Question

我们将EXIF数据显示为空白。我们使用的是Swift3和iOS10.3 我们引用了网址 - UIImagePickerController and extracting EXIF data from existing photos

但是，它没有解释如何在Swift中实现它。

下面拍照是我们的代码。

拍照

@IBAction func takePhoto(_ sender: AnyObject) {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.camera
            imagePicker.allowsEditing = false
            self.present(imagePicker, animated: true, completion: nil)
        }
    }

获取照片

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
            myImg.contentMode = .scaleToFill
            myImg.image = pickedImage
        }
        picker.dismiss(animated: true, completion: nil)
    }

保存照片

@IBAction func savePhoto(_ sender: AnyObject) {
        let imageData = UIImagePNGRepresentation(myImg.image!)
        let compresedImage = UIImage(data: imageData!)
        UIImageWriteToSavedPhotosAlbum(compresedImage!, nil, nil, nil)

        let alert = UIAlertController(title: "Saved", message: "Your image has been saved", preferredStyle: .alert)
        let okAction = UIAlertAction(title: "Ok", style: .default, handler: nil)
        alert.addAction(okAction)
        self.present(alert, animated: true, completion: nil)
    }

在此之后，当我们检查Photo的属性时 - EXIF数据为空白。

我已经阅读了与此相关的各种文章，但没有与Swift3相关的答案。真的很感激，如果有人可以帮助我们。谢谢。

Answer 1

回答这个问题有点晚了，但我发现这个剪辑提供了我所需的exif数据。

import Photos 
import PhotosUI

 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        let assetURL = info[UIImagePickerControllerReferenceURL] as! NSURL
        let asset = PHAsset.fetchAssets(withALAssetURLs: [assetURL as URL], options: nil)
        guard let result = asset.firstObject else {
            return
        }

        let imageManager = PHImageManager.default()
        imageManager.requestImageData(for: result , options: nil, resultHandler:{
            (data, responseString, imageOriet, info) -> Void in
            let imageData: NSData = data! as NSData
            if let imageSource = CGImageSourceCreateWithData(imageData, nil) {
                let imageProperties2 = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil)! as NSDictionary
                print("imageProperties2: ", imageProperties2)
            }

        })
        dismiss(animated: true, completion: nil)
    }

希望这有帮助

Answer 2

如果有人需要从avcapturesession捕获的图像中提取数据。

photoFileOutput?.captureStillImageAsynchronously(from: videoConnection, completionHandler: {(sampleBuffer, error) in
                if (sampleBuffer != nil) {
                        let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer!)
                        let image = self.processPhoto(imageData!)
                        let source: CGImageSource = CGImageSourceCreateWithData((imageData as! CFMutableData), nil)!

                        let metadata = CGImageSourceCopyPropertiesAtIndex(source, 0,nil) as! [String:Any]

                        print("exif data = \(metadata![kCGImagePropertyExifDictionary as String] as? [String : AnyObject]) ")

                        completionHandler(true)
                    } else {
                        completionHandler(false)
                    }
                }

Answer 3

**使用Photos API的iOS 13 SWIFT 5：

为此，您将需要该应用访问用户照片库。为此，请添加： NSPhotoLibraryUsageDescription到Info.plist并定义为什么需要访问。

然后在显示选择器之前，请求访问权限

import Photos


func openPicker() {
    let status = PHPhotoLibrary.authorizationStatus()
    let picker = UIImagePickerController()
    picker.sourceType = .photoLibrary

    if status == .notDetermined {
        PHPhotoLibrary.requestAuthorization({status in
            if status == .authorized {
                self.present(self.picker, animated: true)
            }
          })
    } else if status == .authorized {
        present(picker, animated: true)
    } else {
        print("NO ACCESS")
        return
    }
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    let asset = info[UIImagePickerController.InfoKey.phAsset] as! PHAsset

    PHImageManager.default().requestImageDataAndOrientation(for: asset, options: nil) { (data, responseString, imageOrient, info) in
        let imageData: NSData = data! as NSData
        if let imageSource = CGImageSourceCreateWithData(imageData, nil) {
            let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil)! as! [String: Any]
            print("properties: ", imageProperties)
        }
    }

    dismiss(animated: true, completion: nil)
}

Answer 4

FOR SWIFT 4 +

在didFinishPickingMediaWithInfo中添加以下内容：

 let dictionary : NSDictionary = info[UIImagePickerController.InfoKey.mediaMetadata] as! NSDictionary


    let exif = dictionary.value(forKey: "{Exif}") as! NSDictionary
    let xPixels = exif.value(forKey: "PixelXDimension") as! Int 
    let yPixels = exif.value(forKey: "PixelYDimension") as! Int

    print(exif as Any) // EXIF DICTIONARY
    print(xPixels) // exif contents(dimensions)
    print(yPixels)

在swift＃3中获取捕获图像的EXIF元数据

4 个答案: