如何保存和从文件目录加载图像 - 斯威夫特4

问题描述 投票：0回答：3

我试图保存和载入图像，并从文件目录，但是我writeImageToPath函数打印以下错误控制台，并说该文件不存在。

安慰

写图像目录

文件存在写入图像

错误写入图像目录文件不存在 - 文件：///用户/用户/库/开发商/ CoreSimulator /设备/ 70EAC77D-9F3C-4AFC-8CCA-A7B9B895BDE6 /数据/集装箱/数据/应用/ DDAF2EBD-5DDA- 4EA6-95D3-6785B74A0B09 /文件/上传/ http://i.annihil.us/u/prod/marvel/i/mg/a/f0/5202887448860 - 可供使用写入图像错误写入图像：错误域= NSCocoaErrorDomain代码= 4“文件‘5202887448860’不存在”。的UserInfo = {NSFilePath = /用户/用户/资源库/开发商/ CoreSimulator /设备/ 70EAC77D-9F3C-4AFC-8CCA-A7B9B895BDE6 /数据/容器/数据/应用/ DDAF2EBD-5DDA-4EA6-95D3-6785B74A0B09 /文档/上传/ http://i.annihil.us/u/prod/marvel/i/mg/a/f0/5202887448860，NSUnderlyingError = 0x600003b04ab0 {错误域= NSPOSIXErrorDomain代码= 2 “没有这样的文件或目录”}}

这里是我的代码，我不知道我要去的地方错了

// The images are loaded from the web and displayed in the cell.imageView.image

  if let thumbnail = product["thumbnail"] as? [String: Any],
     let path = thumbnail["path"] as? String,
     let fileExtension = thumbnail["extension"] as? String {

  //Save image to directory
  if image != nil {
     writeImageToPath(path, image: image!)
  }

  }


// Write image to directory
func writeImageToPath(_ path: String, image: UIImage) {
    print("Write image to directory")

    let uploadURL = URL.createFolder(folderName: "upload")!.appendingPathComponent(path)

    if !FileManager.default.fileExists(atPath: uploadURL.path) {
        print("File does NOT exist -- \(uploadURL) -- is available for use")

        let uploadURL = URL.createFolder(folderName: "upload")!.appendingPathComponent(path)

        if let data = UIImageJPEGRepresentation(image, 0.9) {
            do {
                print("Write image")
                try data.write(to: uploadURL)
            }
            catch {
                print("Error Writing Image: \(error)")
            }

        } else {
            print("Image is nil")
        }
    } else {
        print("This file exists -- something is already placed at this location")
    }

}


// load image from directory
func loadImageFromPath(_ path: String) -> UIImage? {

    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]

    let folderURL = documentsURL.appendingPathComponent("upload")

    let fileURL = folderURL.appendingPathComponent(path)

    if FileManager.default.fileExists(atPath: fileURL.path) {
        //Get Image And upload in server
        print("fileURL.path \(fileURL.path)")

        do{
            let data = try Data.init(contentsOf: fileURL)
            let image = UIImage(data: data)
            return image
        }catch{
            print("error getting image")
        }
    } else {
        print("No image in directory")
    }

    return nil
}


extension URL {
static func createFolder(folderName: String) -> URL? {
    let fileManager = FileManager.default
    // Get document directory for device, this should succeed
    if let documentDirectory = fileManager.urls(for: .documentDirectory,
                                                in: .userDomainMask).first {
        // Construct a URL with desired folder name
        let folderURL = documentDirectory.appendingPathComponent(folderName)
        // If folder URL does not exist, create it
        if !fileManager.fileExists(atPath: folderURL.path) {
            do {
                // Attempt to create folder
                try fileManager.createDirectory(atPath: folderURL.path,
                                                withIntermediateDirectories: true,
                                                attributes: nil)
            } catch {
                // Creation failed. Print error & return nil
                print(error.localizedDescription)
                return nil
            }
        }
        // Folder either exists, or was created. Return URL
        return folderURL
    }
    // Will only be called if document directory not found
    return nil
}
}

我怎样才能正确保存并从目录中加载图像？

ios swift nsfilemanager
3个回答
1
投票
class MyImageClass {
    func writeImageToPath(_ path:String, image:UIImage) {
        let uploadURL = URL.createFolder(folderName: "upload")!.appendingPathComponent(path)

        if !FileManager.default.fileExists(atPath: uploadURL.path) {
            print("File does NOT exist -- \(uploadURL) -- is available for use")
            let data = image.jpegData(compressionQuality: 0.9)
            do {
                print("Write image")
                try data!.write(to: uploadURL)
            }
            catch {
                print("Error Writing Image: \(error)")
            }
        }
        else {
            print("This file exists -- something is already placed at this location")
        }
    }
}

extension URL {
    static func createFolder(folderName: String) -> URL? {
        let fileManager = FileManager.default
        // Get document directory for device, this should succeed
        if let documentDirectory = fileManager.urls(for: .documentDirectory,
                                                in: .userDomainMask).first {
            // Construct a URL with desired folder name
            let folderURL = documentDirectory.appendingPathComponent(folderName)
            // If folder URL does not exist, create it
            if !fileManager.fileExists(atPath: folderURL.path) {
                do {
                    // Attempt to create folder
                    try fileManager.createDirectory(atPath: folderURL.path,
                                                withIntermediateDirectories: true,
                                                attributes: nil)
                } catch {
                    // Creation failed. Print error & return nil
                    print(error.localizedDescription)
                    return nil
                }
            }  
            // Folder either exists, or was created. Return URL
            return folderURL
        }
        // Will only be called if document directory not found
        return nil
    }
}

var saving = MyImageClass()
saving.writeImageToPath("whereIWantToSaveTheImageTo", image: UIImage(named: "myImage"))

参考Create Directory in Swift 3.0

如果成像的工作，但是，这并创建一个名为“上传”文件夹，每次都可以把它叫做我没有测试。扩展有一个名为createFolder方法，它返回无论你怎么称呼一个文件夹，并创建它，如果它已不存在。我们只要检查该文件夹中指定的路径，那么如果它是可用的，我们可以写它。我也只是改写了writeImageToPath部分。

注意：

在操场上测试了这个...

结果如下：

File does NOT exist -- file:///var/folders/vs/nlj__xh93vs0f8wzcgksh_zh0000gn/T/com.apple.dt.Xcode.pg/containers/com.apple.dt.playground.stub.iOS_Simulator.MyPlayground-67A67A07-51FF-4DF4-BE80-02E7FDAFA1CA/Documents/upload/whereIWantToSaveTheImageTo -- is available for use
Write image
0
投票

下面是我如何图像保存到一个名为“屏幕截图”文件夹中。我试图保持它明确的，因为我可以。

func saveImageToDocumentDirectory(image: UIImage) {
    var objCBool: ObjCBool = true
    let mainPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0];
    let folderPath = mainPath + "/Screenshots/"

    let isExist = FileManager.default.fileExists(atPath: folderPath, isDirectory: &objCBool)
    if !isExist {
        do {
            try FileManager.default.createDirectory(atPath: folderPath, withIntermediateDirectories: true, attributes: nil)
        } catch {
            print(error)
        }
    }

    let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let imageName = "\(fileName).png"
    let imageUrl = documentDirectory.appendingPathComponent("Screenshots/\(imageName)")
    if let data = image.jpegData(compressionQuality: 1.0){
        do {
            try data.write(to: imageUrl)
        } catch {
            print("error saving", error)
        }
    }
}

这是我的加载文件夹中存储的图像

 func loadImageFromDocumentDirectory(nameOfImage : String) -> UIImage {
    let nsDocumentDirectory = FileManager.SearchPathDirectory.documentDirectory
    let nsUserDomainMask = FileManager.SearchPathDomainMask.userDomainMask
    let paths = NSSearchPathForDirectoriesInDomains(nsDocumentDirectory, nsUserDomainMask, true)
    if let dirPath = paths.first{
        let imageURL = URL(fileURLWithPath: dirPath).appendingPathComponent("Screenshots/\(nameOfImage)")
        guard let image = UIImage(contentsOfFile: imageURL.path) else { return  UIImage.init(named: "fulcrumPlaceholder")!}
        return image
    }
    return UIImage.init(named: "imageDefaultPlaceholder")!
}
0
投票

路径名是错的正确的路径名来代替这个函数调用

writeImageToPath("http://i.annihil.us/u/prod/marvel/i/mg/b/70/4c0035adc7d3a", image: image)

至

writeImageToPath("4c0035adc7d3a", image: image)
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