Fade In Fade Out Animation

Question

Here is some code I struggle with for a while.

If you start the fade in animation, the label text fades in. If I start the fade out animation the the label text fades out.

When I start the startFade method, only fade out is shown. How can I wait for the fadeIn method to finish visually before starting the fadeOut method.

-(IBAction)startFade:(id)sender{
    [self fadeIn];
    [self fadeOut];
}

-(IBAction)fadeIn:(id)sender{
    [self fadeIn];
}

-(IBAction)fadeOut:(id)sender{
[self fadeOut];
}

-(void) fadeIn{
    [_label setAlpha:0];
    [UILabel beginAnimations:NULL context:nil];
    [UILabel setAnimationDuration:2.0];
    [_label setAlpha:1];
    [UILabel commitAnimations];
}

-(void) fadeOut{
    [UILabel beginAnimations:NULL context:nil];
    [UILabel setAnimationDuration:2.0];
    [_label setAlpha:0];
    [UILabel commitAnimations];
}

Answer 1

The fade in and fade out animations can be combined using UIView.animate(withDuration: animations:)

UIView.animate(withDuration: animationDuration, animations: {
            myView.alpha = 0.75
            myView.alpha = 1.0
        })