How to use two UIPickerViews in one view controller?

Question

I have two UIPickerControllers in one view controller. I can get one to work, but when I add a second, my app crashes. Here is the code I use for one picker view:

import UIKit  class RegisterJobPosition: UIViewController, UIPickerViewDelegate {      @IBOutlet weak var positionLabel: UILabel!      var position = ["Lifeguard", "Instructor", "Supervisor"]      override func viewDidLoad() {         super.viewDidLoad()     }      func numberOfComponentsInPickerView(PickerView: UIPickerView!) -> Int     {         return 1     }      func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int     {         return position.count     }      func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!     {         return position[row]     }      func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {                 positionLabel.text = position[row]     } } 

Now, how can I get a second picker to work? Say my second picker view is called location (the other one is called position). I tried duplicating the code within the picker view methods for location but it doesn't work.

Answer 1

Here is my solution:

• in the storyboard, add two UIPickerView instances to your view
• set the first picker's tag as 1 and set 2 for the second picker under the "Attributes Inspector"
• control + drag from each picker to the top yellow view controller icon and choose dataSource. Repeat the same choosing delegate

• add UIPickerViewDataSource and UIPickerViewDelegate to your view controller:

  class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate { 

• in your view controller class, create empty arrays for the pickers:

  var picker1Options = [] var picker2Options = [] 

• In viewDidLoad(), populate the arrays with your content:

  picker1Options = ["Option 1","Option 2","Option 3","Option 4","Option 5"] picker2Options = ["Item 1","Item 2","Item 3","Item 4","Item 5"] 

• implement the delegate and data source 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])"     } }