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list of countries into uipickerview swift 3
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When I us the following code is only see question marks in the PickerView.
I can't find the mistake.
import UIKit
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
#IBOutlet weak var dbPicker: UIPickerView!
var dbPickerData: [String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//Connect Data:
self.dbPicker.dataSource = self
self.dbPicker.delegate = self
// Fill dbPicker content
dbPickerData = ["White","Red","Green","Blue"]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// The number of columns of data
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1;
}
// The number of rows of data
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return dbPickerData.count;
}
// The data to return for the row and component (column) that's being passed in
private func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return dbPickerData[row];
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
if(row == 0)
{
self.view.backgroundColor = UIColor.white;
}
else if(row == 1)
{
self.view.backgroundColor = UIColor.red;
}
else if(row == 2)
{
self.view.backgroundColor = UIColor.green;
}
else
{
self.view.backgroundColor = UIColor.blue;
}
}
}
Instead of this
private func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return dbPickerData[row];
}
update it with this one
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
let str: String = dbPickerData[row]
return str
}
Hopes it will help...
Related
I am new with programming in Swift. i got problem when i want to show up 2 different picker with 2 different content. But it show (?) instead of content.
see the screenshoot below
Thank your for help!
let fruit = ["apple", "orange", "watermelon", "banana", "peach", "strawberry"]
let food = ["rice","bread","spagheti","milk"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if (pickerView.tag == 1) {
return fruit.count
}
else {
return food.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if (pickerView.tag == 1) {
return fruit[row]
}
else {
return food[row]
}
}
First of all check you pickerView DataSource and Delegate connected properly and then you can conditionally load data by comparing pickerView like below.
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView == YOUR_FIRST_PICKER {
return fruit.count
}
else {
return food.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == YOUR_FIRST_PICKER {
return fruit[row]
}
else {
return food[row]
}
}
I think you haven’t set your pickers’ delegates and data sources.
First add these protocols to your ViewController subclass
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource
then in viewDidLoad set delegates and data sources of your pickers as self
override func viewDidLoad() {
super.viewDidLoad()
pickerView1.delegate = self
pickerView1.dataSource = self
pickerView2.delegate = self
pickerView2.dataSource = self
}
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]
}
Here's my code. I would say the steps I have taken, but they just don't make sense and I'd get made fun of, I am very new to Swift and Xcode. But how do I declare a group of components? I thought I spaced them enough, I have honestly searched for guides, but no one really focuses on dropdowns and variables within the dropdowns.
import UIKit
class SecondViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var backBTN: UIButton!
#IBOutlet weak var label: UILabel!
#IBOutlet weak var labelTwo: UILabel!
#IBOutlet weak var pickerView: UIPickerView!
#IBOutlet weak var pickerviewTwo: UIPickerView!
var pickerData = ["X", "Y"]
var pickerdataTwo = ["R","D","C"]
override func viewDidLoad() {
super.viewDidLoad()
pickerView.delegate = self
pickerView.dataSource = self
pickerviewTwo.delegate = self
pickerviewTwo.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
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) {
label.text = pickerData[row]
}
func numberOfComponents(in pickerviewTwo: UIPickerView) -> Int {
return 1
}
func pickerviewTwo(_ pickerviewTwo: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerdataTwo.count
}
func pickerviewTwo(_ pickerviewTwo: UIPickerView, titleForRow row: Int, forComponent
component: Int) -> String? {
return pickerdataTwo[row]
}
func pickerviewTwo(_ pickerviewTwo: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
labelTwo.text = pickerdataTwo[row]
}
}
Your picker view code is wrong. First, I would recommend changing the names of them from pickerView and pickerViewTwo to something more descriptive.
The required functions for picker view can't be used multiple times, thus you are getting the error. The proper way to do it is:
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent
component: Int) -> String? {
//After renaming the first pickerView to topPickerView
if pickerView == topPickerView {
return pickerData[row]
}
else {
return pickerDataTwo[row]
}
}
There should be an if-else in each of the required functions, with the if statement saying that if pickerView == oneOfThePickerViewsName, with the if else statement. Whats happening is when the pickers are being set up, it checks which picker it is and uses the code for that.
Here is how the rest should be formatted:
//pickerView has been renamed to topPickerView
func numberOfComponents(in pickerView: UIPickerView) -> Int {
//You wouldn't need to do this here as its the same for both of them.
//
if pickerView == topPickerView
{
return 1
}
else
{
return 1
}
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView == topPickerView
{
return pickerData.count
}
else
{
return pickerdataTwo.count
// should actually be formatted pickerDataTwo because of camelCase.
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent
component: Int) -> String? {
if pickerView == topPickerView
{
return pickerData[row]
}
else
{
return pickerdataTwo[row]
// should actually be formatted pickerDataTwo because of camelCase.
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent
component: Int) {
if pickerView == topPickerView
{
label.text = pickerData[row]
}
else
{
labelTwo.text = pickerdataTwo[row]
// should actually be formatted pickerDataTwo because of camelCase.
}
}
I need to give title for rows according to array but I don't know how to do this. I'm new to iOS.
class ViewController: UIViewController , UIPickerViewDelegate, UIPickerViewDataSource{
#IBOutlet weak var pickerView: UIPickerView!
#IBOutlet weak var label: UILabel!
var names: Array<String>?
var department: Array<String>?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
names = ["Vineeta", "Shubham" ,"Anand", "Vivek", "Akshay", "Harshit", "Vikas", "Prasoon", "Sunil"]
department = ["iOS","Angular", ".Net", "iOS","iOS", ".Net", "Android","Android", "Angular"]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 9
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == 0 {
[names o]
}
}
}
don't forget UIPickerViewDelegate,UIPickerViewDataSource
#IBOutlet weak var picker: UIPickerView!
override func viewDidLoad() {
super.viewDidLoad()
pickerData = ["X","Y"]
picker.delegate = self
picker.dataSource = self
}
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) {
let selectedText = pickerData[row]
}
Use this code -
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
if component == 0
{
return names?.count
}
else
{
return department?.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
if component == 0
{
return names?[row]
}
else
{
return department?[row]
}
}
I am new to programming, so please forgive the basic nature of this question.
I am trying to put multiple picker views into the same class, but they keep coming back with the same choices.
class ViewController: UIViewController, UIPickerViewDelegate{
#IBOutlet var outgoing: UIPickerView!
var var1=["1","2"]
var var2=["a","b"]
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func numberOfComponentsInPickerView(pickerView: UIPickerView!) ->Int{
return 2
}
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) ->Int {
return var1.count
}
func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int)->String!{
return var2[row]
}
Any suggestions?
For displaying two components you need to change your methods like:
func numberOfComponentsInPickerView(pickerView: UIPickerView!) ->Int
{
return 2
}
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) ->Int
{
var rows = var2.count
if component == 0
{
rows = var1.count
}
return rows;
}
func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int)->String!
{
var componentStr = var2[row]
if component == 0
{
componentStr = var1[row]
}
return componentStr;
}