Question

The search bar is animated using the following code:

- (IBAction)toggleSearchBar:(UIBarButtonItem *)sender{

CATransition *applicationLoadViewIn = [CATransition animation];
[applicationLoadViewIn setDuration:0.2];
[applicationLoadViewIn setType:kCATransitionPush];
[applicationLoadViewIn setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];

if (self.searchBar.hidden) {

    self.searchBar.hidden = NO;
    [self.searchBar becomeFirstResponder];

    [applicationLoadViewIn setSubtype:kCATransitionFromBottom];
    [[searchBar layer] addAnimation:applicationLoadViewIn forKey:kCATransitionPush];

}else{

    self.searchBar.hidden = YES;
    [self.searchBar resignFirstResponder];

    [applicationLoadViewIn setSubtype:kCATransitionFromTop];
    [[searchBar layer] addAnimation:applicationLoadViewIn forKey:kCATransitionPush];

}
}

It works fine except the lag at the first run of the animation. Is there anyway to fix it? Any help will be appreciated:)

Edit 1

he leftBarButton is wired to toggleSearchBar: action. The app is loaded. The first animation is the first time the leftBarButton clicked.

Answer 1

Why don’t you show it off screen on loading the view controller… it’s a bit hacky but it should do the trick.