截屏状态监听 - iOS

继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 / 2, SCREEN_HEIGHT / 2, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2);

    [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, 0);

    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, 0, -imageSize.width);

        }

        else if (orientation == UIInterfaceOrientationLandscapeRight) {

            CGContextRotateCTM(context, -M_PI_2);

            CGContextTranslateCTM(context, -imageSize.height, 0);

        }

        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];

}

此次分享到此结束,希望内容能对大家实际有所帮助,有什么不足之处欢迎指点共同进步!