How to compare values of two different UIPickerView? - ios

Question

I have custom UITableViewController with two custom UITableViewCell
Each of them contains UIPickerView
I want to compare values of these UIPickerViews
(I make the Maps App, and i wanna make the route, so i need do compare two points, and if they are different then "Make The Route" button will be set to Enabled State)
How can i do this? I tried to use didSet values, but it didn't work
Here are my classes:
class PlaceForRouteCell: UITableViewCell, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var picker: UIPickerView!
// Выбираем все места в базе данных
let places = realm.objects(Place.self)
var selectedPlace = Place()
func getSelectedPlace() -> Place {
return selectedPlace
}
//число "барабанов"
func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 }
//число элементов в "барабане"
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
//если БД пуста, то предупредить об этом
return places.count != 0 ? places.count : 1
}
//содержимое "барабанов"
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if (places.count != 0) {
if (places.count == 1) { return "Добавьте еще одно место" }
return places[row].userName
}
return "Сохраненных мест нет"
}
//обрабатываем выбранный элемент
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if (places.count != 0) {
print(picker.tag)
selectedPlace = places[row]
// print("выделена строка №\(row), элемент \(places[row])'")
}
}
func setup() { picker.delegate = self }
}
And
class TableForRouteViewController: UIViewController, UITableViewDataSource, UIPickerViewDelegate{
// Выбираем все места в базе данных
let places = realm.objects(Place.self)
#IBOutlet weak var makeTheRouteButton: UIBarButtonItem!
#IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.tableFooterView = UIView(frame: CGRect(x: 0, y: 0,
width: tableView.frame.size.width, height: 1))
tableView.dataSource = self
let cell = tableView.cellForRow(at: IndexPath(row: 0, section: 1)) as! PlaceForRouteCell
cell.picker.selectRow(1, inComponent: 0, animated: true)
var cellA = tableView.cellForRow(at: IndexPath(row: 0, section: 0)) as! PlaceForRouteCell {
didSet {
print("первая ячейка изменилось")
}
}
var cellB = tableView.cellForRow(at: IndexPath(row: 0, section: 1)) as! PlaceForRouteCell
// print("tag of A: \(cellA.picker)")
// print("tag of B: \(cellB.picker.tag)")
var valueOfA = cellA.getSelectedPlace() {
didSet {
print("значение в первой ячейке изменилось")
}
}
print(valueOfA.userName)
var valueOfB = cellB.getSelectedPlace() {
didSet {
print("значение в первой ячейке изменилось")
}
}
print(valueOfB.userName)
if (places.count < 2 ) { makeTheRouteButton.isEnabled = false }
}
#IBAction func makeTheRouteButtonPressed(_ sender: UIBarButtonItem) {
let cellA = tableView.cellForRow(at: IndexPath(row: 0, section: 0)) as! PlaceForRouteCell
let pointA = cellA.selectedPlace
let cellB = tableView.cellForRow(at: IndexPath(row: 0, section: 1)) as! PlaceForRouteCell
let pointB = cellB.selectedPlace
print("point A: \(pointA.userName), point B: \(pointB.userName)")
}
// var arePlacesEqual : Bool = comparing() {
// didSet {
// print("значения поменялись")
// }
// }
func comparing() -> Bool {
let cellA = tableView.cellForRow(at: IndexPath(row: 0, section: 0)) as! PlaceForRouteCell
let cellB = tableView.cellForRow(at: IndexPath(row: 0, section: 1)) as! PlaceForRouteCell
let valueOfA = cellA.selectedPlace.userName
let valueOfB = cellB.selectedPlace.userName
if (valueOfA == valueOfB) { return true }
return false
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return 1 }
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "placeForRouteCell", for: indexPath) as! PlaceForRouteCell
cell.picker.tag = indexPath[0]
cell.setup()
return cell
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
switch(section) {
case 0:return "Точка А"
case 1:return "Точка Б"
default :return ""
}
}
// количество секциий
func numberOfSections(in tableView: UITableView) -> Int { return 2 }
}

Answer 1

I created tableView with pickerView in cell.
In didSelectRow method i added NotificationCenter sender
My tableViewCell class:
let picker_array = ["one", "two", "three"]
class TableViewCell: UITableViewCell, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var picker: UIPickerView!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
self.picker.delegate = self
self.picker.dataSource = self
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return picker_array.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return "\(picker_array[row])"
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
NotificationCenter.default.post(name: Notification.Name("Notification"), object: nil)
}
}
In viewDidLoad i added NotificationCenter listener.
My ViewController class:
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
let dummy_data = [1,2]
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(methodOfReceivedNotification(notification:)), name: Notification.Name("Notification"), object: nil)
}
#objc func methodOfReceivedNotification(notification: Notification) {
for index in dummy_data {
let indexPath = IndexPath(row: index - 1, section: 0)
let cell = tableView.cellForRow(at: indexPath) as! TableViewCell
let selectRow = picker_array[cell.picker.selectedRow(inComponent: 0)]
print(selectRow)
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dummy_data.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell
return cell
}
}
When i change pickerView, console print current value from cells
I think it will help