获取从 UIImagePickerController 中选择的 UIImage 的 URL
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【中文标题】获取从 UIImagePickerController 中选择的 UIImage 的 URL【英文标题】：Getting URL of UIImage selected from UIImagePickerController 【发布时间】：2015-03-31 02:28:52 【问题描述】：我正在尝试为用户提供从照片库中选择的图像。因此我使用UIImagePickerController 进行选择。但是在文件系统中获取它的初始 URL 会出现问题（我需要这个用于 CKAsset）。
我的代码。
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])
let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
let path = imageURL.path!
let imageName = path.lastPathComponent
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentDirectory = paths.first as String!
let localPath = documentDirectory + "/" + imageName
let imageData = NSData(contentsOfFile: localPath)!
let image = UIImage(data: imageData)!
picker.dismissViewControllerAnimated(true, completion: nil)
imageURL 有点神秘。它描述了资产 URL，但在文件系统中没有。它看起来像：assets-library://asset/asset.JPG?id=B6C0A21C-07C3-493D-8B44-3BA4C9981C25&ext=JPG。
根据这个逻辑，路径是/asset.JPG，其中asset.JPG是图像的名称。
然后我正在访问我的 Documents 文件夹并尝试在那里找到一个带有路径的文件：
/Users/Eugene/Library/Developer/CoreSimulator/Devices/3C5E9A23-8220-4B37-BD14-F1E42EEC2C7C/data/Containers/Data/Application/20EBAAE2-6C6F-4651-A48F-16A222CCB3A2/Documents/asset.JPG
也很神秘，但似乎是不存在图像的真实路径...找不到具有该路径的图像。这让我感到恶心。
我必须从头开始保存图像吗？或者有没有其他方法可以走？
我浏览了几个使用 AssetsLibrary API 的教程，但没有发现任何有用的东西可以解决我的问题。提前谢谢！
【问题讨论】：
【参考方案1】：对于 Swift 5+ ；根据@Jaydip 的回答
if let imgUrl = info[UIImagePickerController.InfoKey.imageURL] as? URL
let imgName = imgUrl.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
let localPath = documentDirectory?.appending(imgName)
let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
let data = image.pngData()! as NSData
data.write(toFile: localPath!, atomically: true)
//let imageData = NSData(contentsOfFile: localPath!)!
let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
print(photoURL)
【讨论】：
感谢兄弟的工作【参考方案2】：let imgUrl = info[UIImagePickerController.InfoKey.imageURL] as? URL
【讨论】：
【参考方案3】：斯威夫特 4.2
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])
//obtaining saving path
let fileManager = FileManager.default
let documentsPath = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first
let imagePath = documentsPath?.appendingPathComponent("image.jpg")
// extract image from the picker and save it
if let pickedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage
let imageData = pickedImage.jpegData(compressionQuality: 0.75)
try! imageData?.write(to: imagePath!)
谢谢
【讨论】：
【参考方案4】：在 Swift 4 中
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
if let imgUrl = info[UIImagePickerControllerReferenceURL] as? URL
let imgName = imgUrl.lastPathComponent
let documentDirectory = NSTemporaryDirectory()
let localPath = documentDirectory.appending(imgName)
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
let data = UIImageJPEGRepresentation(image, 0.3)! as NSData
data.write(toFile: localPath, atomically: true)
let photoURL = URL.init(fileURLWithPath: localPath)
【讨论】：
仅供参考 - 自 ios 11.0 起，UIImagePickerController.InfoKey.referenceURL 已被弃用。【参考方案5】：
在 SWIFT 4 中你可以试试这个，它工作正常。
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
if let imgUrl = info[UIImagePickerControllerImageURL] as? URL
let imgName = imgUrl.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
let localPath = documentDirectory?.appending(imgName)
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
let data = UIImagePNGRepresentation(image)! as NSData
data.write(toFile: localPath!, atomically: true)
//let imageData = NSData(contentsOfFile: localPath!)!
let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
print(photoURL)
APPDEL.window?.rootViewController?.dismiss(animated: true, completion: nil)
【讨论】：
适用于 iOS +11.0【参考方案6】：检查此解决方案。
import AssetsLibrary
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
self.imagePicker = picker
if let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage
let controller = CropViewController(image: selectedImage )
controller.delegate = self
picker.presentViewController(controller, animated: true, completion: nil)
else if let imageUrl = info[UIImagePickerControllerReferenceURL] as? NSURL
let assetLibrary = ALAssetsLibrary()
assetLibrary.assetForURL(imageUrl , resultBlock: (asset: ALAsset!) -> Void in
if let actualAsset = asset as ALAsset?
let assetRep: ALAssetRepresentation = actualAsset.defaultRepresentation()
let iref = assetRep.fullResolutionImage().takeUnretainedValue()
let image = UIImage(CGImage: iref)
let controller = CropViewController(image: image)
controller.delegate = self
picker.presentViewController(controller, animated: true, completion: nil)
, failureBlock: (error) -> Void in
)
【讨论】：
【参考方案7】： func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])
//this block of code grabs the path of the file
let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
let imagePath = imageURL.path!
let localPath = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(imagePath)
//this block of code adds data to the above path
let path = localPath.relativePath!
let imageName = info[UIImagePickerControllerOriginalImage] as UIImage
let data = UIImagePNGRepresentation(imageName)
data?.writeToFile(imagePath, atomically: true)
//this block grabs the NSURL so you can use it in CKASSET
let photoURL = NSURL(fileURLWithPath: path)
【讨论】：
@Peter Kreinz，希望这个对您有所帮助【参考方案8】：好的，我已经解决了这个问题。
您所要做的只是获取图像 (info[UIImagePickerControllerOriginalImage] as UIImage) 并保存到给定目录。如果您只需要保存 1 张图片，则效果很好。下面的代码ID。
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)
【讨论】：
您能否更新您对 Swift 2 的回答？谢谢！ 在 Swift 3 中不起作用，我转换了代码使其可以编译，但返回的路径不指向所选图像 对于 Swift 3，检查这个解决方案：***.com/questions/4957972/… @majorton 保存 100 张图片的最佳方法是什么？以上是关于获取从 UIImagePickerController 中选择的 UIImage 的 URL的主要内容，如果未能解决你的问题，请参考以下文章