如何从 UIImagePickerController 获取图像的 NSURL？上传到 Firebase

Question

因此已经启动了一些其他线程，因为人们对此有疑问。喜欢这个：Obtain NSURL from UIImagePickerController 和这个： Firebase storage upload works in Simulator but not on iPhone

我正在尝试遵循本教程： https://firebase.google.com/docs/storage/ios/upload-files#upload_from_a_local_file

我的视频可以上传，只是图片不行。

我的视频代码很简单：

if mediaType.isEqualToString(kUTTypeMovie as String) {
        let videoURL = info[UIImagePickerControllerMediaURL] as? NSURL

        fileToUploadURL = videoURL!
    }

但我的图像代码不起作用。这就是我最终得到的结果：

        let imageUrl = info["UIImagePickerControllerReferenceURL"] as? NSURL

        let assets = PHAsset.fetchAssetsWithALAssetURLs([imageUrl!], options: nil)
        let asset = assets.firstObject
        asset?.requestContentEditingInputWithOptions(nil, completionHandler: { (contentEditingInput, info) in
            let imageFile = contentEditingInput?.fullSizeImageURL
            // now call putFile with imageFile instead of imageUrl
            self.fileToUploadURL = imageFile
        })

似乎无论我做什么都会出错。 这是我当前的错误

2016-06-25 12:45:23.695 Chain[4187:1957121] Body file is unreachable: /var/mobile/Media/DCIM/100APPLE/IMG_0027.JPG
 Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_0027.JPG”       couldn’t be opened because you don’t have permission to view it."

控制台日志

2016-06-25 12:47:59.108 Chain[4187:1957121] 正文文件无法访问：/var/mobile/Media/DCIM/100APPLE/IMG_0027.JPG Error Domain=NSCocoaErrorDomain Code=257 "无法打开文件“IMG_0027.JPG”，因为您没有查看权限。" UserInfo={NSURL=file:///var/mobile/Media/DCIM/100APPLE/IMG_0027.JPG, NSFilePath=/var/mobile/Media/DCIM/100APPLE/IMG_0027.JPG, NSUnderlyingError=0x18b7ad40 {错误域=NSPOSIXErrorDomain 代码=1 "不允许操作"}} 2016-06-25 12:48:02.969 链 [4187:1957659] 插件 com.swiftkey.SwiftKeyApp.Keyboard 无效 可选（[“public.image”，“public.movi​​e”]） 信息：[“UIImagePickerControllerOriginalImage”：尺寸 {1836, 1454} 方向 0 比例 1.000000，“UIImagePickerControllerReferenceURL”：资产库：//asset/asset.JPG?id=5FE3480C-0A3E-42B2-B83B-93D0F321A3B2&ext=JPG，“UIImagePickerControllerMediaType ": public.image, "UIImagePickerControllerCropRect": NSRect: {{0, 0}, {1836, 1452}}, "UIImagePickerControllerEditedImage": 尺寸 {638, 504} 方向 0 比例 1.000000] fileToUploadURL：file:///var/mobile/Media/DCIM/100APPLE/IMG_0027.JPG 可选（[“public.image”，“public.movi​​e”]） 2016-06-25 13:01:58.845 链 [4187:1958957] 插件 com.swiftkey.SwiftKeyApp.Keyboard 无效 info: ["UIImagePickerControllerOriginalImage": 尺寸 {1836, 1454} 方向 0 比例 1.000000, "UIImagePickerControllerReferenceURL": assets-library://asset/asset.JPG?id=CFF5692E-2B93-407D-A9E4-48AC1BEDCAF2&ext=JPG, "UIImagePickerControllerMediaType ": public.image, "UIImagePickerControllerCropRect": NSRect: {{0, 0}, {1836, 1452}}, "UIImagePickerControllerEditedImage": 尺寸 {638, 504} 方向 0 比例 1.000000] fileToUploadURL: 无

2016-06-25 13:04:05.136 Chain[4187:1957121] _BSMachError: (os/kern) 无效能力 (20) 2016-06-25 13:04:05.138 链 [4187:1959394] _BSMachError: (os/kern) 无效名称 (15) 2016-06-25 13:04:05.146 链 [4187:1959394] 插件 com.swiftkey.SwiftKeyApp.Keyboard 无效 2016-06-25 13:04:05.220 链 [4187:1957188​​] CFNetwork SSLHandshake 失败 (-9806) 2016-06-25 13:04:05.661 链 [4187:1957121] 正文文件无法访问：/var/mobile/Media/DCIM/100APPLE/IMG_0015.JPG Error Domain=NSCocoaErrorDomain Code=257 "无法打开文件“IMG_0015.JPG”，因为您没有查看权限。" UserInfo={NSURL=file:///var/mobile/Media/DCIM/100APPLE/IMG_0015.JPG, NSFilePath=/var/mobile/Media/DCIM/100APPLE/IMG_0015.JPG, NSUnderlyingError=0x18bd4330 {错误域=NSPOSIXErrorDomain 代码=1 "不允许操作"}}

编辑：这是我的 didFinishPickingMedia：

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


    let mediaType = info[UIImagePickerControllerMediaType] as! NSString

    print ("info: \(info)")

    if mediaType.isEqualToString(kUTTypeImage as String) {
        var newImage: UIImage

        if let possibleImage = info["UIImagePickerControllerEditedImage"] as? UIImage {
            newImage = possibleImage
        }
        else if let possibleImage = info["UIImagePickerControllerOriginalImage"] as? UIImage {
            newImage = possibleImage
        }

        else {
            return
        }

      /// CAN NOT GET NSURL working, NEED TO USE NSDATA
        if let jpegData:NSData = UIImageJPEGRepresentation(newImage, 80) {
            currentMediaTypeToUpload = "img"
            fileToUploadDATA = jpegData
        }

    }


    else if mediaType.isEqualToString(kUTTypeMovie as String) {
        let videoURL = info[UIImagePickerControllerMediaURL] as? NSURL

        fileToUploadURL = videoURL!
        currentMediaTypeToUpload = "vid"
    }

Answer 1

解决办法在这里：how do I get NSURL for an image froom UIImagePickerController? for upload to Firebase

应用于我们的问题：

if  let referenceUrl = info[UIImagePickerControllerReferenceURL] {

        ////
        let assetURL = NSURL(string: String(referenceUrl))
        let assets = PHAsset.fetchAssetsWithALAssetURLs([assetURL!], options: nil)
        let asset: PHAsset = assets.firstObject as! PHAsset
        let manager = PHImageManager.defaultManager()
        let requestSize =   PHImageManagerMaximumSize
        manager.requestImageForAsset(asset, targetSize: requestSize, contentMode: .AspectFit, options: nil, resultHandler: {(result, info)->Void in
            // Result is a UIImage
            // Either upload the UIImage directly or write it to a file
            let imageData = UIImageJPEGRepresentation(result!, 0.8)
            let imagePath = FIRAuth.auth()!.currentUser!.uid + "/\(Int(NSDate.timeIntervalSinceReferenceDate() * 1000)).jpg"
            print ("filePath: ", imagePath)
            let metadata = FIRStorageMetadata()
            metadata.contentType = "image/jpeg"
            self.storageRef.child(imagePath)
                .putData(imageData!, metadata: metadata) { (metadata, error) in
                    if let error = error {
                        print("Error uploading: \(error.description)")
                        return
                    }
                    self.sendMessage([Constants.MessageFields.imageUrl: self.storageRef.child((metadata?.path)!).description])
                    print("Succeded")
            }

        })
    }

有了这个解决方案，我可以将我的文件上传到 firebase。

Answer 2

从UIImagePickerControllers 返回的NSURLs 具有assets-library:// 的方案，文件系统 URL 库（包括我们的库）不能直接访问该方案。您必须通过Photos 框架来检索内容，然后将该数据写入单独的NSURL 或将其上传到内存中。

  let assetURL = NSURL(string: "assets-library://path/to/content")
  let assets = PHAsset.fetchAssetsWithALAssetURLs([assetURL!], options: nil)
  let asset: PHAsset = assets.firstObject as! PHAsset

  let manager = PHImageManager.defaultManager()
  manager.requestImageForAsset(asset, targetSize: CGSize(width: 100.0, height: 100.0), contentMode: .AspectFit, options: nil, resultHandler: {(result, info)->Void in
    // Result is a UIImage
    // Either upload the UIImage directly or write it to a file
  })

此示例代码取自 here，作为我们 I/O 谈话 Zero to App: Develop with Firebase 的一部分。

Answer 3

我不确定您究竟是如何尝试从 UIImagePickerController 实例中获取图像，但您可以实现委托并获取 UIImage 实例，然后使用“内存中”方法将其上传到 FirbaseStorage：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage else { return }
    guard let imageData = UIImageJPEGRepresentation(image, 1.0) else { return }

    let storageRef = FIRStorage.storage().referenceForURL("gs://project-id.appspot.com")
    imagesRef.putData(imageData, metadata: nil) { metadata, error in
        ...
    }
 }