How can I change UIStepper value when changed from UITextField?

Question

I'm very new to all of this and I found some code that got me understanding some of this syntax. I'm trying to create a textfield that lets me type in a value that updates the stepper's value. The stepper currently works (updates the uitextfield) but when I change the value in the textfield it doesn't update the stepper's value, so when I click on the stepper, it reverts back to whatever value it was before I typed in a value... Can anyone tell me why the two functions STracksValueDidChange and CTrackValueDidChange have errors?

Here's my code so far:

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var STracks: UITextField!
@IBOutlet weak var STracksStepper: UIStepper!
@IBOutlet weak var CTracks: UITextField!
@IBOutlet weak var CTrackStepper: UIStepper!



override func viewDidLoad() {
    super.viewDidLoad()


    STracksStepper.autorepeat = true
    STracksStepper.maximumValue = 100.0
    STracksStepper.minimumValue = 2.0
    STracksStepper.stepValue = 2.0
    print(STracksStepper.value)
    STracks.text = "\(Int(STracksStepper.value))"
    STracksStepper.addTarget(self, action: "SstepperValueDidChange:", forControlEvents: .ValueChanged)
    STracks.addTarget(self, action: "STextValueDidChange:", forControlEvents: .ValueChanged)


    CTrackStepper.autorepeat = true
    CTrackStepper.maximumValue = 100.0
    CTrackStepper.minimumValue = 2.0
    CTrackStepper.stepValue = 2.0
    print(CTrackStepper.value)
    CTracks.text = "\(Int(CTrackStepper.value))"
    CTrackStepper.addTarget(self, action: "CstepperValueDidChange:", forControlEvents: .ValueChanged)
    CTracks.addTarget(self, action: "CTextValueDidChange:", forControlEvents: .ValueChanged)

}

//Steppers will update UITextFields
func SstepperValueDidChange(stepper: UIStepper) {

    let stepperMapping: [UIStepper: UITextField] = [STracksStepper: STracks]

    stepperMapping[stepper]!.text = "\(Int(stepper.value))"
}

func STracksValueDidChange(SText: UITextField) {

    let STextMapping: [UITextField: UIStepper] = [STracks: STracksStepper]

    STextMapping[SText]!.value = "(SText.text)"
}


func CstepperValueDidChange(stepper: UIStepper) {

    let stepperMapping: [UIStepper: UITextField] = [CTrackStepper: CTracks]

    stepperMapping[stepper]!.text = "\(Int(stepper.value))"
}


func CTrackValueDidChange(CText: UITextField) {

    let CTextMapping: [UITextField: UIStepper] = [CTracks: CTrackStepper]

    CTextMapping[CText]!.value = "(CText.text)"
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Answer 1

Try something like this.

CTrackStepper.value = Double(Textfield.text)

I am not so sure what the mapping is in your code.
But i don't think you need it for changing the value.

Update, made a project my self:

 import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var textfield: UITextField!
    @IBOutlet weak var stepper: UIStepper!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func stepperValueChanged(sender: UIStepper) {
        textfield.text = String(sender.value)
    }

    @IBAction func valueChanged(sender: UITextField) {
        if Double(sender.text!) != nil {
            stepper.value = Double(sender.text!)!
        }
    }
}

For steppervaluechanged and valuechanged just drag from uistepper and textfield and choose action and change the Anyobject to Uistepper of Uitextfield.

Good luck :)