截屏狀態監聽 - iOS

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既接到電話狀態監聽的需求之後再次添加了截屏狀態的監聽,當使用 App 時若使用者執行截屏操作需要對目前狀態進行監聽操作,下面有兩種方法,其中可以替換截屏的圖片內容(Plan A),也可以彈出提示框(Plan B),廢話不多說步驟如下.

  1 #pragma mark - 監聽截屏  2 // Plan A  3 /**  4  監聽裝置截屏  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(@"考試截屏"); 15                                      [weakself userDidTakeScreenshot];//螢幕響應 16                                  }]; 17 } 18 /** 19  截屏響應 20  */ 21 - (void)userDidTakeScreenshot { 22     NSLog(@"檢測到截屏"); 23     //人為操作,擷取截屏圖片資料 24     UIImage *image = [self imageWithScreenshot]; 25     NSLog(@"userDidTakeScreenshot:\n%@", image); 26      27     UIImageView *imageScreenshot = [[UIImageView alloc] initWithImage:image];// 此處 image 資源可根據實際需求進行操作,展示當前截屏圖片或者替換成一張固定的圖片方式等等等! 28     imageScreenshot.frame = CGRectMake(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2); 29     [self.wkWebView addSubview:imageScreenshot];// 展示在當前 View 層級 30 } 31 /** 32  返回截屏資料 33   34  @return 返回截屏資料 35  */ 36 - (UIImage *)imageWithScreenshot { 37     NSData *imageData = [self dataWithScreenshotInPNGFormat]; 38     return [UIImage imageWithData:imageData]; 39 } 40 /** 41  擷取當前螢幕 42   43  @return 擷取當前螢幕 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:self102                             selector:@selector(checkScreenshots)103                                 name:UIApplicationUserDidTakeScreenshotNotification104                               object:nil];105 }106 - (void)checkScreenshots {107     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"108                                                         message:@"勿"109                                                        delegate:self110                                               cancelButtonTitle:@"YES"111                                               otherButtonTitles:@"NO", nil];112     [alertView show];113 }

 

 

此次分享到此結束,希望內容能對大家實際有所協助,有什麼不足之處歡迎指點共同進步!

 

截屏狀態監聽 - iOS