如何将 UIPickerViewController 中的图像或视频保存到文档目录？答案

【问题标题】：How to save image or video from UIPickerViewController to document directory?如何将 UIPickerViewController 中的图像或视频保存到文档目录？
【发布时间】：2015-11-25 12:33:26
【问题描述】：

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
    }
}

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关注newPath？

【问题讨论】：

标签： ios swift nsfilemanager

【解决方案1】：

第一步：获取文档目录的路径

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

第 2 步：在路径中附加文件名

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

第 3 步：确定图像的文件类型为 JPEG 或 PNG，并将图像转换为数据（字节）

//let pngImageData = UIImagePNGRepresentation(image) // if you want to save as PNG
let jpgImageData = UIImageJPEGRepresentation(image, 1.0)   // if you want to save as JPEG

第 4 步：将文件写入创建的路径

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

将以上代码添加到您的didFinishPickingImage 函数中。

使用以下函数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)
}

【讨论】：

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。
是的@BartłomiejSemańczyk 可以，我会更新我的答案。但是您需要使用视频选择器及其代表。相同的委托方法将不起作用。
最后一件事，我们怎么知道那个视频是什么扩展名？我们可以将它与mediaInfo 区别开来吗？
只有在 iOS 设备中存储时才会是 .mp4 视频，但您可以从 mediaInfo 字典中的 UIImagePickerControllerMediaURL 中找到它。

【解决方案2】：

在 Xcode 8.3.3 中更新已接受的 Swift 3 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)
        }
    }
}

【讨论】：

【解决方案3】：

斯威夫特 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)
        }
     }

【讨论】：