是否可以在 Swift 中捕获的图像中添加自己的元数据

Question

我对 Swift 和 Ios 编程非常陌生。如上所述，我喜欢将我自己的元数据插入到捕获的图像中，然后再将它们保存到相册。

我正在尝试使用此代码完成此操作。保存的图像不包含我自己的元数据，而是它生成的元数据。谁能告诉我我做错了什么？

或者是否可以将自己的新元数据表添加到捕获的图像中？

非常感谢您的帮助

@IBAction func btnPressed(sender: UIButton) {

    capturePicture()
}

func capturePicture(){

    stillImageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
    session.addOutput(stillImageOutput)
    if let connection = self.stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) {

        self.stillImageOutput.captureStillImageAsynchronouslyFromConnection(connection) {
            (imageDataSampleBuffer, error) -> Void in

            if error == nil {

                var asset = ALAssetsLibrary()
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)

                // The Metadata of the Image
                var metadata:NSDictionary = CMCopyDictionaryOfAttachments(nil, imageDataSampleBuffer, CMAttachmentMode(kCMAttachmentMode_ShouldPropagate)).takeUnretainedValue()
                // My Metadata i want to add for testing purpose
                var meta : NSDictionary = ["Ersteller": "Dennis","Datum" : "25.04.14","Ort" : "Köln" ]

                asset.writeImageDataToSavedPhotosAlbum(imageData, metadata: meta as [NSObject : AnyObject], completionBlock: { (path:NSURL!, error:NSError!) -> Void in
                    println("\(path)")
                    println("\(error)")
                })
            }
        }
    }
}

Answer 1

只需将下面的代码转换为 Swift。下面的代码是用 Objective-C 编写的。您只需要创建 IPTC 或 TIFF 字典。使用合适的 IPTC/TIFF 键增加价值并在图像上写入字典数据（元数据）。

  - (void) imagePickerController: (UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info
    {

        UIImage *image = info[UIImagePickerControllerOriginalImage];

        //Here We Get current system date and time and store as a description of photo
        NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"dd-MM-yyyy"];
        NSLog(@"Date Formatter : %@",[dateFormatter stringFromDate:[NSDate date]]);

        //hh:mm:ss
        NSDateFormatter *timeFormatter=[[NSDateFormatter alloc] init];
        [timeFormatter setDateFormat:@"hh:mm:ss"];
        NSLog(@"time Formatterr : %@",[timeFormatter stringFromDate:[NSDate date]]);

    //ADD IPTC Dictionary Data as a META DATA
        NSMutableDictionary *iptcDict = [NSMutableDictionary dictionary];
        [iptcDict setValue:[[DataEngine sharedInstance] getAlbumName] forKey:(NSString *)kCGImagePropertyIPTCObjectTypeReference]; //folder name
        [iptcDict setValue:@“Renish Dadhaniya - 101" forKey:(NSString *)kCGImagePropertyIPTCObjectAttributeReference]; //add Image ID -get using query from database

        [iptcDict setValue:[NSString stringWithFormat:@“Renish Sweet Memory "forKey:(NSString *)kCGImagePropertyIPTCObjectName]; //Add Image name
        [iptcDict setValue:[dateFormatter stringFromDate:[NSDate date]]forKey:(NSString *)kCGImagePropertyIPTCDateCreated]; //Add Image Date
        [iptcDict setValue:[timeFormatter stringFromDate:[NSDate date]]forKey:(NSString *)kCGImagePropertyIPTCTimeCreated]; //Add Image Time

        NSMutableDictionary *dict = [NSMutableDictionary dictionary];
        [dict setValue:iptcDict forKey:(NSString *)kCGImagePropertyIPTCDictionary];

        //Get Iamge Url
         __block NSURL *imageAssestURL = nil;

        [asSetLib writeImageToSavedPhotosAlbum:image.CGImage metadata:dict completionBlock:^(NSURL* assetURL, NSError* error) {

            if (error) {
                NSLog(@"Image could not be safed to the assets library: %@", error);
                imageAssestURL = nil;
            }
            else {
                NSLog( @"Image safed successfully to assetURL: %@", assetURL);
                imageAssestURL = assetURL;

                       }

        }];

        [picker dismissViewControllerAnimated:YES completion:nil];

    }