火力地堡存储。下载图像数组

Question

我正在尝试从 Firebase 存储文件夹下载一些图像并将其放入我的模型中 Rules Firebase Folder Images in folder

我的模型来了。而不是字符串 (1,2,3,4,5) 我必须使用具有相同字符串名称的文件夹中的图像

struct ImageModel {
    var images: String
    var index: Int
    var imageLabel: String
    var description: String
    var comment = [String]()
}

class Model {
   static var imageModel = [
        ImageModel(images: "1", index: 0, imageLabel: "MDA", description: "description", comment: []),
        ImageModel(images: "2", index: 1, imageLabel: "Picture!", description: "some description.", comment: []),
        ImageModel(images: "3", index: 2, imageLabel: "What is this??", description: "description", comment: []),
        ImageModel(images: "4", index: 3, imageLabel: "A long named picture", description: "description", comment: []),
    ]
}

我找到了如何写请求

func uploadMedia() {
        let storageRef = Storage.storage().reference().child("pictures")
        let megaByte = Int64(1 * 1024 * 1024)
        
        storageRef.getData(maxSize: megaByte) { (data, error) in
            guard let data = data else { return }
            let image = UIImage(data: data)
            for i in Model.imageModel {
                i.images = image
            }
        }
    }

但是它有一些错误，比如

Cannot assign to property: i is a let constant ... and .... Cannot assign value of type UIImage? to type String

如何更改我的型号或要求？

我在 CollectionViewCell 中使用我的模型。所以我里面有 collectionView 和 Cell。单元格有图像和名称。这张图片我必须从 Firebase Storage 和我的模型中已有的名称中获取。原因是使用存储，我的图像有时会发生变化

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        guard let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: CollectionViewCell.identifier, for: indexPath) as? CollectionViewCell else { return UICollectionViewCell() }
        cell.configureCollectionViewCell(picture: UIImage(named: String(Model.imageModel[indexPath.row].images))!, imageLabel: Model.imageModel[indexPath.row].imageLabel)
        return cell
    }

UPD:

我将模型更改为：

struct ImageModel {
    var images: UIImage
    var index: Int
    var imageLabel: String
    var description: String
    var comment = [String]()
}

class Model {
   static var imageModel = [
    ImageModel(images: UIImage(), index: 0, imageLabel: "MDA", description: "description", comment: []),
    ImageModel(images: UIImage(), index: 1, imageLabel: "Picture!", description: "some description.", comment: []),
    ImageModel(images: UIImage(), index: 2, imageLabel: "What is this??", description: "description", comment: []),
    ImageModel(images: UIImage(), index: 3, imageLabel: "A long named picture", description: "description", comment: []),
    ]
}

然后我将方法放入 ViewWillAppear 并尝试得到错误或结果

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.uploadMedia()
    }
    
    func uploadMedia() {
        let storageRef = Storage.storage().reference().child("pictures")
        let megaByte = Int64(1 * 1024 * 1024)
        
        storageRef.getData(maxSize: megaByte) { (data, error) in
            guard let data = data else { return }
            let image = UIImage(data: data)
            for (index, i) in Model.imageModel.enumerated() {
                Model.imageModel[index].images = image!
            }
            guard let error = error else  { return }
            print(error.localizedDescription)
        }
    }

并且没有任何反应，日志为空

2022-05-29 20:20:09.668785+0700 diplom[14378:13214993] [boringssl] boringssl_metrics_log_metric_block_invoke(153) Failed to log metrics

我还有方法可以帮助我将模型保存到另一个模型。这就是为什么我想在我的模型中使用 String

这里..CollectionView准备Detail VC

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let vc = DetailVC()
        vc.picture = UIImageView(image: Model.imageModel[indexPath.row].images)
        vc.imageLbel.text = Model.imageModel[indexPath.row].imageLabel
        vc.pictureNamed = Model.imageModel[indexPath.row].images
        vc.index = Model.imageModel[indexPath.row].index
        vc.descripLabel.text = Model.imageModel[indexPath.row].description
        self.navigationController?.pushViewController(vc, animated: true)
    }

Detail VC 属性

 var pictureNamed = String()

已保存收集单元的模型

struct savedCategory: Codable {
    var images: String
    var index: Int
    var imageLabel: String
    var description: String
    var comment = [String]()
}


class SavedCategoryModel {
    static var categoryModel: [savedCategory] = []
}

UserDefaults 我之前使用可编码模型

class UserDefaultsConfig {
    func saveData() {
        let defaults = UserDefaults.standard
        defaults.set(try? PropertyListEncoder().encode(SavedCategoryModel.categoryModel), forKey:"SavedStringArray")
    }
    func showList() {
        let defaults = UserDefaults.standard
        if let data = defaults.value(forKey:"SavedStringArray") as? Data { SavedCategoryModel.categoryModel = try! PropertyListDecoder().decode(Array<savedCategory>.self, from: data) }
    }
}

这是我的方法。所以有很多变化...是否有任何分辨率可以获取图像字符串？

@objc func savePicture() {
        let newArray = savedCategory(images: self.pictureNamed, index: index, imageLabel: self.imageLbel.text!, description: self.descripLabel.text ?? "empty", comment: Model.imageModel[index].comment)
        SavedCategoryModel.categoryModel.append(newArray)
        self.userDefaults.saveData()
        self.userDefaults.showList()
    }

Answer 1

您想直接访问图像数组，而不是对每个项目的引用。

for (index, i) in Model.imageModel.enumerated() {
    Model.imageModel[index].images = image
}

此外，您的 images 属性接受一个字符串，定义如下：

var images: String

但您正试图为其分配 UIImage。我不确定您要添加到 ImageModel 中的内容，也许您可以详细说明一下？

对更新问题的回复：

首先，让您的结构接受 images 作为 UIImage:

struct ImageModel {
    var images: UIImage // <-- from String to UIImage
    var index: Int
    var imageLabel: String
    var description: String
    var comment = [String]()
}

然后，更改此行：

cell.configureCollectionViewCell(picture: UIImage(named: String(Model.imageModel[indexPath.row].images))!, imageLabel: Model.imageModel[indexPath.row].imageLabel)

收件人：

cell.configureCollectionViewCell(picture: Model.imageModel[indexPath.row].images, imageLabel: Model.imageModel[indexPath.row].imageLabel)

最后一个建议，您似乎只在 ImageModel.images 中存储了 1 张图像，因此可以将变量名称更改为单数 image，如下所示：

struct ImageModel {
    var image: UIImage // <-- from String to UIImage
    var index: Int
    var imageLabel: String
    var description: String
    var comment = [String]()
}

让我知道这是有道理的

火力地堡存储。下载图像数组

Firebase storage. Download array of images

firebase

swift

firebase-storage