【发布时间】：2021-11-06 05:05:32
【问题描述】：
我正在使用 Swift 5 构建一个应用程序。 我用 UITableView 创建了一个视图。我需要显示进度条，直到所有 Cell 都加载完毕。问题是，对于每个单元格，我都从 url 加载图像，并且我需要显示进度条，直到所有图像都加载完毕。这是代码：
import UIKit
import SwiftyJSON
class MenuSelectedVC: UIViewController, UITableViewDataSource, UITableViewDelegate, UpdateCartProtocol {
@IBOutlet weak var lblChiusura: UILabel!
@IBOutlet weak var lblStoreAddress: UILabel!
@IBOutlet weak var lblStoreName: UILabel!
@IBOutlet weak var tableViewData: UITableView!
@IBOutlet weak var viewBtnRating: UIView!
@IBOutlet weak var viewProductCart: UIView!
var store:StoreResponseModel!
var category:ProductCategory!
var products:[Product] = []
var quantity:Int!
var price:Float!
var cart:ResponseCartModel!
@IBOutlet weak var lblNumProduct: UILabel!
@IBOutlet weak var lblTotalChart: UILabel!
//MARK:- ViewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
self.showProgressBar()
tableViewData.delegate = self
tableViewData.dataSource = self
self.settingUi()
getCart()
getProductByCategory()
self.hideProgressBar()
}
func getProductByCategory(){
self.showProgressBar()
var paramDict : [String:AnyObject] = [:]
paramDict["store_id"] = store.id as AnyObject
paramDict["category_id"] = category.id as AnyObject
paramDict["activate"] = "1" as AnyObject
CommunicationManeger.callPostServiceReturnJson(apiUrl: RouterProd.get_product_by_store.url(), parameters: paramDict, parentViewController: self, successBlock: { (responseData, message) in
DispatchQueue.main.async { [self] in
do {
let products = try JSONDecoder().decode(ResponseProductModel.self, from: responseData as! Data)
if(products.status == "1") {
self.products = products.result
self.tableViewData.reloadData()
} else {
self.products = []
//self.table_List.reloadData()
Utility.noDataFound(products.message, tableViewOt: self.tableViewData, parentViewController: self)
}
}catch{
print("errore durante la decodifica dei dati: \(error)")
Utility.noDataFound("Errore", tableViewOt: self.tableViewData, parentViewController: self)
}
self.hideProgressBar()
}
}, failureBlock: { (error : Error) in
Utility.showAlertMessage(withTitle: EMPTY_STRING, message: (error.localizedDescription), delegate: nil,parentViewController: self)
self.hideProgressBar()
})
}
func updateCartFromProtocol(prodottoAggiornato: ResultCartModel) {
self.price = nil
self.quantity = nil
//devo aggiornare il prodotto appena modificato
//verifico questo prodotto a che numero riga era
let position:Int = try! searchProductPosition(nomeProdotto: prodottoAggiornato.productDetails.productName) as! Int
if(position != nil){
//dal array recupero l oggetto inq uesta posizione
self.cart.result.indices.filter { self.cart.result[$0].productDetails.productName == prodottoAggiornato.productDetails.productName}
.forEach { self.cart.result[$0].quantity = prodottoAggiornato.quantity }
let indexPosition = IndexPath(row: position, section: 0)
tableViewData.reloadRows(at: [indexPosition], with: .none)
}
getCart()
}
func getCart(){
self.showProgressBar()
var paramDict : [String:AnyObject] = [:]
paramDict["user_id"] = UserDefaults.standard.value(forKey: USERID) as AnyObject?
CommunicationManeger.callPostServiceReturnJson(apiUrl: RouterProd.get_cart.url(), parameters: paramDict, parentViewController: self, successBlock: { (responseData, message) in
DispatchQueue.main.async { [self] in
do {
self.cart = try JSONDecoder().decode(ResponseCartModel.self, from: responseData as! Data)
if(cart.status == "1") {
for product in cart.result {
if(product.type == TYPE_PRODUCT){
let detail = product.productDetails
self.updateQuantity(quantita: Int(product.quantity)!)
//se ci sono aggiunte il prezzo va
//preso dal prodotto generale altrimenti
//dal suo dettaglio
if(product.ingredientPrice.isEmpty){
self.updateTotalPrice(quantita: Int(product.quantity)!, prezzo: Float(detail.price)!)
}else{
self.updateTotalPrice(quantita: Int(product.quantity)!, prezzo: Float(product.ingredientPrice)!)
}
}
}
} else {
}
}catch{
print("errore durante la decodifica dei dati: \(error)")
}
self.hideProgressBar()
}
}, failureBlock: { (error : Error) in
Utility.showAlertMessage(withTitle: EMPTY_STRING, message: (error.localizedDescription), delegate: nil,parentViewController: self)
self.hideProgressBar()
})
}
func settingUi(){
self.viewBtnRating.setCornerRadius(cornerRadius: 14, borderColor: nil, borderWidth: nil)
viewProductCart.setCornerRadius(cornerRadius: 25, borderColor: nil, borderWidth: nil)
self.lblStoreName.text = self.store.firstName
self.lblStoreAddress.text = self.store.address
}
@IBAction func btnBack(_ sender: Any) {
self.navigationController?.popViewController(animated: true)
}
@IBAction func btnViewCart(_ sender: Any) {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "AddToCartVC") as! AddToCartVC
self.navigationController?.pushViewController(vc, animated: true)
}
//MARK:- TableView Methods
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.products.count
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if let lastVisibleIndexPath = tableViewData.indexPathsForVisibleRows?.last {
if indexPath == lastVisibleIndexPath {
print("finisco di scrivere le righe")
}
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableViewData.dequeueReusableCell(withIdentifier: "MenuSelectedCell") as! MenuSelectedCell
let obj = self.products[indexPath.row]
let image = obj.image[0].image
let url = URL(string: image)!
if let data = try? Data(contentsOf: url) {
cell.imgFood.image = UIImage(data: data)
}
cell.lblNameProduct.text = obj.productName
cell.lblDescriptionProduct.text = obj.resultDescription
cell.lblPriceProduct.text = obj.price + " €"
//devo verificare se i prodotti della categoria sono stati già selezionati oppure no.
do{
let cartObj = try? searchProduct(nomeProdotto: obj.productName)
if(cartObj != nil){
cell.lblQuantity.text = cartObj?.quantity
cell.quantita = Int(cartObj!.quantity)
}else{
cell.lblQuantity.text = "0"
cell.quantita = 0
}
}catch{
}
cell.buttonAdd.tag = indexPath.row
cell.buttonAdd.addTarget(self, action: #selector(addQuantity(button:)), for: .touchUpInside)
cell.buttonMinus.addTarget(self, action: #selector(removeQuantity(button:)), for: .touchUpInside)
return cell
}
func searchProduct(nomeProdotto: String) -> ResultCartModel?{
if(self.cart != nil){
if let i = self.cart.result.firstIndex(where: { $0.productDetails.productName == nomeProdotto }) {
return self.cart.result[i]
}
}
return nil
}
func searchProductPosition(nomeProdotto: String) -> Int?{
if(self.cart != nil){
if let i = self.cart.result.firstIndex(where: { $0.productDetails.productName == nomeProdotto }) {
return i
}
}
return nil
}
func updateQuantity(quantita: Int){
do{
if(quantity == nil){
quantity = quantita
}else{
self.quantity += quantita
}
lblNumProduct.text = String(self.quantity) + " Prodotti"
}catch{
print("caught: \(error)")
}
}
func updateTotalPrice(quantita: Int, prezzo: Float){
do{
if(self.price == nil){
self.price = Float(quantita) * prezzo
}else{
self.price += Float(quantita) * prezzo
}
lblTotalChart.text = "€ " +
Utility.twoDecimals(number: self.price!)
}catch{
print("caught: \(error)")
}
}
}
【问题讨论】：
标签： swift uitableview