JSON圖像和Swift 3中的核心數據

Question

如何在Core Data，Swift 3中保存JSON圖像？我有a url - 這是一個GET請求。我想要保存profimg和UID。

如何在Swift 3中保存並獲取它們？

Answer 1

從iOS 11和Xcode 9開始，Core Data支持URI數據類型，該類型適合存儲來自JSON的profimg字段的圖像URL。你也可以使用核心數據的字符串類型，爲了方便起見，或者如果你支持iOS 10. UID字段是一個整數，所以選擇任何一個核心數據的整數類型足夠大，以保持最大值。如果您對最大UID有疑問，可以安全地使用Core Data的「Integer 64」類型。

保存和提取就像任何其他核心數據屬性。

Answer 2

FUNC clearData（）{

let delegate = UIApplication.shared.delegate as? AppDelegate 

    if let context = delegate?.persistentContainer.viewContext{ 


     do { 




      let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Mydata") 

      let objects = try(context.fetch(fetchRequest)) as? [NSManagedObject] 




      for object in objects! { 
       context.delete(object) 

      } 

      try(context.save()) 


     } catch let err { 
      print(err) 
     } 
    } 


} 


func setupData() { 

     clearData() 

    let urlWithParams = "https://www.zdoof.com/api/zTimeline/ztimeline_bind?Created_by=4490&Created_on=01/jan/2017&Updated_on=14/june/2017&PageIndex=1&PageSize=50" 

    Alamofire.request(urlWithParams, method: .get, parameters: nil, encoding: JSONEncoding.default, headers: nil).responseJSON { response in 

     switch(response.result) { 
     case .success(_): 
      if let data = response.result.value as? NSArray{ 
       self.myHelp = [myHelperClass]() 





       for allData in data { 

        let help = myHelperClass() 
        let jsonID = (allData as! NSDictionary).value(forKey: "UID") as! NSInteger 
        help.myId = String.init(describing: jsonID) 

        help.myName = ((allData as! NSDictionary).value(forKey: "Name") as! NSString) as String 

        self.myNameArray.append(help.myName) 

        //       person.setValue(myName, forKey: "name") 


        DispatchQueue.main.async(execute: {() -> Void in 


         let myUrlString = "https://www.zdoof.com//" 

         let myprofileImage = (allData as! NSDictionary).value(forKey: "profimg") as! NSString 
         help.myStringImageArray = myUrlString + (myprofileImage as String) 




         let midImage = ((allData as! NSDictionary).value(forKey: "mid_img") as! NSString) as String 

         help.myStringPostImageArray = myUrlString + (midImage as String) 




        }) 





        help.Yumms = ((allData as AnyObject).value(forKey: "Postlike") as! NSString) as String 


        let kUserDefault = UserDefaults.standard 



        //       person.setValue(Yumms, forKeyPath: "postlike") 

        let myId = (allData as AnyObject).value(forKey: "UID") as!NSInteger 
        help.myidString = String.init(describing: myId) 
        //       person.setValue(myidString, forKey: "uID") 


        help.Rebcol = ((allData as AnyObject).value(forKey: "Rebcol") as! NSString) as String 
        //       person.setValue(Rebcol, forKey: "rebcol") 


        help.UTYPIMG = ((allData as AnyObject).value(forKey: "UTYPIMG") as! NSString) as String 
        //       person.setValue(UTYPIMG, forKey: "uTYPIMG") 

        help.Created_on = ((allData as AnyObject).value(forKey: "Created_on") as! NSString) as String 
        //       person.setValue(Created_on, forKey: "created_on") 

        help.UTYP = ((allData as AnyObject).value(forKey: "UTYP") as! NSString) as String 
        //       person.setValue(UTYP, forKey: "uTYP") 

        help.comments = ((allData as AnyObject).value(forKey: "Postcomment") as! NSString) as String 

        //       person.setValue(comments, forKeyPath: "postcomment") 

        help.Details = ((allData as AnyObject).value(forKey: "Details") as! NSString) as String 


        //       person.setValue(Details, forKeyPath: "details") 
        help.myPost = ((allData as AnyObject).value(forKey: "Share") as! NSString) as String 


        //       person.setValue(myPost, forKeyPath: "share") 

        help.myDate = ((allData as AnyObject).value(forKey: "zDate") as! NSString) as String 


        //       person.setValue(myDate, forKeyPath: "zDate") 


        let myPTYPEInteger = (allData as AnyObject).value(forKey: "PTYPE") as!NSInteger 

        help.myPTYPE = String.init(describing: myPTYPEInteger) 
        let myIdInteger = (allData as AnyObject).value(forKey: "ID") as!NSInteger 
        help.myId = String.init(describing: myIdInteger) 


        self.myFunction(nameFunc: help.myName, yummFunc: help.Yumms, myIdFunc: help.myidString, RebcolFunc: help.Rebcol, UTYPIMGFunc: help.UTYPIMG, Created_onFunc: help.Created_on, UTYPFunc: help.UTYP, commentsFunc: help.comments, DetailsFunc: help.Details, myPostFunc: help.myPost, myDate: help.myDate ,imageArray: help.myStringImageArray , postImageArray: help.myStringPostImageArray , myUId: help.myId , myPpTypeFunc: help.myPTYPE , myIId: help.myId) 



        kUserDefault.set(self.ID, forKey: "ID") 
        kUserDefault.set(self.PTYPE, forKey: "PTYPE") 
        kUserDefault.set(self.UID, forKey: "UID") 
        kUserDefault.synchronize() 


       } 




      } 
      DispatchQueue.main.async(execute: {() -> Void in 

       self.myTable.reloadData() 
      }) 
      break 

     case .failure(_): 
      print(response.result.error!) 
      break 

     } 


    } 




} 




func myFunction(nameFunc: String , yummFunc : String , myIdFunc : String , RebcolFunc: String , UTYPIMGFunc : String , Created_onFunc : String, UTYPFunc: String , commentsFunc : String , DetailsFunc : String ,myPostFunc : String , myDate : String ,imageArray : String , postImageArray : String , myUId : String , myPpTypeFunc : String , myIId : String) 
{ 



    let delegate = UIApplication.shared.delegate as? AppDelegate 

    if let context = delegate?.persistentContainer.viewContext{ 


     let person = NSEntityDescription.insertNewObject(forEntityName: "Mydata", into: context) as! Mydata 


     person.setValue(nameFunc, forKey: "name") 

     person.setValue(yummFunc, forKeyPath: "postlike") 
     person.setValue(myIdFunc, forKey: "uID") 
     person.setValue(RebcolFunc, forKey: "rebcol") 
     person.setValue(UTYPFunc, forKey: "uTYPIMG") 
     person.setValue(Created_onFunc, forKey: "created_on") 
     person.setValue(UTYPFunc, forKey: "uTYP") 
     person.setValue(commentsFunc, forKeyPath: "postcomment") 
     person.setValue(DetailsFunc, forKeyPath: "details") 
     person.setValue(myPostFunc, forKeyPath: "share") 
     person.setValue(myDate, forKeyPath: "zDate") 
     person.setValue(imageArray, forKeyPath: "profimg") 
     person.setValue(postImageArray, forKeyPath: "mid_img") 
     person.setValue(myUId, forKey: "iD") 
     person.setValue(myPpTypeFunc, forKey: "pTYPE") 


     do { 

      try(context.save()) 
     } catch let err { 
      print(err) 
     } 


     loadData() 

    } 



} 

FUNC loadData（）{ 令代表= UIApplication.shared.delegate爲？ AppDelegate的

if let context = delegate?.persistentContainer.viewContext { 

    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Mydata") 



    do { 



     people = try(context.fetch(fetchRequest)) as? [Mydata] 





    } catch let err { 
     print(err) 
    } 

} 

}

我曾經做過這樣的，但問題是當有互聯網連接，這是工作。沒有互聯網應用chrashes