ios - 分页在 collectionview 中是如何工作的？

Question

我正在尝试在演示应用程序中实现分页。我正在使用 UICollectionView 来显示来自使用 SDWebImage 的 API 的大量图像。 API 支持这样的分页:

我的问题是如何将下一页的图像显示到我的收藏 View 中？

{  
   "meta":{  
      "code":200
   },
   "data":{  },
   "pagination":{  
      "total":86,
      "totalPages":3,
      "page":1,
      "nextPage":2,
      "nextPageUrl":"http://.............?page=2"
   }
}

我的目标是向 Collection View 显示此 nextPageUrl 的图片。这是我的代码:

class StoreViewController: UIViewController,UICollectionViewDataSource,UICollectionViewDelegate {

    @IBOutlet var MyStoreCollectionView: UICollectionView!


    var alldata: [PopulerMagazalarData]?
    var indexPath: IndexPath?
    var storeData : [PopulerMagazalarData] = []

    let pagenumber = 1 

    override func viewDidLoad() {
        super.viewDidLoad()

        if let indexPath = self.indexPath, let storeData = self.alldata?[indexPath.row] {

        let storeusername = storeData.username
        GetDataFromUrl(from: "https://............./\(storeusername!)?page=\(pagenumber)")

        }

   }

我的数据从 url ...

func GetDataFromUrl(from:String){

        Alamofire.request(from, method: .get).validate().responseJSON { response in
            switch response.result {
            case .success(let value):
                let json = JSON(value)

                self.storeData = [PopulerMagazalarData]()

                                       //...Creating Data Obj.

                        let data = PopulerMagazalarData()

                        let username = json["data"]["store"]["user"]["username"].string
                        let userpic = json["data"]["store"]["user"]["profilePicture"].string
                        let productsCount = json["data"]["store"]["productsCount"].int
                        let description = json["data"]["store"]["description"].string
                        let followedby = json["data"]["store"]["user"]["counts"]["followedBy"].int

                        let count:Int? = json["data"]["products"].array?.count
                        if let ct = count {

                            for index in 0...ct-1{

                        let images = json["data"]["products"][index]["images"]["standart"]["url"].string

                                data.img1 = images
                            self.storeData.append(data)
                            }
                        }

                        //*****************
                        data.username = username
                        data.profilPic = userpic
                        data.producsCount = productsCount
                        data.desc = description
                        data.followedby = followedby

                        //******************
                        self.storeData.append(data)


                    // for refresh collecitonView
                    self.refresh_now()



            case .failure(let error):
                print(error)
            }
        }
    }

    //...CollectionView ReloadData func...
    func refresh_now(){

        DispatchQueue.main.async (
            execute:
            {
                self.MyStoreCollectionView.reloadData()
        }
        )

    }

这是我的 collectionview 基金:

 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 1
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
       return 1
    }

Answer 1

请check my this answer首先，当 footerview 出现时，将页脚 View 添加到您的 collectionview 进行网络调用，将新数组附加到先前的数组并重新加载您的 collectionview