change text of UILabel with timer - ios

Question

i want to change the text of a UILabel after a certain amount of time. but the text isn't changed after the set amount of time. how do i fix this?
see my code:
var countDownText = "hello"
override func didMoveToView(view: SKView) {
startButton = UILabel(frame: CGRect(x: 0, y: 0, width: 300, height: 90))
startButton.text = "\(countDownText)"
startButton.center = CGPointMake(view.frame.size.width / 2, view.frame.size.height/2)
startButton.textColor = UIColor.darkGrayColor()
startButton.font = UIFont(name: "Arial", size: 20)
startButton.textAlignment = NSTextAlignment.Center
self.view?.addSubview(startButton)
countDownTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("countDownFunc"), userInfo: nil, repeats: true)
}
func countDownFunc(){
theTime++
if(theTime >= 4){
countDownText = "testText"
}
if(theTime >= 8){
spawnEnemys()
startButton.removeFromSuperview()
countDownTimer.invalidate()
}
print(theTime)
}
thanks in advance for all your help :D

Answer 1

Your countDownFunc should be:
func countDownFunc(){
theTime++
if(theTime >= 4){
countDownText = "testText"
startButton.text = countDownText
}
if(theTime >= 8){
spawnEnemys()
startButton.removeFromSuperview()
countDownTimer.invalidate()
}
print(theTime)
}

Answer 2

There's a design flaw in your code.
You change the string assigned to the view controller's countDownText property, but that does not also change the label's current text.
Here's a simple playground example to illustrate the problem:
import UIKit
var str = "Hello, playground"
var label = UILabel()
label.text = str
str = "Goodbye, playground"
print(label.text) // "Hello, playground"
If you also want to update the label's text, you need to update its text property, similar to what you initially did:
startButton.text = "\(countDownText)"
This will update the label's text to match the countDownText property's new value.