<分区>
我正在构建一个订餐应用程序。其中，有递增和递减按钮和一个显示数量的 UILabel。我想在点击递增和递减按钮时更新数量标签。附上其图像。
My ViewController 的一个片段是
protocol GondolaTableViewCellDelegate: class {
func tableViewCellAddToCart(_ sender: ItemDetailTableViewCell)
func tableViewCellIncrement(_ sender: ItemDetailTableViewCell)
func tableViewCellDecrement(_ sender: ItemDetailTableViewCell)
var tableViewCellQuantity: String { get set }
}
class ItemDetailTableViewCell: UITableViewCell {
//itemTableCell
var quantity = 1
@IBOutlet weak var itemNameLabelCell: UILabel!
@IBOutlet weak var itemDescLabelCell: UILabel!
@IBOutlet weak var itemPriceLabelCell: UILabel!
@IBOutlet weak var itemQuantityLabelCell: UILabel!
@IBOutlet weak var itemDecrementButton: UIButton!
@IBOutlet weak var itemIncrementButton: UIButton!
@IBOutlet weak var addToCartButton: UIButton!
weak var delegate: GondolaTableViewCellDelegate?
@IBAction func addToCartCellButton(_ sender: Any) {
delegate?.tableViewCellAddToCart(self)
//print("Neck, Angel Memory")
}
@IBAction func itemIncrementButtonCell(_ sender: Any) {
delegate?.tableViewCellIncrement(self)
//quantity = quantity+1
//itemQuantityLabelCell.text = "\(quantity)"
}
@IBAction func itemDecrementButtonCell(_ sender: Any) {
delegate?.tableViewCellDecrement(self)
// if quantity == 1 {
// //toastNeck(message: "Min. quantity should be 1")
// }else if quantity >= 2 {
// //quantity = quantity-1
// }
//itemQuantityLabelCell.text = "\(quantity)"
}
}
class AllItemViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, GondolaTableViewCellDelegate {
var tableViewCellQuantity: String = ""
@IBOutlet weak var allItemImageHeader: UIImageView!
@IBOutlet weak var allItemTableView: UITableView!
@IBOutlet weak var allItemLabel: UILabel!
@IBOutlet weak var visualEffect: UIVisualEffectView!
@IBOutlet weak var itemsTableView: UITableView!
@IBOutlet weak var itemDetailLabel: UILabel!
@IBOutlet weak var cartItemLabel: UILabel!
var storeItem = [StoreItem]()
var allItem = [ItemDetaill]()
var quantityArray: [Int] = []
var selectedIndex: Int!
var storeId: String = ""
var storeCatId: String = ""
var storeName: String = ""
var quantity = 1
override func viewDidLoad() {
super.viewDidLoad()
for i in 0 ..< 100 {
quantityArray.append(2)
}
allItemTableView.delegate = self
allItemTableView.dataSource = self
itemsTableView.delegate = self
itemsTableView.dataSource = self
}
func numberOfSections(in tableView: UITableView) -> Int {
return tableView === allItemTableView ? storeItem.count : allItem.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1 //storeItem.count
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 5
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let header = UIView()
header.backgroundColor = UIColor.white
return header
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return tableView === allItemTableView ? 56 : 100
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if tableView == allItemTableView {
let storeCell = allItemTableView.dequeueReusableCell(withIdentifier: "allItemCell", for: indexPath) as! AllItemTableViewCell
return storeCell
}else {
let itemCell = itemsTableView.dequeueReusableCell(withIdentifier: "itemTableCell", for: indexPath) as! ItemDetailTableViewCell
itemCell.itemNameLabelCell.text = allItem[indexPath.section].item_name
itemCell.itemDescLabelCell.text = allItem[indexPath.section].item_desc
itemCell.itemPriceLabelCell.text = "₹" + allItem[indexPath.section].item_net_price
itemCell.delegate = self
itemCell.addToCartButton.tag = indexPath.section
itemCell.addToCartButton.addTarget(self, action: #selector(addToCarts(_:)), for: .touchUpInside)
itemCell.itemIncrementButton.tag = indexPath.section
itemCell.itemIncrementButton.addTarget(self, action: #selector(increment(_:)), for: .touchUpInside)
itemCell.itemDecrementButton.tag = indexPath.section
itemCell.itemDecrementButton.addTarget(self, action: #selector(decrement(_:)), for: .touchUpInside)
return itemCell
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectedIndex = indexPath.section
if tableView == allItemTableView {
}else {
let itemCell = itemsTableView.cellForRow(at: indexPath)
print("Will Work")
}
}
@objc func increment(_ sender: UIButton) {
quantity = quantity + 1
tableViewCellQuantity = "\(quantity)"
//let newQuantity = quantityArray[sender.tag] + 1
//self.quantityArray.replaceSubrange(sender.tag, with: newQuantity)
itemsTableView.reloadData()
}
@objc func decrement(_ sender: UIButton) {
if quantity == 1 {
toastNeck(message: "Min. quantity should be 1")
}else if quantity >= 2 {
quantity = quantity - 1
}
tableViewCellQuantity = "\(quantity)"
itemsTableView.reloadData()
}
@objc func addToCarts(_ sender: UIButton) {
if sender.tag == 0 {
print(storeItem[sender.tag].item_name)
}
}
func tableViewCellAddToCart(_ sender: ItemDetailTableViewCell) {
guard let tappedIndexPath = itemsTableView.indexPath(for: sender) else {
return
}
print(allItem[tappedIndexPath.section].item_name)
}
func tableViewCellIncrement(_ sender: ItemDetailTableViewCell) {
guard let tappedIndexPath = itemsTableView.indexPath(for: sender) else {
return
}
print(allItem[tappedIndexPath.section].created_date)
quantity = quantity + 1
tableViewCellQuantity = "\(quantity)"
//let newQuantity = quantityArray[tappedIndexPath.section] + 1
//self.quantityArray.replaceSubrange(tappedIndexPath.count, with: <#T##Collection#>)
}
func tableViewCellDecrement(_ sender: ItemDetailTableViewCell) {
guard let tappedIndexPath = itemsTableView.indexPath(for: sender) else {
return
}
if quantity == 1 {
toastNeck(message: "Min. quantity should be 1")
}else if quantity >= 2 {
quantity = quantity - 1
}
tableViewCellQuantity = "\(quantity)"
itemsTableView.reloadData()
print(allItem[tappedIndexPath.section].id)
}
func tableViewCellQuantity(_ sender: ItemDetailTableViewCell) {
}
}
但是我能够通过协议(protocol)检测按钮点击，但无法更新 UILabel。
我还需要将添加的项目存储到数据模型类中，并且必须是不同项目的不同值，这意味着每个项目应该存储不同的数量。
有个类似的问题here但它不起作用。
如果有人需要更多详细信息，请告诉我。