如何从Swift中的文档文件夹中检索保存的UIImageView？

我正在创建这个应用程序，它可以拍摄照片并在UIImageView中显示。当我按下保存按钮时，它会将图像保存到文档目录中。然后我希望能够在我的收藏视图中检索这些图像。我有下面保存图像的代码，但如何在我的收藏视图中检索它？谢谢

第一视图控制器-保存图像

func saveImage(image: UIImage) -> String {

let imageData = NSData(data: image.pngData()!)
let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory,  FileManager.SearchPathDomainMask.userDomainMask, true)
 let docs = paths[0] as NSString
 let uuid = NSUUID().uuidString + ".png"
 let fullPath = docs.appendingPathComponent(uuid)
 _ = imageData.write(toFile: fullPath, atomically: true)
return uuid
 }



@IBAction func didPressSaveButton(_ sender: Any) {
                      

 for _ in self.images {
   _ = self.saveImage(image: self.imageView.image!)
      }

}

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "customCell", for: indexPath) as!
    MyPicturesCollectionViewCell
           
    

    return cell
}

第二视图控制器-检索图像

func saveImage(image: UIImage) -> String {

let imageData = NSData(data: image.pngData()!)
let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory,  FileManager.SearchPathDomainMask.userDomainMask, true)
 let docs = paths[0] as NSString
 let uuid = NSUUID().uuidString + ".png"
 let fullPath = docs.appendingPathComponent(uuid)
 _ = imageData.write(toFile: fullPath, atomically: true)
return uuid
 }



@IBAction func didPressSaveButton(_ sender: Any) {
                      

 for _ in self.images {
   _ = self.saveImage(image: self.imageView.image!)
      }

}

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "customCell", for: indexPath) as!
    MyPicturesCollectionViewCell
           
    

    return cell
}

---

你可以这样取回它

func loadImageFromDocumentDirectory(nameOfImage : String) -> UIImage? {

    let documentDirectory = FileManager.SearchPathDirectory.documentDirectory
    let userDomainMask = FileManager.SearchPathDomainMask.userDomainMask
    let paths = NSSearchPathForDirectoriesInDomains(documentDirectory, userDomainMask, true)
    if let dirPath = paths.first{
        let imageURL = URL(fileURLWithPath: dirPath).appendingPathComponent(nameOfImage)
        if let image = UIImage(contentsOfFile: imageURL.path) {
            return image

        } else {
            print("image not found")

            return nil
        }
    }
    return nil
}

为了节省

func saveImageToDocumentDirectory(image: UIImage , imageName: String) {
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let fileName = imageName // name of the image to be saved
    let fileURL = documentsDirectory.appendingPathComponent(fileName)
    if let data = image.jpegData(compressionQuality: 1),
        !FileManager.default.fileExists(atPath: fileURL.path){
        do {
            try data.write(to: fileURL)
            print("file saved")
        } catch {
            print("error saving file:", error)
        }
    }
}

---

我在这行

self.saveImageToDocumentDirectory（image:self.imageView.image！，imageName:“images”）

上收到一个错误，它说在展开可选值时意外地发现了零。不要强制展开

self.imageView.image

使用

if let

调用它来检查您的imageview是否有图像…比如

if let image=self.imageview.image{self.saveImageToDocumentDirectory（image:image，imageName:images”）}或者{print（“image not found”）}

谢谢，但是由于某种原因它没有保存在文档目录中。保存和检索图像时，它会打印出未找到的

图像

。