如何解决获取保存到照片库的图像的 PHAsset/localIdentifier
我正在使用 UIImageWriteToSavedPhotosAlbum
将图像保存到“照片”应用。这是我发现的唯一可以让您执行此操作的功能。
这是我的代码:
import UIKit
import Photos
class ViewController: UIViewController {
/// photo of a cactus
let photoURL = URL(string: "https://raw.githubusercontent.com/aheze/DeveloperAssets/master/cactus.png")! /// in my app it's actually a local URL,but this also works
func savetoPhotos() {
dispatchQueue.global().async {
let data = try? Data(contentsOf: self.photoURL)
let image = UIImage(data: data!)
UIImageWritetoSavedPhotosAlbum(image!,self,#selector(self.image(_:didFinishSavingWithError:contextInfo:)),nil)
}
}
/// called when the image saving is complete
@objc func image(_ image: UIImage,didFinishSavingWithError error: NSError?,contextInfo: UnsafeRawPointer) {
print("Finished saving image")
/// how to get localIdentifier of the image?
let asset = PHAsset() /// obvIoUsly this does not work...
let localIdentifier = asset.localIdentifier
}
}
图像已成功保存到“照片”应用。但是,我需要保留对它的引用,最好是它的 localIdentifier
,以便我将来可以在用户的其他照片中找到它。
例如,当我稍后调用 fetchAllPhotos
时,我需要某种方法来定位我保存的仙人掌照片。
var allPhotos: PHFetchResult<PHAsset>?
func fetchAllPhotos() {
let fetchOptions = PHFetchOptions() /// get all of user's photos
allPhotos = PHAsset.fetchAssets(with: .image,options: fetchOptions)
if let photos = allPhotos {
photos.enumerateObjects { (asset,index,stop) in
/// I need to find the image!
/// So I need to kNow its localIdentifier back when I saved it.
if asset.localIdentifier == "cactus" {
print("photo has been found")
}
}
}
}
有什么办法可以做到这一点? UIImageWritetoSavedPhotosAlbum
完成处理程序引用 UIImage
,所以也许我可以从中创建一个 PHAsset
?或者也许我可以向 UIImage
的元数据写入一些内容,我不确定。
解决方法
试试这个保存图像的逻辑:
try PHPhotoLibrary.shared().performChangesAndWait {
let imgReq = PHAssetChangeRequest.creationRequestForAsset(from: image)
self.localID = imgReq.placeholderForCreatedAsset.localIdentifier
}
您可以通过以下方式获取本地 ID:
photos.enumerateObjects { (asset,index,stop) in
if asset.localIdentifier == self.localID {
print("photo was found")
}
}
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