AnimateKeyframes animate for the UILabel's value - swift

Question

I ran the code below and the label was moved perfectly. But I want to increase the value of the label at the same time with each move. I have tried many ways but it doesn't work.
UIView.animateKeyframes(withDuration: 6, delay: 0, options: [], animations: {
UIView.addKeyframe(withRelativeStartTime: (0 / 6), relativeDuration: (2 / 6), animations: {
self.label.transform = label.transform.translatedBy(x: 0, y: 50) //OK
//I want the value of the label to be increased from 0 to 5 (exactly equal to the duration of this key frame)
})
UIView.addKeyframe(withRelativeStartTime: (2 / 6), relativeDuration: (2 / 6), animations: {
self.label.transform = label.transform.translatedBy(x: 50, y: 0) //OK
//Then I want the value of the label to decrease from 5 to 0
})
}, completion: nil)
Can you help me? Thanks in advance!

Answer 1

You will not be able to do it within the animation block, you can use Timer and change label's text property with it.
Example, in your case I would do it like this:
var tick = 0
let duration: TimeInterval = 6
let countTo = 5
Timer.scheduledTimer(withTimeInterval: duration / (2 * Double(countTo)), repeats: true) { timer in
tick += 1
let mod = tick % countTo
if tick >= countTo, tick < countTo * 2 {
label.text = String(countTo - mod)
} else {
label.text = String(mod)
}
if tick >= countTo * 2 {
timer.invalidate()
}
}
UIView.animateKeyframes(withDuration: duration, delay: 0, options: [], animations: {
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5, animations: {
label.transform = label.transform.translatedBy(x: 0, y: 50)
})
UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5, animations: {
label.transform = label.transform.translatedBy(x: 50, y: 0)
})
}, completion: nil)
This way you can set duration you need and to what number you want to count to and back to 0 within the duration.