NSFileManager 无法保存 - 没有这样的文件或目录

Question

我正在使用“AlamoFireImage”下载我的图像文件。

然后，我使用NSFileManager 和CreateFile 方法将它们保存在一个目录中。

但是当我尝试检索保存的图像时，它只返回第一个文件。虽然它应该保存了 15 张图片。

这是我保存图像文件的功能：

func getImage(url: String) {
    Alamofire.request("https://www.tandori.ir/uploads/categories/" + url).responseImage { (response) in
        if response.result.value != nil {
            do {
                let fileManager = FileManager.default
                let paths = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent(url)
                let image = UIImage(named: url)
                let imageData = image?.jpegData(compressionQuality: 0.2)
                fileManager.createFile(atPath: paths as String, contents: imageData, attributes: nil)
                print(paths)
            }
            catch let error as NSError {
                print(error)
            }
        }

    }
}

这是我下载它们的功能：

func launchApp() {
    let imgTitiles = UserDefaults.standard.array(forKey: "imgsArray")!
    for pic in imgTitiles {
        self.getImage(url: pic as! String)
        print("done")
    }
    let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
    let resultViewController = storyBoard.instantiateViewController(withIdentifier: "mainTab") as! TandoriTabView
    self.present(resultViewController, animated: true)
}

当我尝试检索保存的图像时，我在控制台上收到此错误：

“BOMStream BOMStreamWithFileAndSys(int, off_t, size_t, int, char *, BomSys *): 读取：没有这样的文件或目录”

我正在尝试在集合视图中显示这些图像。

这是我的 ViewController 中的代码：

//Get Images Directory Path Function.
func getDirectoryPath() -> String {
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
    let documentsDirectory = paths[0]
    return documentsDirectory
}


//Get Images Function.
func getImage(name : String) -> String {
    _ = FileManager.default
    let imagePAth = (self.getDirectoryPath() as NSString).appendingPathComponent(name)

    return imagePAth

}

 //Show Images in collectionView cells function.
 func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = categoriesCollection.dequeueReusableCell(withReuseIdentifier: "categories", for: indexPath) as! categoriesCell
    let imageAddress = getImage(name: imgTitiles[indexPath.row] as! String) //TheRealShit
    cell.categoryImage.image = UIImage(contentsOfFile: imageAddress)
    return cell
}

似乎是什么问题？

提前致谢！

Answer 1

实际上您使用 Alamofire 下载图像是异步的。因此，当您显示视图控制器时，您只有很少的图像。在下面的代码中将您的代码同步修改为 getImage()。我希望它对你有用。

func getImage(url: String) {
   if let image = UIImage(named: url) {
   let fileManager = FileManager.default
   let paths = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent(url)
   let imageData = image?.jpegData(compressionQuality: 0.2)
            fileManager.createFile(atPath: paths as String, contents: imageData, attributes: nil)
            print(paths)
 }
}