Calculations with UIPickerView and UITextField - swift

Question

I am working on an app where the user inputs a textfield value and it is multiplied by a value stored in UIPickerView's didSelectRow method. This is currently working but only when I enter the value and touch/select the picker. How can I have the calculation performed against the selected row as soon as the value is entered into the textfield? Thanks.
class Example2ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {
#IBOutlet weak var inputField: UITextField!
#IBOutlet weak var resultsLabel: UILabel!
#IBOutlet weak var calcLabel: UILabel!
#IBOutlet weak var myPicker: UIPickerView!
var pickerData: [String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
myPicker.delegate = self
myPicker.dataSource = self
self.resultsLabel.text = ""
self.calcLabel.text = ""
pickerData = ["Item 1", "Item 2", "Item 3","Item 4", "Item 5", "Item 6"]
myPicker.selectRow(1, inComponent: 0, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
print(string)
return true
}
#IBAction func editingChanged(sender: UITextField) {
sender.text = sender.text?.uppercaseString
inputField.text = sender.text
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?){
view.endEditing(true)
super.touchesBegan(touches, withEvent: event)
}
//UI Pickerview
// The number of columns of data
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
// The number of rows of data
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerData.count
}
// The data to return for the row and component (column) that's being passed in
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerData[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
var multiplicator : Double = 1.0
if (row == 0)
{
resultsLabel.text = "Item 1"
multiplicator = 1.00
}
else if (row == 1)
{
resultsLabel.text = "Item 2"
multiplicator = 2.00
}
else if (row == 2)
{
resultsLabel.text = "Item 3"
multiplicator = 3.00
}
else if (row == 3)
{
resultsLabel.text = "Item 4"
multiplicator = 4.00
}
else if (row == 4)
{
resultsLabel.text = "Item 5"
multiplicator = 5.00
}
else if (row == 5)
{
resultsLabel.text = "Item 6"
multiplicator = 6.00
}
let result = multiplicator * (inputField.text! as NSString).doubleValue
calcLabel.text = "Results: \(result)"
}
}

Answer 1

I have tried something more simple. I made an #IBAction call of the UItextField when edit is done and then I make all my post picker selection there.
#IBAction func textField_pickerAction(_ sender: Any) {
let row = picker.selectedRow(inComponent: 0)
...
...
...
}

Answer 2

You can do this by making multiplicator a global var and then you can use it inside the textfield function:
var multiplicator:Double!
#IBAction func editingChanged(sender: UITextField) {
sender.text = sender.text?.uppercaseString
inputField.text = sender.text
let result = multiplicator * (inputField.text! as NSString).doubleValue
calcLabel.text = "Results: \(result)"
}
You can now obviously remove the last 2 lines of code inside the pickerview func

Answer 3

In addition to the global var, I got this working by adding the UIPickerView if statement to it's own function. Now I can call that anywhere I need to.
I'm am updating the calcLabel in real time from the inputField using this:
inputField.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
func textFieldDidChange(textField: UITextField) {
pickerFunc()
}