Fading In And Fading Out A Label Infinitively With separate `text` - ios

Question

I have a label in xCode that I want to infinitely fade between a word and then the current time.
I've had a look online and can find a single fade but am new to Swift so I'm struggling to adapt this to my need.
Any help would be amazing, Thanks!

Answer 1

Here is an example of how to do this:
#IBOutlet weak var label: UILabel!
#IBAction func fade_out(sender: AnyObject) {
fade(label)
}
#IBAction func reset(sender: AnyObject) {
label.text = "label"
}
func fade(label : UILabel) {
UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
label.alpha = 0.0
}, completion: nil)
UIView.animateWithDuration(2.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: {
label.alpha = 1.0
label.text = String(NSDate())
}, completion: nil)
}
What I do is that I fade out the label first with UIViewAnimationOptions.CurveEaseOut and then fade it in again with todays date with UIViewAnimationOptions.CurveEaseIn.
Here is a test project I created for you so that you can see how I have done it.
Edit
To do it infinity, you can do it like this and without a button
var timer = NSTimer()
var b = false
override func viewDidLoad() {
super.viewDidLoad()
self.timer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: #selector(ViewController.fade), userInfo: nil, repeats: true)
}
func fade() {
if b{
UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
self.label.alpha = 0.0
self.label.text = "Label"
}, completion: nil)
UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: {
self.label.alpha = 1.0
self.label.text = String(NSDate())
}, completion: nil)
b = false
}
else{
UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
self.label.alpha = 0.0
self.label.text = String(NSDate())
}, completion: nil)
UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: {
self.label.alpha = 1.0
self.label.text = "Label"
}, completion: nil)
b = true
}
}

Answer 2

A much Elegant way will be to use CAAnimation ->
class YourClass: UIViewController , ..{
#IBOutlet weak var fadingLabel: UILabel!
var a = true
override func viewDidLoad() {
super.viewDidLoad()
NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(ViewController.swapText), userInfo: nil, repeats: true)
let anim : CABasicAnimation = CABasicAnimation(keyPath: "opacity")
anim.fromValue = 1
anim.toValue = 0
anim.duration = 0.5
anim.autoreverses = true
anim.repeatCount = Float.infinity
fadingLabel.layer.addAnimation(anim, forKey: "flashOpacity")
}
func swapText(){
if a == true{
fadingLabel.text = String(NSDate())
a = false
}else{
fadingLabel.text = String("My Text")
a = true
}
}
}
All you gotta do now is manipulate anim.duration and timeInterval in NSTimer() accordingly ...