Swift 3：无法从Parse中获取图像？

Question

好吧，我看着像How do you access an object's fields from a Parse query result in Swift?的问题，但答案是没有斯威夫特3.工作与下列试图从解析第一PFObject得到的图像我得到的错误：

Cannot convert value type NSData, NSError -> Void to expected PFDataResultBlock ?

var query = PFQuery(className: PARSE_CLASS!) 
      query.order(byDescending: "createdAt") 
      query.findObjectsInBackground { 
       (objects, error) -> Void in 

      if error == nil { 
       //print(objects?.first?["testTxt"] as! NSString) 
       //print(objects?.first?["testImg"] as! PFFile) 

       let thumbnail = objects?.first?["testImg"] as! PFFile 
       thumbnail.getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in 
        if error == nil { 
         if let image = UIImage(data: imageData!) { 
//get image here 

         } 
        } 
      } 
     } 

我试图改变类型和一切。我如何在最近的Swift中存储来自Parse的图像？

Answer 1

你可以试试这个：

if let validObjects = objects { 
    for object in validObjects { 
     let thumbnail = object["testImg"] as? PFFile 
     thumbnail?.getDataInBackground (block: { (data, error) -> Void in 
     //read image here 
     } 
    } 
}