blocks|key|1860020|text|这不是那么简单，但正如Rob提到的，你可以保存照片资源的url，然后使用Photos框架获取它。您可以使用PHImageManager方法requestImageData获取它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1860021|import+UIKit
import+Photos
class+ViewController:+UIViewController,+UINavigationControllerDelegate,+UIImagePickerControllerDelegate+{
++++@IBOutlet+weak+var+imageView:+UIImageView!
++++let+galleryPicker+=+UIImagePickerController()
++++//+create+a+method+to+fetch+your+photo+asset+and+return+an+UIImage+on+completion
++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()
++++++++//+lets+add+a+selector+to+when+the+user+taps+the+image
++++++++imageView.isUserInteractionEnabled+=+true
++++++++imageView.addGestureRecognizer(UITapGestureRecognizer(target:+self,+action:+#selector(openPicker)))
++++++++//+request+authorization
++++++++switch+PHPhotoLibrary.authorizationStatus()+{
++++++++case+.authorized:
++++++++++++print("The+user+has+explicitly+granted+your+app+access+to+the+photo+library.")
++++++++++++return
++++++++case+.denied:
++++++++++++print("The+user+has+explicitly+denied+your+app+access+to+the+photo+library.")
++++++++case+.notDetermined:
++++++++++++PHPhotoLibrary.requestAuthorization+{+status+in
++++++++++++++++print("status",+status)
++++++++++++}
++++++++case+.restricted:
++++++++++++print("Your+app+is+not+authorized+to+access+the+photo+library,+and+the+user+cannot+grant+such+permission.")
++++++++default:+break
++++++++}
++++}
++++//+opens+the+image+picker+for+photo+library
++++@objc+func+openPicker(_+gesture:+UITapGestureRecognizer)+{
++++++++galleryPicker.sourceType+=+.photoLibrary
++++++++galleryPicker.delegate+=+self
++++++++present(galleryPicker,+animated:+true)
++++}
++++override+func+viewDidAppear(_+animated:+Bool)+{
++++++++super.viewDidAppear(animated)
++++++++self.imageView.contentMode+=+.scaleAspectFit
++++++++//+check+if+there+is+an+url+saved+in+the+user+defaults
++++++++//+and+fetch+its+first+object+(PHAsset)
++++++++if+let+assetURL+=+UserDefaults.standard.url(forKey:+"assetURL")+{
++++++++++++if+let+asset+=+PHAsset.fetchAssets(withALAssetURLs:+[assetURL],+options:+nil).firstObject+{
++++++++++++++++asset.asyncImageData+{+data,+_,+_,+_+in
++++++++++++++++++++print("fetched")
++++++++++++++++++++guard+let+data+=+data+else+{+return+}
++++++++++++++++++++self.imageView.image+=+UIImage(data:+data)
++++++++++++++++}
++++++++++++}+else+{
++++++++++++++++print("assetURL:",+assetURL)
++++++++++++++++self.imageView.image+=+UIImage(contentsOfFile:+assetURL.path)
++++++++++++}
++++++++}+else+{
++++++++++++print("no+assetURL+found")
++++++++}

++++}
++++func+imagePickerControllerDidCancel(_+picker:+UIImagePickerController)+{
++++++++dismiss(animated:+true)
++++++++print("canceled")
++++}
++++func+imagePickerController(_+picker:+UIImagePickerController,+didFinishPickingMediaWithInfo+info:+[UIImagePickerController.InfoKey+:+Any])+{

++++++++self.imageView.image+=+info[.originalImage]+as?+UIImage
++++++++if+let+phAsset+=+info[.phAsset]+as?+PHAsset+{
++++++++++++phAsset.asyncURL+{+url+in
++++++++++++++++guard+let+url+=+url+else+{+return+}
++++++++++++++++UserDefaults.standard.set(url,+forKey:+"assetURL")
++++++++++++++++print("assetURL+saved")
++++++++++++}
++++++++}
++++++++dismiss(animated:+true)
++++}
}|code-block|syntax|javascript|1860022|1860023|extension+PHAsset+{
++++func+asyncURL(_+completion:+@escaping+((URL?)+->+Void))+{
++++++++switch+mediaType+{
++++++++case+.image:
++++++++++++let+options:+PHContentEditingInputRequestOptions+=+.init()
++++++++++++options.canHandleAdjustmentData+=+{+_+in+true+}
++++++++++++requestContentEditingInput(with:+options)+{+editingInput,+_+in
++++++++++++++++completion(editingInput?.fullSizeImageURL)
++++++++++++}
++++++++case+.video:
++++++++++++let+options:+PHVideoRequestOptions+=+.init()
++++++++++++options.version+=+.original
++++++++++++PHImageManager.default()
++++++++++++++++.requestAVAsset(forVideo:+self,+options:+options)+{+asset,+_,+_+in
++++++++++++++++completion((asset+as?+AVURLAsset)?.url)
++++++++++++}
++++++++default:
++++++++++++completion(nil)
++++++++}
++++}
++++func+asyncImageData(version:+PHImageRequestOptionsVersion+=+.original,+completion:+@escaping++(Data?,+String?,+UIImage.Orientation,+[AnyHashable+:+Any]?)+->+())+{
++++++++let+options+=+PHImageRequestOptions()
++++++++options.version+=+version
++++++++PHImageManager.default()
++++++++++++.requestImageData(for:+self,+options:+options,+resultHandler:+completion)
++++}
}
extension+URL+{
++++var+phAsset:+PHAsset?+{
++++++++PHAsset.fetchAssets(withALAssetURLs:+[self],+options:+nil).firstObject
++++}
}|1860024|1860025|注意:不要忘记编辑您的信息列表，并添加“隐私-图片库使用说明”|1860026|Sample|offset|length|1860027|entityMap|0|LINK|mutability|MUTABLE|url|https://www.dropbox.com/s/9532ae6n0zs3slf/asset%2520urls.zip?dl=1^0|0|0|0|0|0|0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|J|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|13|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|14|8|@]|9|@$O|15|P|16|1|17]]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

It is not so simple but as mentioned by Rob you can save the photo asset url and later fetch it using the Photos framework. You can fetch them using PHImageManager method requestImageData. 

<pre><code>import UIKit
import Photos
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
 @IBOutlet weak var imageView: UIImageView!
 let galleryPicker = UIImagePickerController()
 // create a method to fetch your photo asset and return an UIImage on completion
 override func viewDidLoad() {
 super.viewDidLoad()
 // lets add a selector to when the user taps the image
 imageView.isUserInteractionEnabled = true
 imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(openPicker)))
 // request authorization
 switch PHPhotoLibrary.authorizationStatus() {
 case .authorized:
 print("The user has explicitly granted your app access to the photo library.")
 return
 case .denied:
 print("The user has explicitly denied your app access to the photo library.")
 case .notDetermined:
 PHPhotoLibrary.requestAuthorization { status in
 print("status", status)
 }
 case .restricted:
 print("Your app is not authorized to access the photo library, and the user cannot grant such permission.")
 default: break
 }
 }
 // opens the image picker for photo library
 @objc func openPicker(_ gesture: UITapGestureRecognizer) {
 galleryPicker.sourceType = .photoLibrary
 galleryPicker.delegate = self
 present(galleryPicker, animated: true)
 }
 override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)
 self.imageView.contentMode = .scaleAspectFit
 // check if there is an url saved in the user defaults
 // and fetch its first object (PHAsset)
 if let assetURL = UserDefaults.standard.url(forKey: "assetURL") {
 if let asset = PHAsset.fetchAssets(withALAssetURLs: [assetURL], options: nil).firstObject {
 asset.asyncImageData { data, _, _, _ in
 print("fetched")
 guard let data = data else { return }
 self.imageView.image = UIImage(data: data)
 }
 } else {
 print("assetURL:", assetURL)
 self.imageView.image = UIImage(contentsOfFile: assetURL.path)
 }
 } else {
 print("no assetURL found")
 }

 }
 func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
 dismiss(animated: true)
 print("canceled")
 }
 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

 self.imageView.image = info[.originalImage] as? UIImage
 if let phAsset = info[.phAsset] as? PHAsset {
 phAsset.asyncURL { url in
 guard let url = url else { return }
 UserDefaults.standard.set(url, forKey: "assetURL")
 print("assetURL saved")
 }
 }
 dismiss(animated: true)
 }
}
</code></pre>

<hr>

<pre><code>extension PHAsset {
 func asyncURL(_ completion: @escaping ((URL?) -&gt; Void)) {
 switch mediaType {
 case .image:
 let options: PHContentEditingInputRequestOptions = .init()
 options.canHandleAdjustmentData = { _ in true }
 requestContentEditingInput(with: options) { editingInput, _ in
 completion(editingInput?.fullSizeImageURL)
 }
 case .video:
 let options: PHVideoRequestOptions = .init()
 options.version = .original
 PHImageManager.default()
 .requestAVAsset(forVideo: self, options: options) { asset, _, _ in
 completion((asset as? AVURLAsset)?.url)
 }
 default:
 completion(nil)
 }
 }
 func asyncImageData(version: PHImageRequestOptionsVersion = .original, completion: @escaping (Data?, String?, UIImage.Orientation, [AnyHashable : Any]?) -&gt; ()) {
 let options = PHImageRequestOptions()
 options.version = version
 PHImageManager.default()
 .requestImageData(for: self, options: options, resultHandler: completion)
 }
}
extension URL {
 var phAsset: PHAsset? {
 PHAsset.fetchAssets(withALAssetURLs: [self], options: nil).firstObject
 }
}
</code></pre>

<hr>

Note: Don't forget to edit your info plist and add "Privacy - Photo Library Usage Description"

<a href="https://www.dropbox.com/s/9532ae6n0zs3slf/asset%20urls.zip?dl=1" rel="nofollow noreferrer">Sample</a>

I would like to access photos from the user's photo library in my app and I was looking at the UIImagePickerController to do so. However, I was wondering if it is possible to access and view the photos from the photo library without actually storing those photos in the app? So basically the app would store references to the selected photos, rather than storing the photos themselves. This is to prevent the app from taking up large amounts of space from storing each photo.

Thanks!

Swift Photo Library Access

我想要在我的应用程序中访问用户照片库中的照片，我正在查看UIImagePickerController来执行此操作。然而，我想知道是否有可能访问和查看照片库中的照片，而不是真正将这些照片存储在应用程序中？因此，基本上应用程序会存储对所选照片的引用，而不是存储照片本身。这是为了防止应用程序占用大量空间来存储每张照片。谢谢...

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