UIView animation hide and show

Question

I am begining to use UIView animation. And can't get such code working properly. Here is what i have

if(_Language.hidden == true)
{
    [UIView animateWithDuration:1.0
                          delay:0.0
                        options:UIViewAnimationCurveEaseInOut
                     animations:^ {
                        _Language.alpha = 1.0;
                     }
                     completion:^(BOOL finished) {
                         _Language.hidden = false;
                     }];
}
else
{
    [UIView animateWithDuration:1.0
                          delay:0.0
                        options:UIViewAnimationCurveEaseInOut
                     animations:^ {
                         _Language.alpha = 0.0;
                     }
                     completion:^(BOOL finished) {
                         _Language.hidden = true;
                     }];
}

This code works in such way. Hide animation works as expected. But show animation just waits 1 sec, and pops the object without any transition. Can anyone tell me what I am missing here?

Answer 1

You are changing the hidden attribute to true only after the animation is over, so it doesn't appear until the animation is completed. you should do it before the animation begins :

if(_Language.hidden == true)
 {
 _Language.hidden = false;
[UIView animateWithDuration:1.0
                      delay:0.0
                    options:UIViewAnimationCurveEaseInOut
                 animations:^ {
                    _Language.alpha = 1.0;  
                 }];
 }

Answer 2

Your _Language.hidden is set as true and hence when it is animating, nothing will appear on the screen. You need to make it visible before animating. Set the hidden property to false and then show the animation. The reverse will work only for hiding when you add it in completion block.

_Language.hidden = false;
[UIView animateWithDuration:1.0 ...

and remove it from completion block,

completion:^(BOOL finished) {
                     }];