ios - 将 id 传递到另一个屏幕以显示特定的 id - 产品及其详细信息

Question

我有一个 Collection View ，它必须只显示类别名称及其图像。我通过一些 api 调用来显示这个类别名称、图像。而且对于每个类别名称，我将获得每个类别名称的客户 ID。这是完整的代码

 func apicalling () {

        let headers = [
            "content-type": "application/json",
            "cache-control": "no-cache",
            "postman-token": "7adebcbe-18b4-d2a7-2159-2fbcaea27edd"
        ]
        let parameters = [
            "customerID": "1",
            "listType": "2"
        ]
        do {
            let postData = try JSONSerialization.data(withJSONObject: parameters, options :[])
            let request = NSMutableURLRequest(url: NSURL(string: "http://example/categoryname.php")! as URL,
                                              cachePolicy: .useProtocolCachePolicy,timeoutInterval: 10.0)
            request.httpMethod = "POST"
            request.allHTTPHeaderFields = headers
            request.httpBody = postData

            let session = URLSession.shared
            let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
                if (error != nil) {
                    ///print(error)
                } else {

                    DispatchQueue.main.async(execute: {

                        if let json = (try? JSONSerialization.jsonObject(with: data!, options: [])) as? Dictionary<String,AnyObject>
                        {
                            let status = json["status"] as? Int;
                            if(status == 1)
                            {
                                //print("SUCCESS....")
                                if let typeValues = json["categories"] as? [NSDictionary]
                                {
                                    DispatchQueue.main.async(execute: {

                                       // print("INSIDE CATEGORIES")

                                        for item in typeValues
                                        {
                                           // print("INSIDE LISTING ITEMS...")

                                            self.BTdata.append(BTData(json:item))

                                        }

                                        //print(self.BTdata[0].BTNames)


                                         self.collectionView!.reloadData()

                                    })
                                }

                            }

                        }
                    })

                }
            })

            dataTask.resume()
        } catch {
            // print("JSON serialization failed:  \(error)")
        }
    }

 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
 {
       return BTdata.count
 }

 func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
 {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell

         cell.CatName.text = BTdata[(indexPath as NSIndexPath).row].BTNames

        let imgURL: URL = URL(string: BTdata[(indexPath as NSIndexPath).row].BTImage!)!

        let request: URLRequest = URLRequest(url: imgURL)

        let session = URLSession.shared

        let task = session.dataTask(with: request, completionHandler: {
            (data, response, error) -> Void in

            if (error == nil && data != nil)
            {
                func display_image()
                {
                    cell.ProductImg.image = UIImage(data:data!)
                }

              DispatchQueue.main.sync(execute: display_image)
            }
        })

        task.resume()

      return cell
  }

 func getIndexPathForSelectedCell() -> IndexPath?
 {
        var indexPath:IndexPath?

        if collectionView.indexPathsForSelectedItems!.count > 0 {
            indexPath = collectionView.indexPathsForSelectedItems![0]
        }
     return indexPath
 }

 override func prepare(for segue: UIStoryboardSegue, sender: Any?)
 {
        if segue.identifier == "showDetails"
        {
            if let indexPath = getIndexPathForSelectedCell()
            {
                let ContainerviewController = segue.destination as! DetailVC

                ContainerviewController.BTdata = [BTdata[(indexPath as NSIndexPath).row]]

                print("Printing value on collection click.....")

                print(BTdata[(indexPath as NSIndexPath).row].BTIds)

            }
        }
    }

从我上面的代码中你可以看到，我已经完成了到另一个 View Controller 的转场。我正在将 ID 传递给另一个 View Controller 。在另一个 View Controller 中，我需要显示用户在我的第一个 View Controller 中选择的产品项目。

在我的第二个 View Controller 中，我做了一些 api 来显示所有产品。所以流程是:

1. 当用户在我的第一个 View Controller 中按下任何类别名称时，它必须转到第二个 View Controller ，并且应该是所选类别名称的特定产品。这是我的第二个 VC 的代码:

   在这里，我从我的第一个 vc 中获取用户单击任何类别名称的 ID:

   override func viewDidLoad() {
   
        super.viewDidLoad()
   
       self.BTypeId = BTdata[0].BTIds
       Allproductapicalling ()
   }
   
   func Allproductapicalling () {
   
       let headers = [
           "content-type": "application/json",
           "cache-control": "no-cache",
           "postman-token": "c98d0000-637b-1efc-8f93-f9e277ffefcd"
       ]
       let parameters = [
           "customerID": "1",
           "listType": "1"
       ]
   
       do {
           let postData = try JSONSerialization.data(withJSONObject: parameters, options :[])
           let request = NSMutableURLRequest(url: NSURL(string: "http://exp.php")! as URL,
                                             cachePolicy: .useProtocolCachePolicy,timeoutInterval: 10.0)
           request.httpMethod = "POST"
           request.allHTTPHeaderFields = headers
           request.httpBody = postData
   
           let session = URLSession.shared
           let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
               if (error != nil) {
                   ///print(error)
               } else {
   
                   DispatchQueue.main.async(execute: {
   
                       if let json = (try? JSONSerialization.jsonObject(with: data!, options: [])) as? Dictionary<String,AnyObject>
                       {
                           let status = json["status"] as? Int;
                           if(status == 1)
                           {
                               print("SUCCESS....")
   
                               if let typeValues = json["products"] as? [NSDictionary]
                               {
                                   DispatchQueue.main.async(execute: {
   
                                       print("INSIDE CATEGORIES")
   
                                        for item in typeValues {
   
                                           let bId = item.value(forKey: "categoryID") as! String
   
                                           if(bId == self.BTypeId) {
   
                                              self.Productdata.append(ProductData(json:item))
   
                                           }
                                       }
   
                                   })
   
                                   //print("Product Name : ", self.Productdata[0].proName)
                               }
   
                           }
   
                       }
                   })
   
               }
           })
   
           dataTask.resume()
   
   
   
       } catch {
           // print("JSON serialization failed:  \(error)")
       }
   }
   

我的问题出在 api 调用代码上面的这一行中:

if let typeValues = json["products"] as? [NSDictionary]
{
        DispatchQueue.main.async(execute: {
                for item in typeValues {
                   let bId = item.value(forKey: "categoryID") as! String
                         if(bId == self.BTypeId) {
                                self.Productdata.append(ProductData(json:item))
                         }
                       }

                   })

我正在从我的第一个 VC 中获取选定的类别 ID，并且我正在与调用类别 ID 的所有产品 API 进行比较。我需要单独展示该特定产品。该怎么做？？

if(bId == self.BTypeId)

请帮帮我。

谢谢

Answer 1

 DispatchQueue.main.async(execute: {
   for item in typeValues {
       let bId = item.value(forKey: "categoryID") as! String
       if(bId as? String == self.BTypeId) {
               print("Hurray sathish......")
               self.Productdata.append(ProductData(json:item))

               // print(self.Productdata.append(bId))

        }
     }
     self.Collectionview.delegate = self
     self.Collectionview.dataSource = self
     self.Collectionview.reloadData()
 })

 func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
 {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! DetailCollectionviewcell

        cell.DetailProductName.text = Productdata[indexPath.row].proDescription

        let imgURL: URL = URL(string: Productdata[indexPath.row].proImage!)!

        let request: URLRequest = URLRequest(url: imgURL)

        let session = URLSession.shared

        let task = session.dataTask(with: request, completionHandler: {
            (data, response, error) -> Void in

            if (error == nil && data != nil)
            {
                func display_image()
                {
                    cell.DetailImage.image = UIImage(data:data!)
                }


                DispatchQueue.main.sync(execute: display_image)
            }
        })

        task.resume()


        return cell
    }

你的输出:

您的问题已解决批准答案并放弃投票谢谢。快乐编码。