如何從UIImagePickerController檢索PHAsset

Question

我試圖檢索一個PHAsset但PHAsset.fetchAssets（與ALAssetURLs：選項:)已從iOS 8棄用，所以如何正確檢索PHAsset？

Answer 1

我不確定你想要什麼。

你想要瞄準iOS 8嗎？

這是我如何獲取照片，它適用於iOS（8.0和更高版本），macOS（10.11和更高版本），tvOS（10.0和更高版本）。 代碼被註釋掉它可能會產生混淆

1. 第一個功能設置的選項，以獲取照片

2. 第二個函數實際上將獲取它們

   //import the Photos framework 
   import Photos 
   //in these arrays I store my images and assets 
   var images = [UIImage]() 
   var assets = [PHAsset]() 
   
   fileprivate func setPhotoOptions() -> PHFetchOptions{ 
        let fetchOptions = PHFetchOptions() 
        fetchOptions.fetchLimit = 15 
        let sortDescriptor = NSSortDescriptor(key: "creationDate", ascending: false) 
        fetchOptions.sortDescriptors = [sortDescriptor] 
        return fetchOptions 
       } 
   
   
   
   
   fileprivate func fetchPhotos() { 
   let allPhotos = PHAsset.fetchAssets(with: .image, options: setPhotoOptions()) 
   
   DispatchQueue.global(qos: .background).async { 
   
       allPhotos.enumerateObjects({ (asset, count, stop) in 
        let imageManager = PHImageManager.default() 
        let targetSize = CGSize(width: 200, height: 200) 
        let options = PHImageRequestOptions() 
        options.isSynchronous = true 
        imageManager.requestImage(for: asset, targetSize: targetSize, contentMode: .aspectFit, options: options, resultHandler: { (image, info) in 
   
         if let image = image { 
          self.images.append(image) 
          self.assets.append(asset) 
   
   
         } 
   
         if count == allPhotos.count - 1 { 
          DispatchQueue.main.async { 
           //basically, here you can do what you want 
           //(after you finish retrieving your assets) 
           //I am reloading my collection view 
           self.collectionView?.reloadData() 
          } 
         } 
   
        }) 
   
   
       }) 
   
   } 
   

   }

根據OP的澄清編輯

您需要設置委託UIImagePickerControllerDelegate

然後實現以下功能

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

中所述方法，得到這樣的形象：

var image : UIImage = info[UIImagePickerControllerEditedImage] as! UIImage 

Answer 2

我有同樣的問題，首先檢查權限並請求訪問：

let status = PHPhotoLibrary.authorizationStatus() 

if status == .notDetermined { 
    PHPhotoLibrary.requestAuthorization({status in 

    }) 
} 

只需掛鉤即可觸發您的UIImagePickerController。委託調用現在應該在userInfo中包含PHAsset。

guard let asset = info[UIImagePickerControllerPHAsset] as? PHAsset