layer renderInContext:context];
         }

         CGContextRestoreGState(context);
     }

     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();

     return UIImagePNGRepresentation(image);
 }

 // Plan B
 - (void)intercepScreenshots {
 //    kWeakSelf(self);
 //    NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
 //    [kNotificationCenter addObserverForName:UIApplicationUserDidTakeScreenshotNotification object:nil queue:mainQueue usingBlock:^(NSNotification * _Nonnull note) {
 //        [weakself checkScreenshots];
 //    }];
     [kNotificationCenter addObserver:self
                             selector:@selector(checkScreenshots)
                                 name:UIApplicationUserDidTakeScreenshotNotification
                               object:nil];
 }
 - (void)checkScreenshots {
     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"
                                                         message:@"勿截图"
                                                        delegate:self
                                               cancelButtonTitle:@"YES"
                                               otherButtonTitles:@"NO", nil];
     [alertView show];
 }

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