Question

I want to hide a UINavigationBar that is not inside of a UINavigationController (it’s a modal view) when a button is pressed.

How can I do this? I’d like it to be animated.

Answer 1

If you want it to be animated you can just set its alpha down to 0.0

[UIView beginAnimations:@"Hide bar animation" context:NULL];
[UIView setAnimationDuration:0.5];
navigationBar.alpha = 0.0;
[UIView commitAnimations];

then back to 1.0 to unhide it

[UIView beginAnimations:@"Show bar animation" context:NULL];
[UIView setAnimationDuration:0.5];
navigationBar.alpha = 1.0;
[UIView commitAnimations];

Although in iOS 4+, the use of the block animation methods is encouraged

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion

which you can use like this:

[UIView animateWithDuration:0.5
            animations:^{ 
                navigationBar.alpha = 0.0;
            } 
            completion:^(BOOL finished){
                /* some completion code */
            }];