问题描述
您好，我正在尝试构建订购食品应用程序，但我遇到了一个问题，我想为多个viewController分隔cartTableViewController。 我不知道如何解释它，因为我的英语太糟糕了，但是我会尽力解释它。。。我的意思是说，用户已经从burgerKingViewController添加到cartTableViewController了，然后他继续使用mcdonaldsViewController将项目添加到cartTableViewController，在这里，我想向用户显示一个警报，说他在burgerKingViewController的购物车中有一个项目，应该删除它，以便可以从mcdonaldsViewController添加项目
为了进一步简化它..我希望cartTableViewController仅处理一个餐厅，这样我才能从firebase接受订单。
谢谢。
这是我用来将商品添加到cartTableViewController的代码
import UIKit
struct userData {
static var selectedItem: Item? = nil
static var selectedItems: [Item] = []
static func selectedItemsPrice() -> Double {
var result: Double = 0
for item in selectedItems {
result = result + item.price
}
return result
}
static func allItemsToString() -> String {
var allNames: [String] = []
for item in selectedItems {
allNames.append(item.name)
}
return allNames.joined(separator: ",")
}
}
struct Item: Equatable {
static let items : [Item] = {
let food: Item = .init(image: UIImage(named: “food”)!,name: “food,price: 50)
return [food]
}()
var image: UIImage?
var name: String
var price: Double
}
这是cartTableViewController
import UIKit
class cartTableViewController: UITableViewController {
@IBOutlet var checkOutpressed: UIButton!
@IBOutlet var priceLabel: UILabel!
@IBOutlet var cartView: UIView!
@IBOutlet var totalOrder: UILabel!
@IBOutlet var cartTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
overrideUserInterfaceStyle = .light
checkOutpressed.layer.cornerRadius = 4.0
}
override func viewWillAppear(_ animated: Bool) {
priceLabel.text = "\(userData.selectedItemsPrice())"
totalOrder.text = "\(userData.allItemsToString())"
super.viewWillAppear(animated)
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation,return the number of sections
return 1
}
override func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation,return the number of rows
return userData.selectedItems.count
}
override func tableView(_ tableView: UITableView,heightForRowAt indexPath: IndexPath) -> CGFloat {
105
}
override func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cartCell") as! cartTableViewCell
cell.cartimage.layer.masksToBounds = true
cell.cartimage.layer.cornerRadius = 8
cell.cartimage.translatesAutoresizingMaskIntoConstraints = false
cell.cartimage.contentMode = .scaleAspectFill
cell.cartLabel.textColor = .black
cell.cartLabel.translatesAutoresizingMaskIntoConstraints = false
cell.selectionStyle = .none
let cart = userData.selectedItems[indexPath.row]
cell.cartimage.image = cart.image
cell.cartLabel.text = cart.name
cell.priceLabel1.text = “\(cart.price)"
return cell
}
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView,canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
// Override to support editing the table view.
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView,moveRowAt fromIndexPath: IndexPath,to: IndexPath) {
}
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView,canMoveRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return true
}
override func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath) {
}
// MARK: - Navigation
// In a storyboard-based application,you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
}
override func tableView(_ tableView: UITableView,commit editingStyle: UITableViewCell.EditingStyle,forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// remove the item from the data model
userData.selectedItems.remove(at: indexPath.row)
// delete the table view row
tableView.deleteRows(at: [indexPath],with: .fade)
priceLabel.text = "\(userData.selectedItemsPrice())"
totalOrder.text = "\(userData.allItemsToString())"
} else if editingStyle == .insert {
// Not used in our example,but if you were adding a new row,this is where you would do it.
}
}
@IBAction func checkOutpressed(_ sender: UIButton) {
if priceLabel.text! == "" || totalOrder.text! == "" {
// Alert
let optionMenu = UIAlertController(title: nil,message: “please add item”,preferredStyle: .alert)
// Add actions to the menu
let cancelAction = UIAlertAction(title: "OK",style: .cancel,handler:
nil)
optionMenu.addAction(cancelAction)
// display the menu
self.present(optionMenu,animated: true,completion: nil)
}
}
}
这是burgerKingViewController
import UIKit
class burgerKingViewController: UIViewController {
@IBOutlet var burgerKingImage: UIImageView!
@IBOutlet var burgerKingName: UILabel!
@IBOutlet var burgerKingPrice: UILabel!
@IBOutlet var makeOrder: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
overrideUserInterfaceStyle = .light
makeOrder.layer.cornerRadius = 4.0
}
@IBAction func makeOrder(_ sender: UIButton) {
let alert = UIAlertController(title: "",message: “done”,preferredStyle: .alert)
self.present(alert,completion: nil)
let when = dispatchTime.Now() + 1
dispatchQueue.main.asyncAfter(deadline: when) {
// your code with delay
alert.dismiss(animated: true,completion: nil)
}
userData.selectedItems.append(Item(image: UIImage(named: “burgerKing”),name: “burgerKing”,price: Double(10.000)))
self.aimateView(sender)
}
fileprivate func aimateView( _ viewToAnimate:UIView) {
UIView.animate(withDuration: 0.5,delay: 0,usingSpringWithdamping: 0.2,initialSpringVeLocity: 2,options: .curveEaseIn,animations: {
viewToAnimate.transform = CGAffineTransform(scaleX: 0.92,y: 0.92)
}) { (_) in
UIView.animate(withDuration: 0.5,usingSpringWithdamping: 0.4,animations: {
viewToAnimate.transform = CGAffineTransform(scaleX: 1,y: 1)
},completion: nil)
}
}
}
这是mcdonaldsViewController
import UIKit
class mcdonaldsViewController: UIViewController {
@IBOutlet var mcdonaldsImage: UIImageView!
@IBOutlet var mcdonaldsName: UILabel!
@IBOutlet var mcdonaldsPrice: UILabel!
@IBOutlet var makeOrder: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
overrideUserInterfaceStyle = .light
makeOrder.layer.cornerRadius = 4.0
}
@IBAction func makeOrder(_ sender: UIButton) {
let alert = UIAlertController(title: "",completion: nil)
// change to desired number of seconds (in this case 5 seconds)
let when = dispatchTime.Now() + 1
dispatchQueue.main.asyncAfter(deadline: when) {
// your code with delay
alert.dismiss(animated: true,completion: nil)
}
userData.selectedItems.append(Item(image: UIImage(named: "mcdonalds"),name: "mcdonalds",completion: nil)
}
}
}
解决方法
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