ios 如何使用资产库在 UIImagePickerController 中获取文件名？

How to get file name in UIImagePickerController with Asset library?

提问by TechChain

I want to get the file name from UIImagePickerController. I do not want to use ALAssetLibrary because it is deprecated in iOS 9. I have used the following code but it always returns the image name as "Asset.jpg" for each file.

我想从UIImagePickerController. 我不想使用 ALAssetLibrary，因为它在 iOS 9 中已被弃用。我使用了以下代码，但它始终为每个文件返回图像名称为“Asset.jpg”。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {       
    let originalImage = (info[UIImagePickerControllerOriginalImage] as? UIImage)!
    let url = info[UIImagePickerControllerReferenceURL] as! NSURL
    imageData = UIImageJPEGRepresentation(originalImage, 100) as NSData?
    let data = UploadData()
    data.fileName = url.lastPathComponent     
    picker.dismiss(animated: true, completion: nil)
}

回答by Rajat

I will suggest you to use PhotosFramework to get the name of the image, below is the code to get name of selected image

我建议您使用PhotosFramework 来获取图像的名称，下面是获取所选图像名称的代码

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let imageURL = info[UIImagePickerControllerReferenceURL] as? URL {
        let result = PHAsset.fetchAssets(withALAssetURLs: [imageURL], options: nil)
        let asset = result.firstObject
        print(asset?.value(forKey: "filename"))

    }

    dismiss(animated: true, completion: nil)
}

回答by Damien D.

Before iOS 11

在 iOS 11 之前

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let imageURL = info[UIImagePickerControllerReferenceURL] as? URL {
        let result = PHAsset.fetchAssets(withALAssetURLs: [imageURL], options: nil)
        let assetResources = PHAssetResource.assetResources(for: result.firstObject!)

        print(assetResources.first!.originalFilename)
    }

    dismiss(animated: true, completion: nil)
}

After iOS 11

在 iOS 11 之后

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let asset = info[UIImagePickerControllerPHAsset] as? PHAsset {
        let assetResources = PHAssetResource.assetResources(for: asset)

        print(assetResources.first!.originalFilename)
    }

    dismiss(animated: true, completion: nil)
}

回答by Yaiba

Update 6th May 2018

2018 年 5 月 6 日更新

Forced unwrapped optionals sometimes return nil, I think it's because user use Camera to capture a new image instead of selecting one from Photos library. I updated the code to return a generated name when I see nil.

强制解包的选项有时会返回nil，我认为这是因为用户使用相机捕获新图像而不是从照片库中选择一个。当我看到 nil 时，我更新了代码以返回生成的名称。

Original answer

原答案

This works for me without having to rely on filenamekey (please excuse for force unwrap optionals :) )

这对我filename有用而不必依赖密钥（请原谅强制解包选项:)）

extension MyViewController : UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        guard let image = info[UIImagePickerControllerEditedImage] as? UIImage else {
            DDLogDebug("No image chosen")
            return
        }

        if let url = info[UIImagePickerControllerReferenceURL] as? URL {
            let assets = PHAsset.fetchAssets(withALAssetURLs: [url], options: nil)
            if let firstAsset = assets.firstObject,
            let firstResource = PHAssetResource.assetResources(for: firstAsset).first {
                fileName = firstResource.originalFilename
            } else {
                fileName = generateNameForImage()
            }
        } else {
            fileName = generateNameForImage()
        }

        DDLogDebug("File name = \(fileName)")

        dismiss(animated: true)
    }

    func generateNameForImage() -> String {
        return "IMG_random_string"
    }

}

回答by Gulfam Khan

Here is how I did it in swift 4

这是我如何在 swift 4 中做到的

if let url = info[UIImagePickerController.InfoKey.imageURL] as? URL {
        fileName = url.lastPathComponent
        fileType = url.pathExtension
    }

回答by Tony TRAN

You can try this for iOS 11

你可以在 iOS 11 上试试这个

 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let asset = info[UIImagePickerControllerPHAsset] as? PHAsset {
        if let fileName = (asset.value(forKey: "filename")) as? String {
            //Do your stuff here
        }
    }

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

Make sure you add this NSPhotoLibraryUsageDescription to your Infor.plist

确保将此 NSPhotoLibraryUsageDescription 添加到您的 Infor.plist

回答by luhuiya

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    var selectedFileName = ""
    if #available(iOS 11.0, *) {
        if let imageUrl = info[.imageURL] as? URL {
            selectedFileName = imageUrl.lastPathComponent
        }
    } else {
        if let imageURL = info[.referenceURL] as? URL {
            let result = PHAsset.fetchAssets(withALAssetURLs: [imageURL], options: nil)
            if let firstObject = result.firstObject {
                let assetResources = PHAssetResource.assetResources(for: firstObject)
                selectedFileName = assetResources.first?.originalFilename
            }
        }
    }

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

回答by Bassant Ashraf

import Photos

导入照片

func getFileName(info: [String : Any]) -> String {

    if let imageURL = info[UIImagePickerControllerReferenceURL] as? URL {
        let result = PHAsset.fetchAssets(withALAssetURLs: [imageURL], options: nil)
        let asset = result.firstObject
        let fileName = asset?.value(forKey: "filename")
        let fileUrl = URL(string: fileName as! String)
        if let name = fileUrl?.deletingPathExtension().lastPathComponent {
        print(name)
        return name
        }
    }
    return ""

}

call it inside the method "didFinishPickingMediaWithInfo" like so:

在方法“didFinishPickingMediaWithInfo”中调用它，如下所示：

let fileName = getFileName(info: info)

回答by COVID19

Code:

代码：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
    let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
    let imageName = imageURL.path!.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String
    let localPath = documentDirectory.stringByAppendingPathComponent(imageName)
    let image = info[UIImagePickerControllerOriginalImage] as UIImage
    let data = UIImagePNGRepresentation(image)
    data.writeToFile(localPath, atomically: true)
    let imageData = NSData(contentsOfFile: localPath)!
    let photoURL = NSURL(fileURLWithPath: localPath)
    let imageWithData = UIImage(data: imageData)!
    picker.dismissViewControllerAnimated(true, completion: nil)
}

回答by Khaled Khaldi

    let fileName = (info[.imageURL] as? URL)?.lastPathComponent

回答by FunkyKat

Swift 5, iOS 11+

斯威夫特 5，iOS 11+

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    let photo = info[.phAsset] as? PHAsset
    let filename = photo?.value(forKey: "filename") as! String
}