I am trying to navigate between two viewcontrollers using a UIPickerview, so i first learned how to use didSelectRow to change the title of a label and then i tried using some code to navigate to another viewcontroller but that didn't work.
The code that i used was:
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet var label: UILabel!
#IBOutlet var pickerView: UIPickerView!
var food = ["hello", "hi", "hey"]
var placementAnswer = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
pickerView.delegate = self
pickerView.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
public func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return food.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return food[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
placementAnswer = row
}
#IBAction func labelChanged(sender: UIButton) {
if (placementAnswer == 0){
}else if (placementAnswer == 1){
let view2 = self.storyboard?.instantiateViewControllerWithIdentifier("view2") as! ViewController2
self.navigationController?.pushViewController(view2, animated: true)
}else if (placementAnswer == 2){
}
}
}
As paranoidcoder pointed out I'm not sure your labelChanged method is getting called, which could be the problem with your existing code.
I'm assuming you want to change the view controller after a certain row is selected in the picker view. Putting the if statement to change views in didSelectRow would make the most sense in that case.
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
placementAnswer = row // unnecessary variable
if (placementAnswer == 0){}
else if (placementAnswer == 1)
{
let view2 = self.storyboard?.instantiateViewControllerWithIdentifier("view2") as! ViewController2
self.navigationController?.pushViewController(view2, animated: true)
}
else if (placementAnswer == 2) {}
}
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]
}
}
I am very new to swift Xcode and would like some help on UIPickerView.
I am trying to create two UIPickerViews, one called "From" and one called "To". "From" contains A, B and "To" contains B, C
Basically, if "From" is A and "To" is B then a Photo of car will appear on the same viewController.
if "From" is B and "To" is B then a photo of strawberry will appear and so on.
Can anyone give me any hints on how to do this? I've only managed to create the first UIPickerView.
import UIKit
class ViewController: UIViewController,UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet var Picker1:UIPickerView!
var Array = ["A","B","C"]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib
Picker1.delegate = self
Picker1.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return Array[row]
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return Array.count
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
}
var savedVal1 = "" as String
var savedVal2 = "" as String
var array1 = NSArray()
var array2 = NSArray()
override func viewDidLoad() {
super.viewDidLoad()
Picker1.delegate = self
Picker1.dataSource = self
Picker1.tag = 1
Picker2.delegate = self
Picker2.dataSource = self
Picker2.tag = 2
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView.tag == 1 {
return array1[row]
}
else{
return array2[row]
}
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView.tag == 1 {
return array1.count
}
else{
return array2.count
}
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{
return 1
}
func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int){
if pickerView.tag == 1 {
savedVal1 = array1[row]
// compare 2 values here & then take steps which fulfill your criteria.
}
else{
savedVal2 = array2[row]
//compare 2 values here & then take steps which fulfill your criteria.
}
}
Hope it helps.
Where is your PickerView2?
#IBOutlet var Picker2:UIPickerView!
In viewdidload load as you done
Picker1.delegate = self
Picker1.dataSource = self
If you are using same data source or different please check the picker view in UIPickerViewDelegate, UIPickerViewDataSource method like
If (Picker1) {
} else if (Picker2) {
}
I have a picker with two options currently, and what I am looking for is, based on the selection made in the picker, to determine the next viewController below is what I tried to use however, I immediately got an error stating the last "if" statement should be converted into a let statement. Below is the code for my picker and attempt to lead into associated segue.
import UIKit
import Firebase
import CoreData
import CoreLocation
class SchoolPickerViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
#IBOutlet weak var SchoolPicker: UIPickerView!
let pickerData = ["Ohio State University", "University of Rochester"]
override func viewDidLoad() {
super.viewDidLoad()
SchoolPicker.dataSource = self
SchoolPicker.delegate = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
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]
}
#IBAction func schoolSelectorGoButton(sender: AnyObject) {
if pickerData = "Ohio State University" {
performSegueWithIdentifier("ohioStateSelected", sender: sender)
}
if pickerData = "University of Rochester" {
performSegueWithIdentifier("rochesterSelected", sender: sender)
}
}
}
u should get selected picker data from Array
define
var selectedIndex = 0
then in this line
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
selectedIndex = row
return pickerData[row]
}
and in this action
#IBAction func schoolSelectorGoButton(sender: AnyObject) {
if pickerData[selectedIndex] == "Ohio State University" {
performSegueWithIdentifier("ohioStateSelected", sender: sender)
}
}
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)!)
}
How to navigate between two viewcontrollers using a UIPickerview
I am trying to navigate between two viewcontrollers using a UIPickerview, so i first learned how to use didSelectRow to change the title of a label and then i tried using some code to navigate to another viewcontroller but that didn't work.
The code that i used was:
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet var label: UILabel!
#IBOutlet var pickerView: UIPickerView!
var food = ["hello", "hi", "hey"]
var placementAnswer = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
pickerView.delegate = self
pickerView.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
public func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return food.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return food[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
placementAnswer = row
}
#IBAction func labelChanged(sender: UIButton) {
if (placementAnswer == 0){
}else if (placementAnswer == 1){
let view2 =
self.storyboard?.instantiateViewControllerWithIdentifier("view2") as! ViewController2
self.navigationController?.pushViewController(view2, animated: true)
}else if (placementAnswer == 2){
}
}
}