UIPickerView multi components in swift

Question

I found this answer How do I setup a second component with a UIPickerView and it was helpful but I want to do more. I want to have the data of the second component dependent on the first. here is my code

class timerScreen: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
// where all the outlets are setup
@IBOutlet weak var pickerViewOutlet: UIPickerView!
// where I try to set up all my variables and constants
let cubesToWorkWith = ["3X3", "2X2", "4X4", "5X5", "6X6", "7X7", "Skewb", "Square-One"]
let firstArray = ["cross", "OLL", "Pll", "Corners", "Edges"]
let SecondArray = ["OLL" "Pll"]

// where the picker view is set up.
func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 2
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return cubesToWorkWith.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return cubesToWorkWith[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    cubeSelected = Int16(row)
}


}

I want the firstArray to be displayed in the second component if the "3X3" is currently selected in the first component and the secondArray if the "2X2" is selected. How would you do that? thanks for any help in advance!!!

Answer 1

Try do like this. I dont know what you exactly want. But it seems you want to reload the components on row selection of first component. If this is the requirement then this code will work.

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 cubesToWorkWith.count
    }
    else {
        return firstArray.count
    }
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {

    if component == 0 {
        return cubesToWorkWith[row]
    } else {
        return getArrayForRow(row)[row]
    }
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 
     if component == 0 {
          pickerView.reloadComponent(1)
     }
}

func getArrayForRow(row: Int) -> [String] {
    switch row { // check if 2*2 0r 3*3 
    case 0:
        return firstArray
    case 1:
        return secondArray
    // and so on...
    default:
        return []
    } 
}