如何確定PFFile是視頻還是圖像？

Question

我正在用Parse創建IO的應用程序，並且 想知道如何確定我得到的文件是視頻還是圖像任何想法？任何建議？

Answer 1

這裏就是我有這麼遠

 if let value = allPost[indexPath.row]["imageFile"] as? PFFile { 

     let PFFileURLFromParse = value.url 

     let fileUrl = NSURL(string: PFFileURLFromParse!) 

     func thumbnailImagePreview() -> UIImage? 

     { 

      let asset = AVURLAsset(URL: fileUrl!) 

      let imageGenerator = AVAssetImageGenerator(asset: asset) 

      imageGenerator.appliesPreferredTrackTransform = true 

      imageGenerator.apertureMode = AVAssetImageGeneratorApertureModeEncodedPixels 

      do { 

       let time: CMTime = CMTime(seconds: 0.0, preferredTimescale:1) 

       let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil) 

       return UIImage(CGImage: imageRef) 

      } catch { 

       return nil 

      } 

     } 

     if (fileUrl!.pathExtension!.lowercaseString == "mov"){ 

      print("Parse image is a mov: \(fileUrl!.pathExtension!.lowercaseString)」); 

fileExtenion = "mov"; 

cell.ImagePost.image = thumbnailImagePreview() 

      cell.ImagePost.loadInBackground() 

      print("fileExtenion is \(fileExtenion)") 

     } 

     else{ 

      fileExtenion = ".png"; 

      print("DEFAULTING TO file type, Parse image is a png: \(fileUrl!.pathExtension!.lowercaseString)"); 

     } 

     cell.ImagePost.file = value 

     cell.ImagePost.loadInBackground() 

    } 

//但是對於電池負載越來越太長，我如何把它的CollectionView（的CollectionView：UICollectionView，cellForItemAtIndexPath indexPath：NSIndexPath） - > UICollectionViewCell {}