第一:我如何将数据从ItemVC单元传递到CartVC on button在选定单元格中单击(添加到购物车按钮(ATC))，因为我没有尝试使用didSelectRowAt将数据传递到CartVC。但是ATC btn会将像元数据传递到CartVC
我从ItemVC到CartVC的Segue在BarButtonItem(cartBtn)中，所以我不想在按下ATC按钮时跳到CartVc，而仅在按下ATC时才将选定的项目数据传递到CartVC
其次，当按下ATC时，我如何能够将lblQty中的增量/减量值传递给CartVC，从而能够呈现出更准确的小计
import UIKit
import SDWebImage
import Firebase
class ItemCell: UITableViewCell {
weak var items: Items!
@IBOutlet weak var name: UILabel!
@IBOutlet weak var category: UILabel!
@IBOutlet weak var productImage: UIImageView!
@IBOutlet weak var weight: UILabel!
@IBOutlet weak var price: UILabel!
@IBOutlet weak var lblQty: UILabel!
@IBOutlet weak var addToCart: RoundButton!
@IBOutlet weak var plusBtn: RoundButton!
@IBOutlet weak var minusBtn: RoundButton!
func configure(withItems : Items) {
name.text = product.name
category.text = items.category
image.sd_setImage(with: URL(string: items.image))
price.text = items.price
weight.text = items.weight
}
}
import UIKit
import Firebase
import FirebaseFirestore
class ItemViewController: UITableViewController {
@IBOutlet weak var cartBtn: BarButtonItem!!
@IBOutlet weak var tableView: UITableView!
var itemSetup: [Items] = []
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
fetchItems { (items) in
self.itemSetup = items.sorted
self.tableView.reloadData()
}
}
func fetchItems(_ completion: @escaping ([Items]) -> Void) {
// -** FireStore Code **-
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let vc = segue.destination as? CartViewController {
vc.items = self.itemSetup
}
}
@objc func plusItem(_ sender: UIButton) {
// -** increase Qty Code **-
}
//Function to decrement item count
@objc func minusItem(_ sender: UIButton) {
// -** decrease Qty Code **-
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return itemSetup.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "ItemCell") as? ItemCell else { return UITableViewCell() }
cell.configure(withItem: itemSetup[indexPath.row])
cell.lblQty.text = "\(self.imageSetup[indexPath.row].count)"
cell.plusBtn.tag = indexPath.row
cell.plusBtn.addTarget(self, action: #selector(self.plusItem(_:)), for: .touchUpInside)
cell.minusBtn.tag = indexPath.row
cell.minusBtn.addTarget(self, action: #selector(self.minusItem(_:)), for: .touchUpInside)
return cell
}
}
class CartViewController: UIViewController {
var items: Items!
@IBOutlet weak var cartTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
cartTableView.dataSource = self
cartTableView.delegate = self
}
}
extension CartViewController: UITableViewDataSource, UITableViewDelegate {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Cart.currentCart.cartItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CartCell", for: indexPath) as! CartCell
let cart = Cart.currentCart.CartItems[indexPath.row]
cell.qty.text = "\(cart.qty)"
cell.lblMealName.text = "\(cart.items.category): \(cart.items.name)"
cell.lblSubTotal.text = "$\(cart.items.price1 * Float(cart.qty))"
cell.imageUrl // can't figure out how to pass image
return cell
}
}
import Foundation
class CartItem {
var items: Items
var qty: Int
init(items: Items, qty: Int) {
self.items = items
self.qty = qty
}
}
class Cart {
static let currentCart = Cart()
var cartItems = [CartItem]()
}
最佳答案
只需创建一个协议即可创建委托，并在初始化单元格时将其分配给您的购物车类
protocol ItemCellDelegate {
func itemCell(didTapButton button: UIButton)
}
然后在ItemCell中有一个委托属性
class ItemCell {
weak var delegate: ItemCellDelegate?
...
// Then call the delegate method when the buttons is tapped.
func buttonTapped() {
delegate?.itemCell(didTapButton: theCellsButton)
}
}
然后使您的购物车符合委托
extension Cart: ItemCellDelegate {
func itemCell(didTapButton button: UIButton) {
// Do you stuff with button, or any other data you want to pass in
}
}
然后在返回单元格之前设置委托。
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CartCell", for: indexPath) as! CartCell
let cart = Cart.currentCart.CartItems[indexPath.row]
cell.qty.text = "\(cart.qty)"
cell.lblMealName.text = "\(cart.items.category): \(cart.items.name)"
cell.lblSubTotal.text = "$\(cart.items.price1 * Float(cart.qty))"
cell.delegate = Cart.currentCart //You should rename this static var to just 'current'
return cell
}