我正在尝试创建一个表单，其中每个文本字段都有一个 UIPickerView，用户可以使用它来选择所需的选项。我需要为每个文本字段使用不同的信息数组，但我似乎无法让它工作，而且我已经坚持了很长一段时间了。
我有一个可能有效的方法，但由于每个字段具有相同的名称，因此我无法从 Firebase 的文本字段中检索数据。
这是到目前为止我的代码，这是我尝试过的最新方法，但不起作用:
import UIKit
import Firebase
import FirebaseDatabase
class CreatePostViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, UITextFieldDelegate {
@IBOutlet weak var gameTextField: UITextField!
@IBOutlet weak var activityTextField: UITextField!
@IBOutlet weak var consoleTextField: UITextField!
@IBOutlet weak var skillTextField: UITextField!
@IBOutlet weak var communicationTextField: UITextField!
@IBOutlet weak var lfglfmTextField: UITextField!
@IBOutlet weak var rulesTextView: UITextView!
@IBOutlet weak var descriptionTextView: UITextView!
var games = ["Assassin's Creed Origins", "Battlefield 1", "Call of Duty: Advanced Warfare", "Call of Duty: Black Ops III", "Call of Duty: Ghosts", "Call of Duty: Infinite Warfare", "Call of Duty: Modern Warfare Remastered", "Call of Duty: WWII", "Destiny", "Destiny 2", "Fifa 16", "Fifa 17", "Fifa 18", "Rocket League"]
var console = ["Xbox One", "Xbox 360", "Playstation 4", "Playstation 3"]
var skill = ["Achiever", "Explorer", "Killer", "Socializer"]
var communication = ["Mic", "No Mic"]
var lfglfm = ["LFG", "LFM"]
var itemSelected = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//remove margin / padding from textview
self.rulesTextView.textContainerInset = .zero
self.rulesTextView.contentInset = UIEdgeInsetsMake(0, -5, 0, 0)
// self.descriptionTextView.textContainerInset = .zero
// self.descriptionTextView.contentInset = UIEdgeInsetsMake(0, -5, 0, 0)
//allow tap on screen to remove text field input from screen
self.view.addGestureRecognizer(UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:))))
//UIPICKER
let pickerView = UIPickerView()
pickerView.delegate = self
pickerView.dataSource = self
gameTextField.inputView = pickerView
consoleTextField.inputView = pickerView
skillTextField.inputView = pickerView
communicationTextField.inputView = pickerView
lfglfmTextField.inputView = pickerView
updatePicker()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//update pickerView
func updatePicker(){
let pickerView = UIPickerView()
pickerView.reloadAllComponents()
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if gameTextField.isFirstResponder{
return games.count
}else if consoleTextField.isFirstResponder{
return console.count
}else if skillTextField.isFirstResponder{
return skill.count
}else if communicationTextField.isFirstResponder{
return communication.count
}else if lfglfmTextField.isFirstResponder{
return lfglfm.count
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
if gameTextField.isFirstResponder{
return games[row]
}else if consoleTextField.isFirstResponder{
return console[row]
}else if skillTextField.isFirstResponder{
return skill[row]
}else if communicationTextField.isFirstResponder{
return communication[row]
}else if lfglfmTextField.isFirstResponder{
return lfglfm[row]
}
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if gameTextField.isFirstResponder{
let itemselected = games[row]
gameTextField.text = itemselected
}else if consoleTextField.isFirstResponder{
let itemselected = console[row]
consoleTextField.text = itemselected
}else if skillTextField.isFirstResponder{
let itemselected = skill[row]
skillTextField.text = itemselected
}else if communicationTextField.isFirstResponder{
let itemselected = communication[row]
communicationTextField.text = itemselected
}else if lfglfmTextField.isFirstResponder{
let itemselected = lfglfm[row]
lfglfmTextField.text = itemselected
}
}
@IBAction func createPostTapped(_ sender: UIButton) {
if let uid = Auth.auth().currentUser?.uid {
Database.database().reference().child("usernames").child(uid).observeSingleEvent(of: .value, with: {
(snapshot) in
if let userDictionary = snapshot.value as? [String: AnyObject] {
for user in userDictionary {
if let username = user.value as? String {
if let game = self.gameTextField.text {
if let activity = self.activityTextField.text {
if let console = self.consoleTextField.text {
if let skill = self.skillTextField.text {
if let communication = self.communicationTextField.text {
if let lfglfm = self.lfglfmTextField.text {
if let description = self.descriptionTextView.text {
let postObject: Dictionary<String, Any> = [
"uid" : uid,
"username" : username,
"game" : game,
"activity" : activity,
"console" : console,
"skill" : skill,
"communication" : communication,
"lfglfm" : lfglfm,
"description" : description
]
Database.database().reference().child("posts").childByAutoId().setValue(postObject)
let alert = UIAlertController(title: "Success!", message: "Your post was added successfully.", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
//code will run when ok button is pressed
let vc = self.storyboard?.instantiateViewController(withIdentifier: "LoggedInVC")
self.present(vc!, animated: true, completion: nil)
}))
self.present(alert, animated: true, completion: nil)
}
}
}
}
}
}
}
}
}
}
})
}
}
/*
// 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.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
如果有人知道我可以实现的成功方法，请随时贡献，我们将不胜感激。
谢谢。
最佳答案
你的代码几乎是正确的。我只会使用 UIPickerView 存储一个类属性，以便您可以在文本字段编辑状态更改时重新加载组件。为此，您还必须设置 textField 委托(delegate)。
这是一个工作示例，其中包含我刚刚评论的调整:
import UIKit
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, UITextFieldDelegate {
@IBOutlet weak var gameTextField: UITextField!
@IBOutlet weak var activityTextField: UITextField!
@IBOutlet weak var consoleTextField: UITextField!
@IBOutlet weak var skillTextField: UITextField!
@IBOutlet weak var communicationTextField: UITextField!
@IBOutlet weak var lfglfmTextField: UITextField!
var games = ["Assassin's Creed Origins", "Battlefield 1", "Call of Duty: Advanced Warfare", "Call of Duty: Black Ops III", "Call of Duty: Ghosts", "Call of Duty: Infinite Warfare", "Call of Duty: Modern Warfare Remastered", "Call of Duty: WWII", "Destiny", "Destiny 2", "Fifa 16", "Fifa 17", "Fifa 18", "Rocket League"]
var console = ["Xbox One", "Xbox 360", "Playstation 4", "Playstation 3"]
var skill = ["Achiever", "Explorer", "Killer", "Socializer"]
var communication = ["Mic", "No Mic"]
var lfglfm = ["LFG", "LFM"]
var itemSelected = ""
weak var pickerView: UIPickerView?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//remove margin / padding from textview
// self.descriptionTextView.textContainerInset = .zero
// self.descriptionTextView.contentInset = UIEdgeInsetsMake(0, -5, 0, 0)
//allow tap on screen to remove text field input from screen
self.view.addGestureRecognizer(UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:))))
//UIPICKER
let pickerView = UIPickerView()
pickerView.delegate = self
pickerView.dataSource = self
gameTextField.delegate = self
consoleTextField.delegate = self
skillTextField.delegate = self
communicationTextField.delegate = self
lfglfmTextField.delegate = self
gameTextField.inputView = pickerView
consoleTextField.inputView = pickerView
skillTextField.inputView = pickerView
communicationTextField.inputView = pickerView
lfglfmTextField.inputView = pickerView
//It is important that goes after de inputView assignation
self.pickerView = pickerView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func textFieldDidBeginEditing(_ textField: UITextField) {
self.pickerView?.reloadAllComponents()
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if gameTextField.isFirstResponder{
return games.count
}else if consoleTextField.isFirstResponder{
return console.count
}else if skillTextField.isFirstResponder{
return skill.count
}else if communicationTextField.isFirstResponder{
return communication.count
}else if lfglfmTextField.isFirstResponder{
return lfglfm.count
}
return 0
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if gameTextField.isFirstResponder{
return games[row]
}else if consoleTextField.isFirstResponder{
return console[row]
}else if skillTextField.isFirstResponder{
return skill[row]
}else if communicationTextField.isFirstResponder{
return communication[row]
}else if lfglfmTextField.isFirstResponder{
return lfglfm[row]
}
return nil
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if gameTextField.isFirstResponder{
let itemselected = games[row]
gameTextField.text = itemselected
}else if consoleTextField.isFirstResponder{
let itemselected = console[row]
consoleTextField.text = itemselected
}else if skillTextField.isFirstResponder{
let itemselected = skill[row]
skillTextField.text = itemselected
}else if communicationTextField.isFirstResponder{
let itemselected = communication[row]
communicationTextField.text = itemselected
}else if lfglfmTextField.isFirstResponder{
let itemselected = lfglfm[row]
lfglfmTextField.text = itemselected
}
}
/*
// 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.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
已编辑:
您不需要 updatePicker 方法。它确实什么也没做。
为了这个简单示例的目的，我删除了 createPostTapped 方法。
关于ios - UIPickerView 用于具有不同数组的每个文本字段(Swift/Firebase)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55583430/