无法在 Swift 的 Collectionview(错误:索引超出范围)中显示所有 JSON 响应值 [英] Unable to show all JSON response values in Collectionview(ERROR: Index out of range) in Swift

问题描述

我在tableview单元格中使用collectionview..在这里我想在collectionview中向tableview单元格显示一个值..但我一直只得到一个filename值，即使它有一组值

I am using collectionview in tableview cell.. here i want to show tableview cells one value in collectionview.. but all the time i am getting only one filename value even it has array of values

我在控制台中的 JSON 响应:

my JSON response in console:

JSON: {
result =     {
    bids =         (
                    {
         
            "get_attachments" =                 (
                                    {
                    filename = "1627385763-6142.png";
                },
                                    {
                    filename = "1627388474-7134.jpeg";
                },
                                    {
                    filename = "1627398168-8608.jpeg";
                }
            );
            "get_bid_user" =                 {
               
                fname = "new user";
                gender = M;
            };
        },
                    {
            "get_attachments" =                 (
                                    {
                                        
                    filename = "1627387642-9066.jpg";
                    
                }
            );
            "get_bid_user" =                 {
                fname = Akash;
                gender = M;
            };
        }
    );

JSON

public class ViewProposalResult {
public var bids : Array<Bid>?
}

public class Bid {

public var get_attachments : Array<Get_attachments>? 
 }

public class Get_attachments {
public var filename : String?
}

这里我想要 get_attachments 所有 filename 值在 collectionview .. 怎么样?

here i want get_attachments all filename values in collectionview.. how?

对于 tableview 和 collectionview 代码:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

let cell = tableView.dequeueReusableCell(withIdentifier: "ViewProposalTableVIewCell", for: indexPath) as! ViewProposalTableVIewCell


var bidData = viewproposalData?.result?.bids?[indexPath.row]

cell.bidAttatchment = bidData?.get_attachments

cell.attetchmentsCollectionview.reloadData()
return cell
}

//collectionview code
class ViewProposalTableVIewCell: UITableViewCell, UICollectionViewDelegate,UICollectionViewDataSource {


@IBOutlet weak var attetchmentsCollectionview: UICollectionView!

public var bidAttatchment: Array<Get_attachments>?

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return bidAttatchment?[section].filename?.count ?? 0
}

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

    var attatchBid = bidAttatchment?[indexPath.item]//getting error "Index out of range:"
    cell.attatchmentLbl.text = attatchBid?.filename
    
    
    return cell
}

错误:

致命错误:索引超出范围

Fatal error: Index out of range

我哪里错了.请指导我

推荐答案

首先统一变量的命名，明确什么是单个对象，什么是数组.

First of all consolidate the naming of the variables to make clearer what is a single object and what is an array.

• 将 bidAttatchment 替换为 attachments(复数形式)
• 将 Get_attachments 替换为 Attachment(单数形式)
• 将数组声明为非可选的空数组.好处是你摆脱了所有的问号

• Replace bidAttatchment with attachments (plural form)
• Replace Get_attachments with Attachment (singular form)
• Declare the array as non-optional empty array. The benefit is you get rid of all the question marks

然后在 numberOfItemsInSection 中返回 attachments 中的项目数.您的数据源不包含部分，因此 section 参数无关紧要.

Then in numberOfItemsInSection just return the number of items in attachments. Your data source doesn't contain sections so the section parameter is irrelevant.

class ViewProposalTableVIewCell: UITableViewCell, UICollectionViewDelegate,UICollectionViewDataSource {
    
    
    @IBOutlet weak var attetchmentsCollectionview: UICollectionView!
    
    public var attachments = Array<Attachment>()
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return attachments.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "BidAttatchmentCollectionViewCell", for: indexPath) as! BidAttatchmentCollectionViewCell
    
        let attatchBid = attachments[indexPath.item]
        cell.attatchmentLbl.text = attatchBid.filename
        
        return cell
    }

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