Xcode ViewDidLoad动画Swift

Question

I'm having some trouble with the animations in a tabbed app in Xcode. I have the viewDidLoad and the viewDidAppear parts, the problem is that I have two labels label1 and label2 . I would like label1 appearing only once when the application loads, and label2 appearing every time I go back to the FirstView.

So the logical thing to do would be:

override func viewDidLoad(animated: Bool) {
    super.viewDidLoad()

    self.label1.alpha = 0
    self.label2.alpha = 0

    //this is the animation
    UIView.animateWithDuration(2.0, animations: { () -> Void in
        self.label1.alpha = 1.0
        //this is what happens after a delay
        [DELAY CODE]
                self.label1.alpha = 0.0

    })
}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    UIView.animateWithDuration(2.0, animations: { () -> Void in
        self.label2.alpha = 1.0

}

Essentially what this should do is make label1 appear and disappear only once, and make label2 appear every time firstView shows up on the screen. The problem is that I have an error in the first line telling me "Method does not override any method from its superclass" . So how can I do what I am trying to achieve?

Answer 1

You have to remove the animated:Bool from your viewDidLoad -method. there is no such parameter in this method.

So it should look like that:

override func viewDidLoad() {

Answer 2

Try This :

    UIView.animateWithDuration(2.0,
                        animations: { () -> Void in

                       // Your animation method
         self.label1.alpha = 1.0

                    }) { (Bool) -> Void in
                        // Call your delay method here.
                        // Delay - 3 seconds

               NSTimer.scheduledTimerWithTimeInterval(NSTimeInterval(3),
                                        target: self, 
                                      selector: "hideLabel", 
                                      userInfo: nil, 
                                       repeats: false)
                    }

//

func hideLabel {

           UIView.animateWithDuration(2,
                  animations: { () -> Void in

                self.label1.alpha = 0.0
           })
}