We are trying to delete data from a UIPicker view upon selection, however, it is deleting only the first string "Select You're Time" upon election of any string in UIPicker. After going back, "Select You're Time" is also reloaded. The reload function is required otherwise our code doesn't delete anything.
import Foundation
import UIKit
import Firebase
import FirebaseDatabase
class timeSinglesViewController:UIViewController,UIPickerViewDataSource,UIPickerViewDelegate {
#IBOutlet weak var myPicker: UIPickerView!
#IBOutlet weak var myLabel: UITextField!
var pickerData = ["Select You're Time","6:30", "7:30", "8:30", "9:30", "10:30", "11:30", "12:30", "1:30", "2:30", "3:30", "4:30", "5:30", "6:30", "7:30"]
override func viewDidLoad() {
super.viewDidLoad()
myPicker.dataSource = self
myPicker.delegate = self
myPicker.tag = 1
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerData.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerData[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
myLabel.text = pickerData[row]
}
#IBAction func postData(sender: AnyObject) {
let row = Int()
let ref = FIRDatabase.database().referenceFromURL("deleted url")
ref.child("Time").setValue(myLabel.text)
pickerData.removeAtIndex(row)
myPicker.reloadAllComponents()
}
}
Any thoughts are appreciated. Thank you!
Related
So far I have tried to use
func pickerView1(_ helpTypePicker: UIPickerView, didSelectRow row: Int, inComponent component: Int {
infoListInit.requestInfoList[4] = (helpTypePickerValues[row])
}
But the value is just not saving to the array. I tried printing the value after saving it, but to no avail. I do have helpTypePicker as a self delegate in my viewDidLoad func, so I don't know where to go from here. Other text values from UITextFields save fine, but none of my UIPickerViews are working in this regard
Here is the full class:
import Foundation
import UIKit
class requestHelpTypePickerScreen: UIViewController,
UIPickerViewDataSource, UIPickerViewDelegate {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent
component: Int) -> Int {
if pickerView.tag == 1 {
return helpTypePickerValues.count
} else {
return languagePickerValues.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView.tag == 1 {
return "\(helpTypePickerValues[row])"
} else {
return "\(languagePickerValues[row])"
}
}
// Mark: outlets
#IBOutlet weak var helpTypePicker: UIPickerView!
#IBOutlet weak var languagePicker: UIPickerView!
#IBOutlet weak var helpTypePickerLabel: UILabel!
let helpTypePickerValues = ["Academic/Professional", "Donate", "Food/Groceries", "Medication", "Emotional Support", "Misc."]
let languagePickerValues = ["Arabic", "Chinese", "Spanish", "English", "French", "Hindi/Urdu", "Korean", "Russian"]
override func viewDidLoad() {
super.viewDidLoad()
helpTypePicker.delegate = self
languagePicker.delegate = self
self.helpTypePicker.selectRow(2, inComponent: 0, animated: true)
self.languagePicker.selectRow(3, inComponent: 0, animated: true)
}
// Mark: actions
#IBAction func buttonPressed(_ sender: Any) {
func pickerView(_ helpTypePicker: UIPickerView,
didSelectRow row: Int,
inComponent component: Int) {
infoListInit.requestInfoList[5] = (helpTypePickerValues[row])
}
// this is called pickerView1 because it would conflict with the above
// function if called pickerView
func pickerView1(_ languagePicker: UIPickerView,
didSelectRow row1: Int,
inComponent component: Int) {
infoListInit.requestInfoList[6] = (languagePickerValues[row1])
}
performSegue(withIdentifier: "pickersDone", sender: nil)
}
There is a mistake in your code, the Delegate indicates that when a new row is selected in the UIPickerView, the function pickerView(_:didSelectRow:inComponent:) will be called (the argument name doesn't matter).
In your case in when any of the pickers select a new row pickerView(_:didSelectRow:inComponent:) is called with the picker passed as arguments in the firs position. You should check which picker was modified and then change your logic.
In your case:
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView == helpTypePicker {
infoListInit.requestInfoList[5] = helpTypePickerValues[row]
} else {
infoListInit.requestInfoList[6] = languagePickerValues[row]
}
}
In my searches, I see this is a common question but I've tried some of the solutions and haven't been able to resolve. A simple example below. When I run the app, and press button, 0 prints as expected. After pressing button2, then button, 1 prints, also as expected. If I move the picker, then press button, I expect 2, but still get 1.
I gather this is because ViewController().sample() is creating a copy, and not actually changing the variable in the "original" ViewController(). I'm stumped at what needs to be reconfigured to get the desired behavior.
import UIKit
class pickerHelper: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
let data: [String]
init(data: [String]) {
self.data = data
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
data.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
data[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
ViewController().sample()
}
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
p1.delegate = helper1
p1.dataSource = helper1
}
#IBOutlet weak var p1: UIPickerView!
let helper1 = pickerHelper(data:["a", "b", "c"])
var test = Int()
#IBAction func button(_ sender: Any) {
print(test)
}
#IBAction func button2(_ sender: Any) {
test = 1
}
func sample() {
test = 2
}
}
This is a situation where you would either use a delegation pattern or a callback closure; this latter is more "Swifty".
With delegation:
protocol PickerHelperDelegate {
func pickerHelper(_ helper: selectedRow row:)
}
Then in your PickerHelper you add a delegate property and invoke the delegate when required:
class PickerHelper: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
let data: [String]
var delegate: PickerHelperDelegate?
init(data: [String]) {
self.data = data
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
data.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
data[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
self.delegate?.pickerHelper(self, selectedRow: row)
}
}
In your view controller you need to assign the delegate and implement the protocol function:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
p1.delegate = helper1
p1.dataSource = helper1
helper1.delegate = self // Assign this object as the picker helper's delegate
}
#IBOutlet weak var p1: UIPickerView!
let helper1 = pickerHelper(data:["a", "b", "c"])
var test = Int()
}
extension ViewController: PickerHelperDelegate {
func pickerHelper(_ helper: PickerHelper, selectedRow row:Int) {
self.sample()
print("Selected row \(row)")
}
}
You can do a similar thing with a closure:
class PickerHelper: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
let data: [String]
var changeHandler: ((Int)->Void)?
init(data: [String]) {
self.data = data
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
data.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
data[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
self.changeHandler?(row)
}
}
In your view controller you need to assign a closure to the changeHandler property:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
p1.delegate = helper1
p1.dataSource = helper1
helper.changeHandler = { row in
self.sample()
print("Selected row \(row)")
}
}
You could also change your protocol or closure to pass back the data element rather than just the row number and use generics for your PickerHelper so that it wasn't just limited to strings.
Note that classes start with a capital by convention, so you should say PickerHelper, not pickerHelper.
You can use the static property to keep its state in class.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
p1.delegate = helper1
p1.dataSource = helper1
}
#IBOutlet weak var p1: UIPickerView!
let helper1 = pickerHelper(data:["a", "b", "c"])
static var test = Int()
#IBAction func button(_ sender: Any) {
print(test)
}
#IBAction func button2(_ sender: Any) {
ViewController.test = 1
}
static func sample() {
test = 2
}
}
this code makes me really mad. I already read thousands of tutorials and stack overflow comments....
Please help me. The Picker just contains a blank grey screen.
Code here:
GenderPickerModel.swift
import UIKit
class GenderPickerModel: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
let genderPickerData: [String] = ["male", "female"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1;
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return genderPickerData.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return genderPickerData[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
}
}
and used in a Controller:
#IBOutlet weak var gender: UITextField!
private var genderPickerView: UIPickerView?
override func viewDidLoad() {
super.viewDidLoad()
loadProfile()
prepareView()
}
func prepareView() {
genderPickerView = UIPickerView.init()
let gpModel = GenderPickerModel()
genderPickerView?.delegate = gpModel
genderPickerView?.dataSource = gpModel
gender.inputView = genderPickerView;
genderPickerView?.selectRow(0, inComponent: 0, animated: true)
genderPickerView?.reloadAllComponents()
}
First, you do not need to do the separate array of gender in pickerview class and you don't need to create the instance of pickerview.
From this, you can see your datasource in your custompickerview
/**
Controller code where you can create instantiate picker assign data
*/
class ViewController: UIViewController {
#IBOutlet weak var textField: UITextField!
let genderPickerData : [String] = ["male", "female"]
override func viewDidLoad() {
super.viewDidLoad()
prepareView()
}
func prepareView() {
genderPickerView = UIPickerView()
let gpModel = GenderPickerModel()
gpModel.data = genderPickerData
gpModel.dataSource = gpModel
gpModel.delegate = gpModel
textField.inputView = gpModel
}
}
/**
Custom pickerview class where you can handle data
*/
import UIKit
class GenderPickerModel: UIPickerView, UIPickerViewDataSource, UIPickerViewDelegate {
var data = [String]()
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return data.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return data[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
}
}
I am creating a booking app. I am using UIPickers to display open times. I have the pickers fully functional but am not sure how to delete booked times after a user has selected one from the choices provided. I am relatively new to Xcode, so any information is greatly appreciated!!
import Foundation
import UIKit
import Firebase
import FirebaseDatabase
class sTimeSelectionViewController:UIViewController,UIPickerViewDataSource,UIPickerViewDelegate {
#IBOutlet weak var myPicker: UIPickerView!
#IBOutlet weak var myLabel: UILabel!
let pickerData = ["9:30","10:30","11:30","12:30","1:30","2:30"]
override func viewDidLoad() {
super.viewDidLoad()
myPicker.dataSource = self
myPicker.delegate = self
myPicker.tag = 1
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerData.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerData[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
myLabel.text = pickerData[row]
}
#IBAction func postData(sender: AnyObject) {
let ref = FIRDatabase.database().referenceFromURL("deleted URL")
ref.child("Time").setValue(myLabel.text)
}
}
Thanks!
First change your pickerData declaration from constant to variable
var pickerData = ["9:30","10:30","11:30","12:30","1:30","2:30"].
Next you would need to remove the array element in your method didSelectRow after your myLabel.text code
pickerData.removeAtIndex(row)
and reload your picker
myPicker.reloadAllComponents()
I have a picker set up and want to have the user make a selection then tap a button which leads to a url. This is what I have so far:-
class PickerViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var picker: UIPickerView!
#IBOutlet weak var label: UILabel!
var url = NSURL(string: "http://www.google.com")
var pickerData: [String] = [String]()
var pickerSites: [String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
self.picker.delegate = self
self.picker.delegate = self
pickerData = ["Google", "Facebook"]
pickerSites = ["http://www.google.com", "http://www.facebook.com"]
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerData.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerData[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
label.text = pickerSites[row]
}
siteBtn.addTarget(self, action: "didTapSite", forControlEvents: .TouchUpInside)
#IBAction func sitesBtn(sender: AnyObject) {
UIApplication.shared().openURL(NSURL(string: "http://www.google.com")!)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I've connected the "siteBtn" to a button on the screen. The picker and text label were working fine until I added the code for the button. I'm not sure if I've put the button code in the correct place. I know that I need the button to connect with the picker "didSelectRow" and that the "pickerData" list needs to correlate to the "pickerSites" list but I'm stuck.
Any help would be much appreciated.
this is the minimal setup you need. feel free to ask if anything is unclear:
// outlet to the pickerview
#IBOutlet weak var picker: UIPickerView!
// datasource
let pickerData = ["Google", "Facebook"]
let pickerSites = ["http://www.google.com", "http://www.facebook.com"]
// pickerview datasource methods
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerData.count
}
// pickerview delegate method
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerData[row]
}
// ibaction for button tap
#IBAction func goToURLButtonTapped(sender: UIButton) {
let selectedSite = pickerSites[picker.selectedRowInComponent(0)]
UIApplication.sharedApplication().openURL(NSURL(string: selectedSite)!)
}