Is it possible to have a single pickerView in swift which changes its value based on the button pressed. I could not figure out a way to implement more than one parameter through pickerView in a single ViewController. An alternative solution like a dropdown menu is fine too. Example/functional code would be great if provided. This is for a quiz app which would take multiple parameters.
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
#IBOutlet weak var pickerView: UIPickerView!
#IBOutlet weak var selectionBtn: UIButton!
let animals = ["Lion", "Dog", "Monkey", "Cat", "Bat"]
override func viewDidLoad() {
pickerView.isHidden = true
pickerView.delegate = self
pickerView.dataSource = self
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func selectPressed(_ sender: UIButton) {
if pickerView.isHidden {
pickerView.isHidden = false
}
}
public func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return animals.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return animals[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
selectionBtn.setTitle(animals[row], for: .normal)
pickerView.isHidden = true
}
}
Yes by having more than 1 data source
let animals1 = ["Lion", "Dog", "Monkey", "Cat", "Bat"]
let animals2 = ["Lion", "Dog", "Monkey", "Cat", "Bat"]
var mainData = [String]()
public func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return mainData.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, fo rComponent component: Int) -> String? {
return mainData[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
selectionBtn.setTitle(mainData[row], for: .normal)
pickerView.isHidden = true
}
assign mainData to say animal1
and reload
pickerView.reloadAllComponents()
Keep a separate array and put your array into it according to your logic. Use that array in pickerview. Try This:
let animals = ["Lion", "Dog", "Monkey", "Cat", "Bat"]
let secondAnimals = ["Lion1", "Dog1", "Monkey1", "Cat1", "Bat1"]
let pickerArray = [String]()
#IBAction func selectPressed(_ sender: UIButton) {
pickerArray = animals //change it according to your logic
pickerView.reloadAllComponents()
pickerView.isHidden = !pickerView.isHidden
}
public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerArray.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerArray[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
selectionBtn.setTitle(pickerArray[row], for: .normal)
pickerView.isHidden = true
}
You can have two arrays to populate the picker like this
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
if numb == 1
{
return firstArray.count
}
else
return secondArray.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if numb == 1
{
return firstArr[row]
}
else
{
return secondArr[row]
}
}
Whenever you have to change the data source for datepicker, make sure after that you are calling method
picker.reloadAllComponents()
Take flag and use appropriate data source.
let say you added 2 PickerView to your View
- set the 1st picker´s tag as 1 & 2 for the 2nd picker under the Attributes Inspector
- CTRL + drag from each picker to the top yellow View Controller icon and choose dataSource.Repeate the same choosing delegate
- repeate the above for the other picker too
- add pickerview & pickerviewdelegation to your ViewController class:
class ViewController: UIViewController,UIPickerViewDataSource,UIPickerViewDelegate {
in your ViewController class, create empty arrays for the pickers:
var picker1Options = []
var picker2Options = []
on viewDidLoad() method, populate the arrays with your content:
picker1Options = ["p1 1","p1 2","p1 3","p1 4","p1 5"]
picker2Options = ["p2 1","p2 2","p2 3","p2 4","p2 5"]
implement the delegate & pickerview methods:
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if (pickerView.tag == 1){
return picker1Options.count
}else{
return picker2Options.count
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
if (pickerView.tag == 1){
return "\(picker1Options[row])"
}else{
return "\(picker2Options[row])"
}
}
Hope this will help.
let arrAny : [String] = [String]()
button action:
#IBAction func btn2Pressed(_ sender: UIButton) {
arrAny = ["Lion1", "Dog1", "Monkey1", "Cat1", "Bat1"]
if pickerView.isHidden {
pickerView.isHidden = false
}
}
#IBAction func btn1Pressed(_ sender: UIButton) {
arrAny = ["Lion", "Dog", "Monkey", "Cat", "Bat"]
if pickerView.isHidden {
pickerView.isHidden = false
}
}
pickerView delegate:
public func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return arrAny.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return arrAny[row]
}
I have two pickerView and two Label on my ViewController.
The question is how I could connect labels to pickerView's data array (string type) and show in labels chosen pickerView cell?
#IBOutlet weak var valuetype1: UILabel!
var pickerData: [String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
self.picker1.delegate = self
self.picker1.dataSource = self
self.picker2.delegate = self
self.picker2.dataSource = self
pickerData = ["Годы", "Месяцы", "Недели", "Дни", "Часы", "Минуты"]
}
func numberOfComponents(in 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) {
valuetype1.text = pickerData[row]
valuetype2.text = pickerData[row]
}
How could you see I connected labels (valuetype(1..2)) to pickerData but it always show in both labels one String. I need to show in first label String chosen in pickerView1 and another string in second label, chosen in pickerView2.
UIPickerViewDelegate has a method called pickerView(_:didSelectRow:inComponent:). Add this method to your VC class. This method gets called whenever the user selects a row.
Your implementation should look somewhat similar to this.
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
valuetype1.text = pickerData[row]
}
For more information refer to the apple docs: https://developer.apple.com/documentation/uikit/uipickerviewdelegate/1614371-pickerview
EDIT:
When you are using the same controller as a delegate for multiple UIPickerViews, then you can check which picker view triggered the method call simply by comparing the pickerView argument on the pickerView(_:didSelectRow:inComponent:) method.
Try this:
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView == picker1 {
valuetype1.text = pickerData[row]
} else if pickerView == picker2 {
valuetype2.text = pickerData[row]
}
}
I want to know how to add interval value into UIDateTimePicker in swift
8am-8:30am
8:30am-9am
9am-9:30am
9:30am-10am
10am-10:30am
10:30am-11am
You can try something like this. Add one UIPickerView in your xib or your storyboard viewController after that set the delegate and datasoucre of that UIPickerView with your viewController. Now create one array of string like this.
var timeArr: [String] = [String]()
Now initialize this array in viewDidLoad like this
override func viewDidLoad() {
super.viewDidLoad()
self.timeArr = ["8:00AM - 8:30AM", "8:30AM - 9:00AM", "9:00AM - 9:30AM", "9:30AM - 10:00AM"]
}
Now add the delegate and datasource method of UIPicker in your ViewController like this
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return self.timeArr.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return self.timeArr[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print(self.timeArr[row])
}
This will create Picker that you want to select time.
I am trying to save the user's selection from UIPickerView to NSUserDefaults. I have found answers in obj-c but not swift. Here is my UIPickerView code:
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) {
race = pickerData[row]
}
And when you press a save button, it is supposed to save what is selected to NSUserDefaults. Here is my saving code:
#IBAction func save(sender: AnyObject) {
var defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(race, forKey: "race")
}
When I try to display the text on a label, it shows up blank:
override func viewDidLoad() {
super.viewDidLoad()
self.raceLabel.text = defaults.objectForKey("race") as? String
Let me know if my question needs any clarification, thanks.
Update your code as specified below and it will work
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
race = row
}
Every time you select a row, this function is called and the argument of the parameter row represents the row that was selected in your UIPickerView.
If you assign pickerData[row] value to race, you are assigning a value from your pickerData array at the index number represented by the row selected in your UIPickerView Object.
(Swift, Xcode6, iOS8, iPhone)
In my UIPickerView control, didSelectRow is not being called.
Yes, I have set Splash as the delegate (and datasource) for the picker.
Splash extends the UIViewController class
All the other functions work. No errors, the picker spins, has five rows, and displays the row number as defined in the other functions.
When does the didSelectRow method get called? Do I need to implement a Done button of some kind, or will this method fire when the user stops spinning? Do I need to implement a separate notification? tyvm :)
class Splash: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
#IBOutlet var countryPicker : UIPickerView = nil
func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int {
return 5
}
func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String {
return "\(row)"
}
func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, forComponent component: Int) -> Int {
println("Row: \(row)")
return row
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
You have the wrong signature, pickerView:didSelectRow:forComponent: returns void, not an integer. Try:
func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, forComponent component: Int) {
println("Row: \(row)")
}
Swift 4.2
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("selected row = \(row)") }