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[英]how to use delegate to pass data to from one View Controller to another?
[英]How to pass data with delegate from footer cell to view controller?
我一直在尝试将数据从 FoodEatenController(FEC) 页脚传递到 TotalCaloriesController。 我现在拥有的代码在 TotalCalorieController(TCC) 的 calorieLbl 中没有显示任何内容。
我用来将数据从 FEC 传递到 TCC 的委托没有将 FoodFooter calorieTotallbl 中的文本/字符串数据传递到 TEC calorieLbl
填充 FEC 单元格的数据从 Cloud Firestore 检索并从另一个视图控制器 (FoodPickerController) 传入
import UIKit
class FoodEatenController: UIViewController{
var selectedFood: FoodList! // allows data to be passed into the VC
// allows data to be sepearted into sections
var foodItems: [FoodItem] = []
var groupedFoodItems: [String: [FoodItem]] = [:]
var dateSectionTitle: [String] = []
@IBOutlet weak var tableView: UITableView!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let vc = segue.destination as? TotalCalorieController {
}
}
}
extension FoodEatenController: UITableViewDelegate, UITableViewDataSource{
func numberOfSections(in tableView: UITableView) -> Int {
return dateSectionTitle.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let date = dateSectionTitle[section]
return groupedFoodItems[date]!.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let foodCell = tableView.dequeueReusableCell(withIdentifier: "FoodCell") as! FoodCell
let date = dateSectionTitle[indexPath.section]
let foodItemsToDisplay = groupedFoodItems[date]![indexPath.row]
foodCell.configure(withCartItems: fooditemsToDisplay.foodList)
return foodCell
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let foodHeader = tableView.dequeueReusableCell(withIdentifier: "FoodHeader") as! FoodHeader
let headerTitle = dateSectionTitle[section]
foodHeader.dateLbl.text = "Date: \(headerTitle)"
return foodHeader
}
func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
let foodFooter = tableView.dequeueReusableCell(withIdentifier: "FoodFooter") as! FoodFooter
let date = dateSectionTitle[section]
let arrAllItems = groupedFoodItems[date]!
var total: Float = 0
for item in arrAllItems {
let eaten = item.productList
let selectedMeal = item.foodList.selectedOption
if selectedMeal == 1 {
total = total + (Float(eaten!.calorie))
}
}
foodFooter.calorieTotal.text = String(subtotal!)
foodFooter.delegate = self
return foodFooter
}
}
extension FoodEatenController: EatenFoodDelegate {
func onTouchCaloireInfo(info: String) {
let popUp = self.storyboard?.instantiateViewController(withIdentifier: "AdditionalCostsVC") as! TotalCalorieController
popUp.calorieLbl.text = info
}
}
import UIKit
protocol EatenFoodDelegate: class {
func onTouchCaloireInfo(info: String)
}
class FoodFooter: UITableViewCell {
weak var delegate: EatenFoodDelegate? = nil
@IBOutlet weak var calorieTotal: UILabel!
@IBOutlet weak var totalInfoBtn: UIButton!
@IBAction func totalOnClicked(_ sender: AnyObject) {
self.delegate?. onTouchCaloireInfo(info: calorieTotal.text!)
}
}
class TotalCalorieController: UIViewController, EatenFoodDelegate {
func onTouchCaloireInfo(info: String) {
calorieLbl.text = info
}
@IBOutlet weak var calorieLbl: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func returnButton(_ sender: Any) {
dismiss(animated: true, completion: nil)
print("Close Taxes and Fees")
}
}
在func onTouchCaloireInfo(info:)
的末尾添加以下行
self.present(弹出,动画:true,完成:nil)
如果您想确保onTouchCaloireInfo(info:)
函数被调用,只需添加以下行:
debugPrint("onTouchCaloireInfo")
并检查它是否在 Xcode 的控制台中打印给定的字符串
extension FoodEatenController: EatenFoodDelegate {
func onTouchCaloireInfo(info: String) {
debugPrint("onTouchCaloireInfo")
let popUp = self.storyboard?.instantiateViewController(withIdentifier: "AdditionalCostsVC") as! TotalCalorieController
self.present(popUp, animated: true) {
popUp.calorieLbl.text = info
}
}
}
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