Swift: Button Enabling Not Working? - swift

Question

I have a button that is disabled in my view controller. I have IBActions for when two text fields are edited. I am trying to enable the button when two text fields both contain integers. I have tried to do this, but whenever I run the ios simulator, the button stays disabled even when I put integers into each text field. Why is it staying disabled? I am new to swift, so please help me out. Here is the code for my entire project:
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var calculatorButton: UIButton!
#IBOutlet weak var inspirationLabel: UILabel!
#IBOutlet weak var beginningLabel: UILabel!
#IBOutlet weak var calculatorContainer: UIView!
#IBOutlet weak var answer1Label: UILabel!
#IBOutlet weak var doneButton: UIButton!
#IBOutlet weak var yourWeightTextField: UITextField!
#IBOutlet weak var calorieNumberTextField: UITextField!
#IBOutlet weak var menuExampleButton: UIButton!
#IBOutlet weak var aboutButton: UIButton!
#IBOutlet weak var calculateButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib
yourWeightTextField.delegate = self
calorieNumberTextField.delegate = self
calculateButton.enabled = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func calculatorButtonTapped(sender: AnyObject) {
calculatorContainer.hidden = false
inspirationLabel.hidden = true
beginningLabel.hidden = true
menuExampleButton.hidden = true
aboutButton.hidden = true
}
#IBAction func yourWeightEditingDidEnd(sender: AnyObject) {
yourWeightTextField.resignFirstResponder()
}
#IBAction func calorieNumberEditingDidEnd(sender: AnyObject) {
calorieNumberTextField.resignFirstResponder()
}
var yourWeightFilled = false
var calorieNumberFilled = false
func yourWeightTextFieldValueValidInt(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Find out what the text field will be after adding the current edit
let text = (yourWeightTextField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
if let intVal = text.toInt() {
self.yourWeightFilled = true
} else {
self.yourWeightFilled = false
}
return true
}
func calorieNumberTextFieldValueValidInt(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Find out what the text field will be after adding the current edit
let text = (calorieNumberTextField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
if let intVal = text.toInt() {
self.calorieNumberFilled = true
} else {
self.calorieNumberFilled = false
}
return true
}
#IBAction func yourWeightTextFieldEdited(sender: AnyObject) {
if self.yourWeightFilled && self.calorieNumberFilled {
self.calculateButton.enabled = true
}
}
#IBAction func calorieNumberTextFieldEdited(sender: AnyObject) {
if self.yourWeightFilled && self.calorieNumberFilled {
self.calculateButton.enabled = true
}
}
}

Answer 1

Your delegate methods are a bit mixed up -- they have to be named exactly what the caller expects, or they won't be found, so yourWeightTextFieldValueValidInt() and calorieNumberTextFieldValueValidInt() aren't being called at all. Instead you'll need to handle the edits to both text fields in a single method:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Find out what the text field will be after adding the current edit
let text = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
if textField == yourWeightTextField {
yourWeightFilled = text.toInt() != nil
} else if textField == calorieNumberTextField {
calorieNumberFilled = text.toInt() != nil
}
return true
}