(Swift) Fade-In and Out a Label [duplicate] - ios

Question

This question already has answers here:
UIView Hide/Show with animation
(22 answers)
Closed 6 years ago.
I'm trying to fade a label in and out when it appears on the screen. Currently, I'm simply hiding it using
button.hidden = true
and unhiding it by using false. I would like to animate this process with a fade-in and out as it looks much smoother this way. Appreciate the help !
Here is the code I'm using which gets an error. http://imgur.com/a/HI4eg
class ViewController: UIViewController {
#IBOutlet weak var yeah: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseOut, animations: {
self.yeah.alpha = 0.0
}, completion: {
(finished: Bool) -> Void in
//Once the label is completely invisible, set the text and fade it back in
self.yeah.text = "your Text "
// Fade in
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseIn, animations: {
self.yeah.alpha = 1.0
}, completion: {
(finished: Bool) -> Void in
//Once the label is completely invisible, set the text and fade it back in
self.yeah.text = "your Text "
// Fade in
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseIn, animations: {
self.yeah.alpha = 1.0
}, completion:nil )
})
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
}

Answer 1

As explained in andrew bancroft's blog
// Move our fade out code from earlier
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseOut, animations: {
self.yourLabel.alpha = 0.0
}, completion: {
finished in
if finished {
//Once the label is completely invisible, set the text and fade it back in
self.yourLabel.text = "your Text "
// Fade in
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseIn, animations: {
self.yourLabel.alpha = 1.0
}, completion: nil)
}
})
Modified Answer
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseOut, animations: {
self.yourLabel.alpha = 0.0
}, completion: {
finished in
if finished {
//Once the label is completely invisible, set the text and fade it back in
self.yourLabel.text = "your Text "
// Fade in
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseIn, animations: {
self.yourLabel.alpha = 1.0
}, completion: {
finished in
if finished {
//Once the label is completely invisible, set the text and fade it back in
self.yourLabel.text = "your Text "
// Fade in
UIView.animateWithDuration(1.0, delay: 0.0, options: .CurveEaseIn, animations: {
self.yourLabel.alpha = 0.0
}, completion: nil)
}
})
}
})