所以我有一个UIAlert和一个textField附加到它。当我在textField内部单击时，将显示pickerView，然后可以选择星期几。但是，当我从pickerView中选择任何一天时，textField仅在pickerView中显示第一个值，而当我选择其他值时不会更新。仍然会保存正确的选定值，并且会相应地更新tableView，但textField内部的文本不会更改。是因为它在警报中吗？
任何帮助将不胜感激。
import UIKit
import RealmSwift
class ViewController: UITableViewController, UITextFieldDelegate {
let realm = try! Realm()
var days : Results<Days>?
var workouts : Results<Workouts>?
var daysOfWeek : [String] = ["Monday", "Tuesday", "Wednsday", "Thursday", "Friday", "Saturday", "Sunday"]
var indexCheck : Int = 0
let picker = UIPickerView()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
picker.delegate = self
picker.dataSource = self
navigationItem.title = "Workouts"
navigationController?.navigationBar.prefersLargeTitles = true
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
let addBarButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addWorkout))
self.navigationItem.rightBarButtonItem = addBarButton
loadDays()
}
@objc func addWorkout() {
var textField1 = UITextField()
var textField2 = UITextField()
var containsDay = false
var counter = 0
textField1.delegate = self
textField2.delegate = self
let alert = UIAlertController(title: "New Workout", message: "Please name your workout...", preferredStyle: .alert)
let addAction = UIAlertAction(title: "Add Workout", style: .default) { (UIAlertAction) in
//Add day and workout to database
//if day exists, append workout to the existing day.
//if day doesn't exist, create a day and append workout to newly created day object.
//First, we have to create an initial days object...
//Need to check if ANY of the weekdays == picked day, only execute then.
if self.days?.isEmpty == false {
for i in 0...(self.days!.count - 1) {
if self.days?[i].weekday == self.daysOfWeek[self.picker.selectedRow(inComponent: 0)] {
containsDay = true
counter = i
break
}
}
if containsDay == true {
let newWorkout = Workouts()
newWorkout.title = textField2.text!
try! self.realm.write {
self.days?[counter].workout.append(newWorkout)
self.loadDays()
}
} else {
let dow = Days()
let newWorkout = Workouts()
dow.weekday = self.daysOfWeek[self.picker.selectedRow(inComponent: 0)]
newWorkout.title = textField2.text!
dow.workout.append(newWorkout)
self.save(newDay: dow)
}
} else {
let dow = Days()
let newWorkout = Workouts()
dow.weekday = self.daysOfWeek[self.picker.selectedRow(inComponent: 0)]
newWorkout.title = textField2.text!
dow.workout.append(newWorkout)
self.save(newDay: dow)
}
}
alert.addTextField { (alertTextField1) in
alertTextField1.placeholder = "Day of Week"
alertTextField1.text = self.daysOfWeek[self.picker.selectedRow(inComponent: 0)]
textField1 = alertTextField1
alertTextField1.inputView = self.picker
}
alert.addTextField { (alertTextField2) in
alertTextField2.placeholder = "Muscle Group"
textField2 = alertTextField2
alertTextField2.inputView = nil
}
alert.addAction(addAction)
present(alert, animated: true, completion: nil)
}
override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let label = UILabel()
label.text = days?[section].weekday ?? "Section Header"
label.backgroundColor = UIColor.lightGray
return label
}
override func numberOfSections(in tableView: UITableView) -> Int {
return days?.count ?? 0
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return days?[section].workout.count ?? 0
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let workout = days?[indexPath.section].workout[indexPath.row].title ?? "Workout"
cell.textLabel?.text = "\(workout) Section:\(indexPath.section) Row:\(indexPath.row)"
return cell
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
try! realm.write {
realm.delete((days?[indexPath.section].workout[indexPath.row])!)
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .automatic)
if days?[indexPath.section].workout.isEmpty == true {
realm.delete((days?[indexPath.section])!)
let indexSet = IndexSet(arrayLiteral: indexPath.section)
tableView.deleteSections(indexSet, with: .automatic)
}
tableView.endUpdates()
}
}
}
func loadDays() {
days = realm.objects(Days.self)
tableView.reloadData()
}
func save(newDay : Days) {
do {
try realm.write {
realm.add(newDay)
}
} catch {
print("Error saving day \(error)")
}
self.loadDays()
}
}
extension ViewController : UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 7
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return daysOfWeek[row]
}
}
将文本字段对象声明为全局对象，并使用PickerView的didSelectRow方法在选择的基础上更改文本字段的值。
例如：-
let picker = UIPickerView()
var textField1 = UITextField()
下一步，使用以下方法获取选择的值：-
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
textField1.text = daysOfWeek[row]
}
将两个文本文件对象都声明为全局对象
var textField1 = UITextField()
var textField2 = UITextField()
添加代码中更新的pickerview的委托方法：
extension ViewController : UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 7
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return daysOfWeek[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
textField1.text = daysOfWeek[row]
}
}