使用PHPickerViewController将照片传递到收藏夹视图

问题描述

我正在尝试使用PHPickerViewController从选择器中获取照片并将其添加到收藏夹视图中。由于PHPickerViewController太新了，因此我发现的信息非常有限。我以为我必须将其转换为PHAsset，但是这样做没有运气。下面的代码将正确运行，但是集合视图显示为空白。我知道我缺少一些在选择器委托中处理结果的代码，这是因为我尝试的每个解决方案都失败了。我想我还需要处理cellForItem委托中的fetchResult，但是我也失败了。关于我做错了什么或在哪里可以找到解决方案的任何想法？

收藏夹视图

class DetailViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout,UINavigationControllerDelegate,PHPickerViewControllerDelegate {
    
    var editCollectionView: UICollectionView!
    var photosInTheCellNow = [UIImage]()
    let configuration = PHPickerConfiguration()
    var imageView: UIImageView!
    let imgManager = PHImageManager.default()
    let requestOptions = PHImageRequestOptions()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.white
        
        var config = PHPickerConfiguration()
        config.selectionLimit = 10
        config.filter = PHPickerFilter.images
        let picker = PHPickerViewController(configuration: config)
        picker.delegate = self
        present(picker,animated: true)
        let layout = UICollectionViewFlowLayout()
        
        editCollectionView = UICollectionView(frame: self.view.frame,collectionViewLayout: layout)
        editCollectionView.delegate = self
        editCollectionView.dataSource = self
        editCollectionView.backgroundColor = UIColor.white
        editCollectionView.allowsMultipleSelection = true
        editCollectionView.register(ImageEditCell.self,forCellWithReuseIdentifier: "editCell")
        
        self.view.addSubview(editCollectionView)
        
        editCollectionView.autoresizingMask = UIView.AutoresizingMask(rawValue: UIView.AutoresizingMask.RawValue(UInt8(UIView.AutoresizingMask.flexibleWidth.rawValue) | UInt8(UIView.AutoresizingMask.flexibleHeight.rawValue)))

    }
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        editCollectionView.collectionViewLayout.invalidateLayout()
    }
    
    func picker(_ picker: PHPickerViewController,didFinishPicking results: [PHPickerResult]) {
        dismiss(animated: true)
     
        let identifiers = results.compactMap(\.assetIdentifier)
        let fetchResult = PHAsset.fetchAssets(withLocalIdentifiers: identifiers,options: nil)
        print("Identifiers: \(identifiers)")
        print("FetchResults: \(fetchResult)")

    }
    func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
        return photosInTheCellNow.count
    }
    func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "editCell",for: indexPath) as! ImageEditCell
        cell.imgView.image =  photosInTheCellNow[indexPath.item]
        return cell
    }
    func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeforItemAt indexPath: IndexPath) -> CGSize {
        let width = collectionView.frame.width
        return CGSize(width: width/4 - 1,height: width/4 - 1)
    }
    func collectionView(_ collectionView: UICollectionView,minimumLinespacingForSectionAt section: Int) -> CGFloat {
        return 1.0
    }
    func collectionView(_ collectionView: UICollectionView,minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 1.0
    }
}

馆藏视图单元格

class ImageEditCell: UICollectionViewCell {    
    var imgView: UIImageView = {
        var img = UIImageView()
        img.contentMode = .scaleAspectFit        
        return img
    }()
    override func awakeFromNib() {
            super.awakeFromNib()
        }
        override func prepareForReuse() {
            super.prepareForReuse()
        }
}

解决方法

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