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

Question

1. 处理选定的图像或视频： func imagePickerController(选择器: UIImagePickerController，didFinishPickingMediaWithInfo信息: String : AnyObject) { print("ok")如果让didFinishPickingMediaWithInfo= infoUIImagePickerControllerOriginalImage as？UIImage {//如何保存该图像}否则{//如何获取视频并保存}
2. 将其保存到文档目录： 让path =尝试！例如，NSFileManager.defaultManager().URLForDirectory(NSSearchPathDirectory.DocumentDirectory，inDomain: NSSearchPathDomainMask.UserDomainMask，appropriateForURL: nil，create: false) let newPath = path.URLByAppendingPathComponent("image.jpg") /或video.mpg

如何将该图像保存到下面的newPath

Answer 1

• 使用以下步骤将图像保存到文档目录

步骤1：获取到文档目录的路径

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

步骤2：在路径中追加FileName

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

步骤3：确定图像的文件类型，无论是JPEG还是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

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。

• 使用以下功能将视频保存到文档目录 func imagePickerController(选择器: UIImagePickerController，didFinishPickingMediaWithInfo信息: NSObject : AnyObject) { // *存储UIImagePickerController * // let videoURL = infoUIImagePickerControllerMediaURL as！*从URL * // let videoData = NSData(contentsOfURL: videoURL) // *获取文档目录路径*/ let路径=NSData NSSearchPathDomainMask.UserDomainMask，// *附加视频文件名* // let dataPath = documentsDirectory.stringByAppendingPathComponent("/videoFileName.mp4") // *将视频文件数据写入路径*/ videoData?.writeToFile(dataPath，原子性: false) }

Answer 2

更新Xcode 8.3.3中Swift 3的公认答案

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)
        }
    }
}

Answer 3

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)
        }
     }