CGImageRef grayscaleImage;  { CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();     CGContextRef bitmapCtx = CGBitmapContextCreate(bwbuffer, width, height, 8, width, colorSpace, (CGBitmapInfo)kCGImageAlphaNone);     grayscaleImage = CGBitmapContextCreateImage(bitmapCtx);     CFRelease(bitmapCtx);     CFRelease(colorSpace);   } UIImage *temp = [[UIImage alloc] initWithCGImage:grayscaleImage]; CFStringRef UTI= (CFStringRef)@"public.heic"; NSMutableData *newImageData = [NSMutableData data]; CGImageDestinationRef destination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)newImageData,UTI,1,NULL); CGImageDestinationAddImage(destination, temp.CGImage, (__bridge CFDictionaryRef)metaDataDictNew); CGImageDestinationFinalize(destination); This code running on iOS15. However iOS16 can't write grayscale HEIC image file.RGB image file is OK. The following were error message on console of xcode. writeImageAtIndex:867: *** CMPhotoCompressionSessionAddImage: err = kCMPhotoError_InvalidData [-17102]  (codec: 'hvc1') I can't find this error code in the Apple Support site also Documentation. Best regards.

Hello All. iOS15 can't play sound sound only Local Notification. Before iOS15 I can use following code.title, body and subtitle is @"" (No charactor). UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init]; content.title = @""; content.body = @""; content.subtitle = @""; content.sound = [UNNotificationSound soundNamed:@"test"]; When iOS15, I need add content.title for play sound. I don't want display Notification on banner and notification center also Lock Screen. I want use Sound only Local Notification. Is it a specification of iOS15 or BUGS?