ios - 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 编程还很陌生。如上所述，我喜欢在将捕获的图像保存到相册之前将我自己的元数据插入到它们中。

我正在尝试使用这段代码来完成这项工作。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？

或者可能无法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

只需将以下代码转换为 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 key 添加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];

    }