模糊引用成员'jsonObject（与：选项:)

Question

我试图从服务器加载图像到我的ios应用程序与GET请求的帮助。然而它显示出一些含糊不清。任何人都可以请帮忙。这里是低于code`
进口的UIKit

类的ViewController：UIViewController中，UICollectionViewDelegate，UICollectionViewDataSource { @IBOutlet VAR MyCollectionView：UICollectionView！

var images : [String] = [] 

override func viewDidLoad() { 
    super.viewDidLoad() 

    loadImages() 

} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
    return images.count 
} 

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
    //MyCollectionViewCell 

    let myCell:MyCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "myCell", for: indexPath) as! MyCollectionViewCell 



    DispatchQueue.global(qos: .background).async{ 

     let imageString = self.images[indexPath.row] 
     let imageUrl = NSURL(string: imageString) 
     let imageData = NSData(contentsOf: imageUrl! as URL) 

     DispatchQueue.main.async { 
      //if(imageData! = nil) 
      //{ 

       myCell.myImageView.image = UIImage(data: imageData! as Data) 

      //}//end of if 
     }//end of DispatchQueue.main.async 




    };//end of main dispatch 

    return myCell 
} 

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 
    print("User tapped on image # \(indexPath.row)") 
} 

func loadImages() 
{ 
     let startTime = NSDate.timeIntervalSinceReferenceDate 

     var pageUrl = "Url is here" 
    let myUrl = NSURL(string: pageUrl) 
    let request = NSMutableURLRequest(url:myUrl! as URL) 

    let task = URLSession.shared.dataTask(with: request as URLRequest){ 
      data, response, error in 

     //If error displays any alert message 
     if error != nil { 

      var myAlert = UIAlertController(title: "Alert", message: error?.localizedDescription, preferredStyle: UIAlertControllerStyle.alert) 

      let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil) 

      myAlert.addAction(okAction) 

      self.present(myAlert, animated: true, completion: nil) 

      return 


     } 

     var err: NSError? 

     if let usabledata = data{ 
     do{ 
     var jsonArray = try JSONSerialization.jsonObject(with: usabledata, options: .mutableContainers) as! [String:AnyObject] 
      print(jsonArray) 

     //conditional binding error here 
     if let parseJSONArray = jsonArray { 

      self.images = parseJSONArray as! [String] 

      DispatchQueue.main.async(execute: { 
       self.MyCollectionView.reloadData() 

      })//end of dispatchQueue 


     }//end of if 
     }catch{ 
      print(error) 

     } 


    } 
    } 

    task.resume() 

} 

}

Answer 1

试试这个：

替换代码

if let usableData = data { 
     do { 

     var jsonArray = try JSONSerialization.jsonObject(with: usableData, options: .mutableContainers) as! [String:AnyObject] 
      if let parseJSONArray = jsonArray as? [String] { 
      // parse array here 
      } 

     print(jsonArray) 
     } catch { 
       print("JSON Processing Failed") 
       } 
      }