ios - 如何从 UIImagePickerController 获取用相机拍摄的图像名称

Question

下面的代码对于从图库中挑选的图像工作得非常好。但如果用相机拍摄则不起作用。我尝试将图像保存到存储中并再次读取，但我无法做到这一点。那么有人可以帮助我吗？谢谢。

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


    if let referenceUrl = info[UIImagePickerControllerReferenceURL] as? NSURL, image = info[UIImagePickerControllerOriginalImage] as? UIImage  {
            let phAsset = PHAsset.fetchAssetsWithALAssetURLs([referenceUrl], options: nil).lastObject as! PHAsset
            PHImageManager.defaultManager().requestImageDataForAsset(phAsset, options: PHImageRequestOptions(), resultHandler: { (imagedata, dataUTI, orientation, info) in
                if info!.keys.contains(NSString(string: "PHImageFileURLKey")) {
                    let path = info![NSString(string: "PHImageFileURLKey")] as! NSURL
                    print("path q\(path)")

                    self.mImageUrl = path
                    self.mlocalPath = path.path
                    self.mImageExtension = path.pathExtension
                    self.mImageName = path.lastPathComponent!
                    print("mImageName q\(self.mImageName)")
                }

            })
    }

    dismissViewControllerAnimated(true, completion: nil)

}

Answer 1

Swift 5+

正如前面的答案所建议的，该图像尚未存储在图库中，因此没有imageName。您需要将其存储在画廊中。使用下面的 Helper 类从 FileManager 保存和获取图像。

感谢这个Answer

class CameraImageManager {
    
    static let shared = CameraImageManager()

   public func saveImage(imageName: String, image: UIImage) {

        guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }

        let fileName = imageName
        let fileURL = documentsDirectory.appendingPathComponent(fileName)
        guard let data = image.jpegData(compressionQuality: 1) else { return }

        //Checks if file exists, removes it if so.
        if FileManager.default.fileExists(atPath: fileURL.path) {
            do {
                try FileManager.default.removeItem(atPath: fileURL.path)
                print("Removed old image")
            } catch let removeError {
                print("couldn't remove file at path", removeError)
            }

        }

        do {
            try data.write(to: fileURL)
        } catch let error {
            print("error saving file with error", error)
        }

    }

    public func getImagePathFromDiskWith(fileName: String) -> URL? {

        let documentDirectory = FileManager.SearchPathDirectory.documentDirectory

        let userDomainMask = FileManager.SearchPathDomainMask.userDomainMask
        let paths = NSSearchPathForDirectoriesInDomains(documentDirectory, userDomainMask, true)

        if let dirPath = paths.first {
            let imageUrl = URL(fileURLWithPath: dirPath).appendingPathComponent(fileName)
            return imageUrl
        }

        return nil
    }

   public func loadImageFromDiskWith(fileName: String) -> UIImage? {

        let documentDirectory = FileManager.SearchPathDirectory.documentDirectory

        let userDomainMask = FileManager.SearchPathDomainMask.userDomainMask
        let paths = NSSearchPathForDirectoriesInDomains(documentDirectory, userDomainMask, true)

        if let dirPath = paths.first {
            let imageUrl = URL(fileURLWithPath: dirPath).appendingPathComponent(fileName)
            let image = UIImage(contentsOfFile: imageUrl.path)
            return image

        }

        return nil
    }

}

现在，在您的 imagePickerController didFinishPickingMediaWithInfo 回调函数中，您可以通过以下方式为图像分配名称并保存它。

public func imagePickerController(_ picker: UIImagePickerController,
                                  didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
    guard let image = info[.editedImage] as? UIImage else { return }
    let imageName = "RDV_" + UUID().uuidString
    CameraImageManager.shared.saveImage(imageName: imageName, image: image)
    print("IMAGE NAME IS: ", imageName)
}

希望有帮助。