ios - 如何将 UIPickerView Controller 中的图像或视频保存到文档目录？

Question

1. 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
       }
   }
   

2. 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？

Answer 1

• 使用以下步骤将图像保存到文档目录

第 1 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

第四步: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)
  }