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.
1 #pragma mark - 监听截屏 2 // Plan A 3 /** 4 监听设备截屏 5 */ 6 - (void)registerTakeScreenShotNotice { 7 kWeakSelf(self); 8 NSOperationQueue *mainQueue = [NSOperationQueue mainQueue]; 9 [kNotificationCenter addObserverForName:UIApplicationUserDidTakeScreenshotNotification 10 object:nil 11 queue:mainQueue 12 usingBlock:^(NSNotification * _Nonnull note) { 13 14 NSLog(@"考试截屏"); 15 [weakself userDidTakeScreenshot];//屏幕响应 16 }]; 17 } 18 /** 19 截屏响应 20 */ 21 - (void)userDidTakeScreenshot { 22 NSLog(@"检测到截屏"); 23 //人为操作,获取截屏图片数据 24 UIImage *image = [self imageWithScreenshot]; 25 NSLog(@"userDidTakeScreenshot: %@", image); 26 27 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! 28 imageScreenshot.frame = CGRectMake(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2); 29 [self.wkWebView addSubview:imageScreenshot];// 展示在当前 View 层级 30 } 31 /** 32 返回截屏数据 33 34 @return 返回截屏数据 35 */ 36 - (UIImage *)imageWithScreenshot { 37 NSData *imageData = [self dataWithScreenshotInPNGFormat]; 38 return [UIImage imageWithData:imageData]; 39 } 40 /** 41 获取当前屏幕 42 43 @return 获取当前屏幕 44 */ 45 - (NSData *)dataWithScreenshotInPNGFormat { 46 // Source (Under MIT License): 47 CGSize imageSize = CGSizeZero; 48 UIInterfaceOrientation orientation = kApplication.statusBarOrientation; 49 if (UIInterfaceOrientationIsPortrait(orientation)) { 50 imageSize = SCREEN_RECT.size; 51 } 52 else { 53 imageSize = CGSizeMake(SCREEN_HEIGHT, SCREEN_WIDTH); 54 } 55 56 UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0); 57 CGContextRef context = UIGraphicsGetCurrentContext(); 58 for (UIWindow *window in [kApplication windows]) { 59 CGContextSaveGState(context); 60 CGContextTranslateCTM(context, window.center.x, window.center.y); 61 CGContextConcatCTM(context, window.transform); 62 CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y); 63 64 // Correct for the screen orientation 65 if (orientation == UIInterfaceOrientationLandscapeLeft) { 66 CGContextRotateCTM(context, M_PI_2); 67 CGContextTranslateCTM(context, 0, -imageSize.width); 68 } 69 else if (orientation == UIInterfaceOrientationLandscapeRight) { 70 CGContextRotateCTM(context, -M_PI_2); 71 CGContextTranslateCTM(context, -imageSize.height, 0); 72 } 73 else if (orientation == UIInterfaceOrientationPortraitUpsideDown) { 74 CGContextRotateCTM(context, M_PI); 75 CGContextTranslateCTM(context, -imageSize.width, -imageSize.height); 76 } 77 78 if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) { 79 [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES]; 80 } 81 else { 82 [window.layer renderInContext:context]; 83 } 84 85 CGContextRestoreGState(context); 86 } 87 88 UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 89 UIGraphicsEndImageContext(); 90 91 return UIImagePNGRepresentation(image); 92 } 93 94 // Plan B 95 - (void)intercepScreenshots { 96 // kWeakSelf(self); 97 // NSOperationQueue *mainQueue = [NSOperationQueue mainQueue]; 98 // [kNotificationCenter addObserverForName:UIApplicationUserDidTakeScreenshotNotification object:nil queue:mainQueue usingBlock:^(NSNotification * _Nonnull note) { 99 // [weakself checkScreenshots]; 100 // }]; 101 [kNotificationCenter addObserver:self 102 selector:@selector(checkScreenshots) 103 name:UIApplicationUserDidTakeScreenshotNotification 104 object:nil]; 105 } 106 - (void)checkScreenshots { 107 UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" 108 message:@"勿截图" 109 delegate:self 110 cancelButtonTitle:@"YES" 111 otherButtonTitles:@"NO", nil]; 112 [alertView show]; 113 }
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!