核心数据 id 和 Web JSON api id 不匹配？

Question

我无法匹配 Core Data 书签 ID 和 JSON Web API ID，我无法将图像从 JSON API 保存到 Core Data。

主类

import UIKit
import MapKit
import CoreLocation
import SDWebImage
import CoreData
class InfoViewController: UIViewController  , MKMapViewDelegate,CLLocationManagerDelegate{
 var get_details : schools?
 var bookmark : [Bookmark] = []

 var bookmark_details : Bookmark?


 override func viewDidLoad() {
        super.viewDidLoad()
}

        func bookmarktoCoredata(){
        let alert = UIAlertController(title: "Add BookMark", message: "", preferredStyle: .alert)
        let add = UIAlertAction(title: "Add", style: .default){
            (action) in

//            for bkms in self.bookmark
//            {
//                if ((bkms.name)) == ((self.get_details?.name)!){
//                   
//                    print("same name")
//
//                }else{
//                     print("not same")
//                }
//            }

            let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext


            let task = Bookmark(context: context)

            if (task.bookmark_id) == Int16((self.get_details?.schoolid)!){
                print("same id")
            }
            else
            {
                print("not same id")
                task.bookmark_id = Int16((self.get_details?.schoolid)!)

                task.name = self.get_details?.name
                task.address = self.get_details?.address
                task.district = self.get_details?.district
                task.country = self.get_details?.country
                task.phone = self.get_details?.phone
                task.email = self.get_details?.email
                task.website = self.get_details?.website
                task.institution = self.get_details?.institution_type
                task.establishment = self.get_details?.establishment_date
                task.admission_open = self.get_details?.admission_open_from
                task.admission_end = self.get_details?.admission_open_from
                task.latitude = (self.get_details?.latitude)!
                task.longitude = (self.get_details?.longitude)!
                task.bookmark_type = "school"

//              let img = UIImage(named: "App.png") //Sending direct image its working
                let img = UIImage(named: (self.get_details?.logo)!) //by Json it sendong nil
                let imgdata = UIImageJPEGRepresentation(img!, 1)
                task.logo = imgdata! as NSData


            (UIApplication.shared.delegate as! AppDelegate).saveContext()

            }

        }
        let cancel = UIAlertAction(title: "Cancel", style: .cancel){
            (alert) in
//            JLToast.makeText("Your Bookmark Cancel !!").show()
        }
        alert.addAction(add)
        alert.addAction(cancel)
        present(alert, animated: true, completion: nil)
    }

我不知道为什么我的代码是错误的。

Answer 1

您没有获取带有 id 的书签。试试这个：

import UIKit
import MapKit
import CoreLocation
import SDWebImage
import CoreData
class InfoViewController: UIViewController {
var get_details : schools?
var bookmark : [Bookmark] = []

var bookmark_details : Bookmark?

override func viewDidLoad() {
    super.viewDidLoad()
}

func bookmarktoCoredata(){
    let alert = UIAlertController(title: "Add BookMark", message: "", preferredStyle: .alert)
    let add = UIAlertAction(title: "Add", style: .default) {
        (action) in

        let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
        let fetchId = Int16((self.get_details?.schoolid)!
        let bookmarkFetch: NSFetchRequest<Bookmark> = NSFetchRequest(entityName: "Bookmark")
        bookmarkFetch.predicate = NSPredicate(format: "bookmark_id == %d", fetchId)
        do {
            let fetchedBookmarks = try context?.fetch(bookmarkFetch)
            // you should find 1
            if fetchedBookmarks?.count == 1 {
                print("same id")
            } else if fetchedBookmarks?.count == 0 {
                // There is no Bookmark with this id so create a new one
                let task = Bookmark(context: context)
                // Populate all the properties here and save
                task.bookmark_id = Int16((self.get_details?.schoolid)!)

                task.name = self.get_details?.name
                task.address = self.get_details?.address
                task.district = self.get_details?.district
                task.country = self.get_details?.country
                task.phone = self.get_details?.phone
                task.email = self.get_details?.email
                task.website = self.get_details?.website
                task.institution = self.get_details?.institution_type
                task.establishment = self.get_details?.establishment_date
                task.admission_open = self.get_details?.admission_open_from
                task.admission_end = self.get_details?.admission_open_from
                task.latitude = (self.get_details?.latitude)!
                task.longitude = (self.get_details?.longitude)!
                task.bookmark_type = "school"
                // I don't know the type of get_details?.logo
                if let imgdata = self.get_details?.logo as? NSData {
                    task.logo = UIImage(data: imgdata)
                }

                // Save your changes
                (UIApplication.shared.delegate as! AppDelegate).saveContext()
            } else {
                // If you get here you have more than one with the same id. Fix error
            }
        } catch {
            fatalError("Failed to fetch bookmark: \(error)")
        }
    }
    let cancel = UIAlertAction(title: "Cancel", style: .cancel){
        (alert) in
//        JLToast.makeText("Your Bookmark Cancel !!").show()
    }
    alert.addAction(add)
    alert.addAction(cancel)
    present(alert, animated: true, completion: nil)
}


// MARK: - MKMapViewDelegate
extension InfoViewController: MKMapViewDelegate {
    //Put your MKMapViewDelegate functions here
}

// MARK: - CLLocationManagerDelegate
extension InfoViewController: CLLocationManagerDelegate {
    //Put your CLLocationManagerDelegate functions here
}