please forgive my ignorance. I am learning from near scratch.
I'm trying to populate multiple pickerView instances based on the selection of a pickerView at the top of the view. I want the choices shown in the remaining pickerviews to depend on what item has been selected in the first pickerview.
I have 6 pickerViews in total. the 1st makes the general selection I want to base the remainder on.
Pickerview1 has 4 components. If the user selects component 4, all remaining pickerViews to show choices. If the user selects component 2 or 3, I want pickerView 4 and 5 to display N/A while the others show choices. If the user selects component 1, I want pickerViews 3-5 to display N/A while 1-2 show choices.
I assume to do this, I would need the index value of the selected component in pickerView1 to make an if else statement for the func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent etc.
I found selectedRow(inComponent:) in the documentation but have not been able to find working examples of how to implement it in my case.
Attached are some snips of my code so far: import UIKit
class FirstViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource { func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 }
var capacities = ["6","9","12","15","18","24"]
var notUsed = "N/A"
var oduList = ["MXZ-2C20", "MXZ-3C24", "MXZ-3C30", "MXZ-5C42"]
var result:Float = 0.0
var one4num:Float = 1.0
var factor:Float = 1.08
var per5ft:Float = 5
var factory:Float = 98
var selectedRow = 1
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
selectedRow = pickerView.selectedRow(inComponent: index)
if pickerView == oduPicker {
return oduList.count
}
else if pickerView == idu1PickerView {
return capacities.count
}
else if pickerView == idu2PickerView {
return capacities.count
}
else if pickerView == idu3PickerView {
return capacities.count
}
else if pickerView == idu4PickerView {
return capacities.count
}
else {
return capacities.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == oduPicker {
return oduList[row]
}
else if pickerView == idu1PickerView {
return capacities[row]
}
else if pickerView == idu2PickerView {
return capacities[row]
}
else {
return capacities[row]
}
}
@IBOutlet weak var oduPicker: UIPickerView!
@IBOutlet weak var idu1PickerView: UIPickerView!
@IBOutlet weak var idu2PickerView: UIPickerView!
@IBOutlet weak var idu3PickerView: UIPickerView!
@IBOutlet weak var idu4PickerView: UIPickerView!
@IBOutlet weak var idu5PickerView: UIPickerView!
@IBOutlet weak var one4Label: UILabel!
@IBOutlet weak var one4Slider: UISlider!
@IBOutlet weak var output: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.oduPicker.delegate = self
self.oduPicker.dataSource = self
self.idu1PickerView.delegate = self
self.idu1PickerView.dataSource = self
self.idu2PickerView.delegate = self
self.idu2PickerView.dataSource = self
self.idu3PickerView.delegate = self
self.idu3PickerView.dataSource = self
}
@IBAction func one4Slider(_ sender: Any) {
one4Label.text = "\(one4Slider.value)"
}
@IBAction func three8Slider(_ sender: Any) {
three8Label.text = "\(three8Slider.value)"
}
@IBAction func calculateButton(_ sender: Any) {
result = factor*(one4num-factory)/per5ft
output.text = "\(result)"
}
}
If I implement the suggestion this way:
import UIKit
class FirstViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
var capacities = ["6","9","12","15","18","24"]
var notUsed = ["N/A"]
var oduList = ["MXZ-2C20", "MXZ-3C24", "MXZ-3C30", "MXZ-5C42"]
var result:Float = 0.0
var one4num:Float = 1.0
var factor:Float = 1.08
var per5ft:Float = 5
var factory:Float = 98
var rowSelected: Int?
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView == oduPicker{
self.rowSelected = row
// make anything
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView == oduPicker {
return oduList.count
}
else if pickerView == idu1PickerView {
return capacities.count
}
else if pickerView == idu2PickerView {
return capacities.count
}
else if pickerView == idu3PickerView {
if rowSelected! < 2 {
return 1
}
else {
return capacities.count
}
}
else if pickerView == idu4PickerView {
if rowSelected! < 3 {
return 1
}
else {
return capacities.count
}
}
else {
if rowSelected! < 4 {
return 1
}
else {
return capacities.count
}
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == oduPicker {
return oduList[row]
}
else if pickerView == idu1PickerView {
return capacities[row]
}
else if pickerView == idu2PickerView {
return capacities[row]
}
else if pickerView == idu3PickerView {
if rowSelected! < 2 {
return notUsed[row]
}
else {
return capacities[row]
}
}
else if pickerView == idu4PickerView {
if rowSelected! < 3 {
return notUsed[row]
}
else {
return capacities[row]
}
}
else if pickerView == idu5PickerView {
if rowSelected! < 4 {
return notUsed[row]
}
else {
return capacities[row]
}
}
else {
return capacities[row]
}
}
@IBOutlet weak var oduPicker: UIPickerView!
@IBOutlet weak var idu1PickerView: UIPickerView!
@IBOutlet weak var idu2PickerView: UIPickerView!
@IBOutlet weak var idu3PickerView: UIPickerView!
@IBOutlet weak var idu4PickerView: UIPickerView!
@IBOutlet weak var idu5PickerView: UIPickerView!
@IBOutlet weak var one4Label: UILabel!
@IBOutlet weak var one4Slider: UISlider!
@IBOutlet weak var output: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.oduPicker.delegate = self
self.oduPicker.dataSource = self
self.idu1PickerView.delegate = self
self.idu1PickerView.dataSource = self
self.idu2PickerView.delegate = self
self.idu2PickerView.dataSource = self
self.idu3PickerView.delegate = self
self.idu3PickerView.dataSource = self
self.idu4PickerView.delegate = self
self.idu4PickerView.dataSource = self
self.idu5PickerView.delegate = self
self.idu5PickerView.dataSource = self
}
@IBAction func one4Slider(_ sender: Any) {
one4Label.text = "\(one4Slider.value)"
}
@IBAction func calculateButton(_ sender: Any) {
result = factor*(one4num-factory)/per5ft
output.text = "\(result)"
}
}
The code breaks the "FirstViewController" and seems to invalidate the "numberOfRows" and "titleForRows" statements as well as a cascade of errors below that.
If i implement after those two functions:
else {
return capacities[row]
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView == oduPicker{
self.rowSelected = row
// make anything
}
@IBOutlet weak var oduPicker: UIPickerView!
@IBOutlet weak var idu1PickerView: UIPickerView!
@IBOutlet weak var idu2PickerView: UIPickerView!
@IBOutlet weak var idu3PickerView: UIPickerView!
@IBOutlet weak var idu4PickerView: UIPickerView!
@IBOutlet weak var idu5PickerView: UIPickerView!
It breaks all the pickerView variables like oduPicker etc.
If I try to bring the statement into the 1st function as such:
var rowSelected: Int?
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, numberOfRowsInComponent component: Int) -> Int {
if pickerView == oduPicker {
self.rowSelected = row
return oduList.count
}
else if pickerView == idu1PickerView {
return capacities.count
}...
It again breaks the "FirstViewController" with the error "Type 'FirstViewController' does not conform to protocol 'UIPickerViewDataSource'"
I'm also forced to put a "!" after "rowSelected" for wrapping/unwrapping. I'm not sure if what this means or if it's important at the moment.
Update:
If I implement per Samuel's suggestion as such:
import UIKit
class FirstViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource { func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 }
var capacities = ["6","9","12","15","18","24"]
var notUsed = ["N/A"]
var oduList = ["MXZ-2C20", "MXZ-3C24", "MXZ-3C30", "MXZ-5C42"]
var result:Float = 0.0
var one4num:Float = 1.0
var factor:Float = 1.08
var per5ft:Float = 5
var factory:Float = 98
var selectedRow = 1
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
selectedRow = pickerView.selectedRow(inComponent: index)
if pickerView == oduPicker {
return oduList.count
}
else if pickerView == idu1PickerView {
return capacities.count
}
else if pickerView == idu2PickerView {
return capacities.count
}
else if pickerView == idu3PickerView {
if selectedRow < 2 {
return 1
}
else {
return capacities.count
}
}
else if pickerView == idu4PickerView {
if selectedRow < 3 {
return 1
}
else {
return capacities.count
}
}
else {
if selectedRow < 4 {
return 1
}
else {
return capacities.count
}
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == oduPicker {
return oduList[row]
}
else if pickerView == idu1PickerView {
return capacities[row]
}
else if pickerView == idu2PickerView {
return capacities[row]
}
else if pickerView == idu3PickerView {
if selectedRow < 2 {
return notUsed[row]
}
else {
return capacities[row]
}
}
else if pickerView == idu4PickerView {
if selectedRow < 3 {
return notUsed[row]
}
else {
return capacities[row]
}
}
else if pickerView == idu5PickerView {
if selectedRow < 4 {
return notUsed[row]
}
else {
return capacities[row]
}
}
else {
return capacities[row]
}
}
@IBOutlet weak var oduPicker: UIPickerView!
@IBOutlet weak var idu1PickerView: UIPickerView!
@IBOutlet weak var idu2PickerView: UIPickerView!
@IBOutlet weak var idu3PickerView: UIPickerView!
@IBOutlet weak var idu4PickerView: UIPickerView!
@IBOutlet weak var idu5PickerView: UIPickerView!
@IBOutlet weak var one4Label: UILabel!
@IBOutlet weak var one4Slider: UISlider!
@IBOutlet weak var output: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.oduPicker.delegate = self
self.oduPicker.dataSource = self
self.idu1PickerView.delegate = self
self.idu1PickerView.dataSource = self
self.idu2PickerView.delegate = self
self.idu2PickerView.dataSource = self
self.idu3PickerView.delegate = self
self.idu3PickerView.dataSource = self
self.idu4PickerView.delegate = self
self.idu4PickerView.dataSource = self
self.idu5PickerView.delegate = self
self.idu5PickerView.dataSource = self
}
@IBAction func one4Slider(_ sender: Any) {
one4Label.text = "\(one4Slider.value)"
}
@IBAction func calculateButton(_ sender: Any) {
result = factor*(one4num-factory)/per5ft
output.text = "\(result)"
}
}
I get an error after the line:
selectedRow = pickerView.selectedRow(inComponent: index)
"Cannot convert value of type '(Any) -> Int' to expected argument type 'Int'"
UIPickerViewDelegateand its methods. – rmaddy