无法在我的 collectionView 中显示来自数组（JSON）的数据

Posted 2023-03-16

【中文标题】无法在我的 collectionView 中显示来自数组（JSON）的数据

【英文标题】：Cant display data from array(JSON) in my collectionView

【发布时间】：2019-06-09 18:59:48

【问题描述】：

我是 Swift 的新人（学习了几个星期），对我的英语感到抱歉。我不知道如何避免检查方法“cellForItemAt indexPath”。我尝试使用 refreshControl 但它不起作用。我在“let arry = arrayOfData[indexPath.row] //

class ViewController: UIViewController 

    @IBOutlet weak var collectionView: UICollectionView!

    private var isRefreshing = true
    var arrayOfData = [GettingMoney]()


    override func viewDidLoad() 
        super.viewDidLoad()
        let refreshControl = UIRefreshControl()
        refreshControl.tintColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
        collectionView.refreshControl = refreshControl
        collectionView.refreshControl?.beginRefreshing()
        fetchData()

        collectionView.dataSource = self
        collectionView.delegate = self

    

    func fetchData () 
        let url = "SOMEAPI"
        guard let urlString = URL(string: url) else  return 

        URLSession.shared.dataTask(with: urlString)  (data, _, _) in
            guard let data = data else  return 

            do 

                let getData = try JSONDecoder().decode(GettingMoney.self, from: data)
                print("getSomeData")

                DispatchQueue.main.async 
                    self.arrayOfData = [getData]
                    self.collectionView?.reloadData()
                    self.collectionView.refreshControl?.endRefreshing()
                    print("reload Data")
                

             catch 
                print("Its a error")
            
            .resume()
    



extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource 
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
        return 3
    

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

        if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionCellId", for: indexPath) as? CollectionViewCell 

            let arry = arrayOfData[indexPath.row] // <-- here is got error: Fatal error: Index out of range
            print("is Ok")
            cell.currectCurrency.text = "\(arry.USD))"
            print(arrayOfData)

            return cell
        

        return UICollectionViewCell()
    

【参考方案1】：

更新numberOfItemsInSections如下，

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    return self.arrayOfData.count