如何从照片库中获取图像？

Posted 2023-02-23

【中文标题】如何从照片库中获取图像？

【英文标题】：How do I fetch images from photo library?

【发布时间】：2016-09-27 14:39:29

【问题描述】：

您好，我已经从 swift 2 切换到 swift 3。

这是我的uploadVC

class PhotoUploadVC: UICollectionViewController 


    fileprivate var assets: PHFetchResult<AnyObject>?
    fileprivate var sideSize: CGFloat!

//是viewDidLoad()的sn-p

override func viewDidLoad() 
        super.viewDidLoad()


        //Navigation Config
        self.navigationItem.title = "CAMERA ROLL"




        if phphotoLibrary.authorizationStatus() == .authorized 
            reloadAssets()
         else 
            PHPhotoLibrary.requestAuthorization( (status: PHAuthorizationStatus) -> Void in
                if status == .authorized 
                    self.reloadAssets()
                 else 
                    self.showNeedAccessMessage()
                
            )
        



    

//这里是获取图片的函数

fileprivate func showNeedAccessMessage() 
        let alert = UIAlertController(title: "Image picker", message: "App need get access to photos", preferredStyle: .alert)

        alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler:  (action: UIAlertAction) -> Void in
            self.dismiss(animated: true, completion: nil)
        ))

        alert.addAction(UIAlertAction(title: "OK", style: .default, handler:  (action: UIAlertAction) -> Void in
            UIApplication.shared.openURL(URL(string: UIApplicationOpenSettingsURLString)!)
        ))

        self.show(alert, sender: nil)
    

    fileprivate func reloadAssets() 
//        activityIndicator.startAnimating()
        assets = nil

        collectionView?.reloadData()
        let fetchOptions = PHFetchOptions()
        fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
        assets = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: fetchOptions)



        collectionView?.reloadData()


//        activityIndicator.stopAnimating()
    

我在上面收到一条错误消息。

问题出在哪里？

我认为“fileprivate var assets：PHFetchResult？”

有人帮我吗？

【参考方案1】：

尝试改变：

fileprivate var assets: PHFetchResult<AnyObject>?

进入

var assets: [AnyObject]!