Label animation in Swift - ios

Question

I want to create a transition effect on my label so that it comes out from the left side of the view and centre itself in the middle of the screen. I am doing:
override func viewDidLoad() {
super.viewDidLoad()
label.center.x -= view.bounds.width
}
to place the label out of the view, but this is not working as the label is still present in the view. Please help.

Answer 1

Because label.center.x -= view.bounds.width will make it appear at the left of the view, so you can't see any effect on it.
You can use UIView.animateWithDuration to make animation effect:
UIView.animateWithDuration(0.5, delay: 0, options: [.CurveEaseOut], animations: {
label.center.x += view.bounds.width
self.view.layoutIfNeeded()
}, completion: nil)
And you should put them in your viewDidAppear instead of viewDidLoad, so everytime your view is resume, it will animate your label. Your code will look like this:
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
label.center.x = view.center.x // Place it in the center x of the view.
label.center.x -= view.bounds.width // Place it on the left of the view with the width = the bounds'width of the view.
// animate it from the left to the right
UIView.animateWithDuration(0.5, delay: 0, options: [.CurveEaseOut], animations: {
label.center.x += view.bounds.width
self.view.layoutIfNeeded()
}, completion: nil)
}
This will make your label appear from the left to the right.

Answer 2

SWIFT 5
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
label.center.x = view.center.x // Place it in the center x of the view.
label.center.x -= view.bounds.width // Place it on the left of the view with the width = the bounds'width of the view.
// animate it from the left to the right
UIView.animate(withDuration: 1, delay: 0, options: [.curveLinear], animations: {
self.label.center.x += self.view.bounds.width
self.view.layoutIfNeeded()
}, completion: nil)
}

Answer 3

Here is a solution for Swift 3
UIView.animate(withDuration: 1.0) {
label = self.view.frame.size.width / 2
}
make sure that the label is initially positioned away from the screen.