Why doesn't the view controller conform the UIPickerViewDataSource?
I have checked everything I could do to debug it from the web.
I have typed all the necessary functions for the protocols (Swift 3.1) but in vain.
Here is my code:
class SelectClassViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
let grades = ["7", "8", "9", "10", "11", "12"]
var selectCurrentGrade : String? = nil
#IBOutlet weak var Grade: UIPickerView!
#IBAction func Next(_ sender: Any) {
if selectCurrentGrade != nil {
performSegue(withIdentifier: "GradeToClass", sender: self)
}
}
#IBAction func Back(_ sender: Any) {
performSegue(withIdentifier: "GradeToMain", sender: self)
}
override func viewDidLoad() {
super.viewDidLoad()
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return grades[row]
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return grades.count
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
selectCurrentGrade = grades[row]
}
}
}
Your functions are inside viewDidLoad, move them outside and it'll work
Related
I am trying to set up 2 UIPickerViews in 1 view controller. I have not been able to find resources that solve my problem.
I have tried following the answer from Diavel Rider on How to use 2 UIPickerView's in one View Controller?. I got some errors from that. I have also tried adding tags but was not able to successfully do that. I am using Swift 4.
Here is the code of my view controller:
import UIKit
class FirstViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ foodTypeUIPickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
var countrows : Int = nutritionPickerData.count
if pickerView == foodTypeUIPickerView { **[Error Here: "Binary operator '==' cannot be applied to operands of type '_' and 'UIPickerView'"]**
countrows = self.foodTypePickerData.count
}
return countrows
}
func pickerView(_ foodTypeUIPickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == nutritionUIPickerView { **[Error Here: "Binary operator '==' cannot be applied to operands of type '_' and 'UIPickerView'"]**
let titleRow = nutritionPickerData[row]
return titleRow
} else if pickerView == foodTypeUIPickerView { **[Error Here: "Binary operator '==' cannot be applied to operands of type '_' and 'UIPickerView'"]**
let titleRow = foodTypePickerData[row]
return titleRow
}
return ""
}
#IBOutlet weak var nutritionUIPickerView: UIPickerView!
#IBOutlet weak var foodTypeUIPickerView: UIPickerView!
var nutritionPickerData = ["Protein", "Fiber", "Iron", "Fat", "Sodium", "Calcium/Vitamin D", "Energy", "Carbohydrates", "Cholestorol"]
var foodTypePickerData = ["Fruits", "Vegetables", "Legumes and Beans", "Grain", "Meat", "Dairy"]
#IBAction func submitUIButton(_ sender: Any) {
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.nutritionUIPickerView.delegate = self
self.nutritionUIPickerView.dataSource = self
self.foodTypeUIPickerView.delegate = self
self.foodTypeUIPickerView.dataSource = self
}
}
I need to use 2 picker views in 1 view controller. How do I do this?
You are referencing a non-existent variable named pickerView. You should update the parameter name to pickerView to avoid issues.
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView == foodTypeUIPickerView {
return self.foodTypePickerData.count
} else {
return self. nutritionPickerData.count
}
}
Make a similar change to the other delegate/data source methods.
You should separate your data sources and delegates and not put them inside your view controller. Set those as the delegate and datasource. Code written in swift 4.2 xcode 10.1
class ViewController: UIViewController {
#IBOutlet weak var foodPicker: UIPickerView!
#IBOutlet weak var nutritionPicker: UIPickerView!
var foodData = FoodData()
var nutritionData = NutritionData()
override func viewDidLoad() {
super.viewDidLoad()
foodPicker.delegate = foodData
foodPicker.dataSource = foodData
nutritionPicker.delegate = nutritionData
nutritionPicker.dataSource = nutritionData
}
#IBAction func actionButton(_ sender: UIButton) {
let food = foodPicker.delegate?.pickerView!(foodPicker, titleForRow: foodPicker.selectedRow(inComponent: 0), forComponent: 0)
let nutrition = nutritionPicker.delegate?.pickerView!(nutritionPicker, titleForRow: nutritionPicker.selectedRow(inComponent: 0), forComponent: 0)
print("You picked: \(food) and \(nutrition)")
}
}
class FoodData: NSObject, UIPickerViewDelegate, UIPickerViewDataSource {
var foodTypePickerData = ["Fruits", "Vegetables", "Legumes and Beans", "Grain", "Meat", "Dairy"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return foodTypePickerData.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return foodTypePickerData[row]
}
}
class NutritionData: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
var nutritionPickerData = ["Protein", "Fiber", "Iron", "Fat", "Sodium", "Calcium/Vitamin D", "Energy", "Carbohydrates", "Cholestorol"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return nutritionPickerData.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return nutritionPickerData[row]
}
}
I have a picker view and tableviews for each picker row programmed and I'd like to connect them via a UIButton. Any suggestions for a swift function to connect the Pickerview row with the botton to open that picker's table? (code below)
Thanks!
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var Picker1: UIPickerView!
var Array = ["G: Classroom friendly", "PG-13: Swear words OK(no sexual innuendo)", "R: Anything goes!"]
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
}
public func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
#IBAction func Submit(_ sender: Any) {
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
}
#IBAction func ContinueBotton(_ sender: UIButton) {
}
}
class ViewController1: UITableViewController {
#IBOutlet var ViewController1: UITableView!
var GRating = [GN]()
I'm trying to make drop-down list where picker view is not visible until user clicks on textfield. Then picker view disappears after user makes selection from pickerView. Currently, the picker View does not show up at all when I click on textfield.
import UIKit
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
#IBOutlet weak var textBox: UITextField!
#IBOutlet weak var pickerView: UIPickerView!
var choices = ["SortBy:", "Date(ascending)", "Date(descending)","Calories Burned(descending)","Duration(descending)"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
self.view.endEditing(true)
return choices[row]
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return choices.count
}
fun pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
self.textBox.text = self.choices[row]
self.pickerView.isHidden = true
print("hello")
}
func textFieldDidBeginEditing(TextField: UITextField){
if TextField == self.textBox {
self.pickerView.isHidden = false
TextField.endEditing(true)
}
}
override func viewDidLoad() {
self.pickerView.isHidden = true
super.viewDidLoad()
}
}
try this :
override func viewDidLoad() {
self.pickerView.isHidden = true
super.viewDidLoad()
self.textBox.delegate = self
self.pickerView.delegate = self
}
I'm trying to make items show up on my pickerView, I can't seem to figure out why its not showing up. Any Suggestions?
import UIKit
class InspectionViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var picker: UIPickerView!
var pickerData: [String] = [String]();
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
// Connect data:
self.picker.delegate = self;
self.picker.dataSource = self;
// Input data into the Array:
pickerData = ["53W4", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6"];
}
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]
}
/*
// 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.
}
*/
}
You should use this:
func pickerView(
_ pickerView: UIPickerView,
titleForRow row: Int,
forComponent component: Int
) -> String? {
pickerData[row]
}
instead of:
func pickerView(
pickerView: UIPickerView,
titleForRow row: Int,
forComponent component: Int
) -> String! {
pickerData[row]
}
The diff is in Omitting Argument Labels.
Here is a doc link
I've found some similar questions to this but none of the solutions matched my situation, and most were in objective-c which I don't know.
I'm trying to create a timer with minutes and seconds but I can't figure out how to wire up my second component.
How do I set up a second component with a UIPickerView?
This is what I have so far:
TimeViewController.swift
class TimeViewController: UIViewController, UIPickerViewDelegate {
#IBOutlet weak var timeSegueLabel: UILabel!
let minutes = Array(0...9)
let seconds = Array(0...59)
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return minutes.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
return String(minutes[row])
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
Thanks to #Bluehound for pointing me in the right direction. I had to look at some objective-c on GitHub to find out exactly how to do it, this is the answer I was looking for:
TimeViewController:
class TimeViewController: UIViewController, UIPickerViewDelegate {
#IBOutlet weak var timeSegueLabel: UILabel!
let minutes = Array(0...9)
let seconds = Array(0...59)
var recievedString: String = ""
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
//row = [repeatPickerView selectedRowInComponent:0];
var row = pickerView.selectedRowInComponent(0)
println("this is the pickerView\(row)")
if component == 0 {
return minutes.count
}
else {
return seconds.count
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
if component == 0 {
return String(minutes[row])
} else {
return String(seconds[row])
}
}
override func viewDidLoad() {
super.viewDidLoad()
timeSegueLabel.text = recievedString
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
This is the result:
Can do Picker with 2 components displaying in two labels
swift 4 xcode 9
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var lbl1: UILabel!
#IBOutlet weak var lbl2: UILabel!
#IBOutlet weak var picker1: UIPickerView!
var country = ["UK","US","JAPAN","UAE","CHINA","CANADA","EUROPE","IRAN","INDIA","ITALY" ]
var capital = [ "LONDON","WASHIGTON DC","TOKYO","ABU DHABI","BEIJING","OTTAWA","BRUSSELS","TEHRAN","NEW DELHI","ROME" ]
var val = 0
override func viewDidLoad() {
super.viewDidLoad()
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 {
return country.count
} else {
return capital.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == 0 {
return String(country[row])
} else {
return String(capital[row])
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == 0 {
lbl1.text = country[row]
} else {
lbl2.text = capital[row]
}
}
}