这里我已经为表视图实现了分页，并且使用模型类加载了项目，但是这里加载的项目正在替换为新项目，并且一次只显示10个项目我是第一次实现它可以任何人帮助我该如何解决这个问题？
func listCategoryDownloadJsonWithURL(listUrl: String) {
let url = URL(string: listUrl)!
print(listUrl)
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil { print(error!); return }
do {
if let jsonObj = try JSONSerialization.jsonObject(with: data!) as? [String:Any] {
self.listClassModel = ModelClass(dict: jsonObj as [String : AnyObject])
DispatchQueue.main.async {
guard let obj = self.listClassModel else { return }
let itemsCount = obj.items.count
print(itemsCount)
for i in 0..<itemsCount {
let customAttribute = obj.items[i].customAttribute
for j in 0..<customAttribute.count {
if customAttribute[j].attributeCode == "image" {
let baseUrl = "http://192.168.1.11/magento2/pub/media/catalog/product"
self.listCategoryImageArray.append(baseUrl + customAttribute[j].value)
print(self.listCategoryImageArray)
}
}
}
self.activityIndicator.stopAnimating()
self.activityIndicator.hidesWhenStopped = true
self.collectionView.delegate = self
self.collectionView.dataSource = self
self.collectionView.reloadData()
self.collectionView.isHidden = false
self.tableView.reloadData()
}
}
} catch {
print(error)
}
}
task.resume()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let obj = listClassModel?.items
return obj?.count ?? 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "productsCell", for: indexPath) as! productsCell
let arr = listClassModel?.items[indexPath.row]
let images = listCategoryImageArray[indexPath.row]
let urls = NSURL(string: images)
self.tableView.isHidden = false
cell.productImage.hnk_setImageFromURL(urls! as URL)
cell.productName.lineBreakMode = NSLineBreakMode.byWordWrapping
cell.productName.numberOfLines = 2
cell.productName.text = arr?.name
cell.productPrice.text = "$\( (arr?.price)!).00"
cell.buynowButton .addTarget(self, action: #selector(buyNowButton(_:)), for:UIControlEvents.touchUpInside)
cell.cartButton .addTarget(self, action: #selector(cartButton(_:)), for:UIControlEvents.touchUpInside)
return cell
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let obj = listClassModel?.items
let lastElement = (obj?.count)! - 1
if !loadingData && indexPath.row == lastElement {
loadingData = true
loadMoreData()
}
}
这是将新数据导入表视图的代码
func loadMoreData() {
DispatchQueue.global(qos: .background).async {
guard let obj = self.listClassModel else { return }
let totalItems = obj.totalCount
let numberOfItems = obj.searchCriteria.pageSize
var count = 0
let float = Float(totalItems)/Float(numberOfItems)
print(float.cleanValue)
let totalPages = Int(ceil(float))
if totalPages != count {
let batchSize = 10
self.index += 1
count += 1
print(self.index)
let sortOrder = "ASC"
let conditionType = "eq"
let sortField = "name"
let listUrlWithParameters = "http://192.168.1.11/magento2/rest/V1/products?searchCriteria[filterGroups][0][filters][0][field]=category_id&searchCriteria[filterGroups][0][filters][0][value]=17&searchCriteria[filterGroups][0][filters][0][conditionType]=\(conditionType)&searchCriteria[sortOrders][0][field]=\(sortField)&searchCriteria[sortOrders][0][direction]=\(sortOrder)&searchCriteria[pageSize]=\(batchSize)&searchCriteria[currentPage]=\(self.index)"
self.listCategoryDownloadJsonWithURL(listUrl: listUrlWithParameters)
}
DispatchQueue.main.async {
// this runs on the main queue
self.loadingData = false
}
}
}
struct ModelClass {
var items : [List]
var totalCount : Int
var searchCriteria : SearchCriteria
init(dict:[String:AnyObject]) {
totalCount = dict["total_count"] as! Int
let searchDict = dict["search_criteria"] as? [String:AnyObject]
searchCriteria = SearchCriteria(dict: searchDict!)
let arr = dict["items"] as? [[String:AnyObject]]
var listArr = [List]()
for obj in arr! {
listArr.append(List(dict: obj))
}
items = listArr
}
}
struct List {
let name : String
let sku : Any
let id : Int
let attributeSetId : Int
let price : Int
let status : Int
let visibility : Int
let typeId: String
let createdAt : Any
let updatedAt : Any
var customAttribute = [ListAttribute]()
init(dict : [String:Any]) {
if let customAttribute = dict["custom_attributes"] as? [[String: AnyObject]] {
var result = [ListAttribute]()
for obj in customAttribute {
result.append(ListAttribute(json: obj)!)
}
self.customAttribute = result
} else {
self.customAttribute = [ListAttribute]()
}
self.name = (dict["name"] as? String)!
self.sku = dict["sku"]!
self.id = (dict["id"] as? Int)!
self.attributeSetId = (dict["attribute_set_id"] as? Int)!
self.price = (dict["price"] as? Int)!
self.status = (dict["status"] as? Int)!
self.visibility = (dict["visibility"] as? Int)!
self.typeId = (dict["type_id"] as? String)!
self.createdAt = dict["created_at"]!
self.updatedAt = dict["updated_at"]!
}
}
struct ListAttribute {
let attributeCode : String
let value : String
init?(json : [String:AnyObject]) {
self.attributeCode = (json["attribute_code"])! as! String
self.value = (json["value"])! as! String
}
}
struct SearchCriteria {
var filterGroup : [FilterGroup]
var sortGroup : [SortGroup]
var pageSize : Int
var pageNumber : Int
init(dict:[String:AnyObject]) {
if let arr = dict["filter_groups"] as? [[String: AnyObject]]{
var filterArr = [FilterGroup]()
for obj in arr {
filterArr.append(FilterGroup(dict: obj))
}
self.filterGroup = filterArr
} else {
self.filterGroup = [FilterGroup]()
}
if let arr = dict["sort_orders"] as? [[String: AnyObject]]{
var filterArr = [SortGroup]()
for obj in arr {
filterArr.append(SortGroup(dict: obj))
}
self.sortGroup = filterArr
} else {
self.sortGroup = [SortGroup]()
}
self.pageSize = dict["page_size"] as! Int
self.pageNumber = dict["current_page"] as! Int
}
}