[Solved] Changing the view color when comparing values

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In your view controller you need to add UITextFieldDelegate which will allow you to access methods related to your text field. The top of your view controller should look like this:

class ViewController: UIViewController,UITextFieldDelegate  //set delegate to class

You then need to set the delegate of your text field to self in viewDidLoad and add a target for when the text field changes:

override func viewDidLoad() {
    super.viewDidLoad()
    localTemp.delegate = self     //set delegate to this vc
    localTemp.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
}

You can then implement this method which will run on every key press and you need to call your changeColor() method as above:

func textFieldDidChange(textField: UITextField) {
    self.changeColor()
}

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solved Changing the view color when comparing values