Ios 如何将图像或视频从UIPickerViewController保存到文档目录？

处理选定的图像或视频：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    print("ok")

    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        //what to do to save that image
    } else {
        //how to get the video and save
    }
}

将其保存到文档目录：

let path = try! NSFileManager.defaultManager().URLForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomain: NSSearchPathDomainMask.UserDomainMask, appropriateForURL: nil, create: false)
let newPath = path.URLByAppendingPathComponent("image.jpg") //or video.mpg for example

如何将该图像保存到以下

newPath

？

• 使用以下步骤将图像保存到文档目录

步骤1：获取文档目录的路径

let path = try! NSFileManager.defaultManager().URLForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomain: NSSearchPathDomainMask.UserDomainMask, appropriateForURL: nil, create: false)

步骤2：在路径中追加文件名

let newPath = path.stringByAppendingPathComponent("image.jpg")

步骤3：确定图像的文件类型为JPEG或PNG，并将图像转换为数据（字节）

步骤4：将文件写入创建的路径

let result = jpgImageData!.writeToFile(newPath, atomically: true)

将上述代码添加到

didFinishPickingImage

函数中

• 使用以下func将视频保存到文档目录

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) 
  {
      // *** store the video URL returned by UIImagePickerController *** //
      let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
  
      // *** load video data from URL *** //
      let videoData = NSData(contentsOfURL: videoURL)
  
      // *** Get documents directory path *** //
      let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0]
  
      // *** Append video file name *** //
      let dataPath = documentsDirectory.stringByAppendingPathComponent("/videoFileName.mp4")
  
      // *** Write video file data to path *** //
      videoData?.writeToFile(dataPath, atomically: false)
  }
  

---

在Xcode 8.3.3中更新Swift 3的接受答案

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        let path = try! FileManager.default.url(for: FileManager.SearchPathDirectory.documentDirectory, in: FileManager.SearchPathDomainMask.userDomainMask, appropriateFor: nil, create: false)
        let newPath = path.appendingPathComponent("image.jpg")
        let jpgImageData = UIImageJPEGRepresentation(image, 1.0)
        do {
            try jpgImageData!.write(to: newPath)
        } catch {
            print(error)
        }

    } else {
        let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
        let videoData = NSData(contentsOf: videoURL as URL)
        let path = try! FileManager.default.url(for: FileManager.SearchPathDirectory.documentDirectory, in: FileManager.SearchPathDomainMask.userDomainMask, appropriateFor: nil, create: false)
        let newPath = path.appendingPathComponent("/videoFileName.mp4")
        do {
            try videoData?.write(to: newPath)
        } catch {
            print(error)
        }
    }
}

---

Swift 5

func getDocumentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    }

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        picker.dismiss(animated: true)
        guard let image = info[.editedImage] as? UIImage else {
            print("No image found")
            return
        }
        // saving to application directory
        let imageName = UUID().uuidString
        let imagePath = getDocumentsDirectory().appendingPathComponent(imageName)
        if let jpegData = image.jpegData(compressionQuality: 0.8) {
            print("Image Save to path \(imagePath)")
            try? jpegData.write(to: imagePath)
        }
     }

---

我可以为视频做类似的事情吗？请用视频示例更新您的答案。是@Bartłomiejsemanńczyk，如果可以，我将更新我的答案。但是，同样需要使用视频选择器及其委托。同样的委托方法将不起作用。最后一件事，我们如何知道视频的扩展名是什么？我们可以区别于从

mediaInfo

中播放它吗？只有当它存储在iOS设备中时，它才会是

.mp4

视频，尽管您可以从

mediaInfo

字典中的UIImagePickerControllerMediaURL中找到它。

func getDocumentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    }

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        picker.dismiss(animated: true)
        guard let image = info[.editedImage] as? UIImage else {
            print("No image found")
            return
        }
        // saving to application directory
        let imageName = UUID().uuidString
        let imagePath = getDocumentsDirectory().appendingPathComponent(imageName)
        if let jpegData = image.jpegData(compressionQuality: 0.8) {
            print("Image Save to path \(imagePath)")
            try? jpegData.write(to: imagePath)
        }
     }