How can I hide navigation bar through CAAnimation?

Actually For show/hide I am using UIView Animation. And Simple methods like animated : YES/NO. But it does not give me smooth response.. Please give me suggestions...

BOOL navBar开发者_如何学编程State = [self.navigationController isNavigationBarHidden];


    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationDuration:0.3];


    [self.navigationController setNavigationBarHidden:!navBarState animated:NO];


    [UIView commitAnimations];

It is not giving me satisfactory result I want to do the same thing with CAAnimation..

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Why do you need to place the following line into UIView animation braces:

[self.navigationController setNavigationBarHidden:!navBarState animated:NO];

Why not just call it with animated:YES without calls to [UIView beginAnimation]/[UIView commitAnimation]?

[self.navigationController setNavigationBarHidden:!navBarState animated:YES];

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CGRect rect = self.navigationController.navigationBar.frame;
    rect.origin.y = rect.origin.y < 0 ?
    rect.origin.y + rect.size.height
    :   rect.origin.y + rect.size.height;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.2];
    self.navigationController.navigationBar.frame = rect;
    [UIView commitAnimations];

Just use above code which may help you to get smooth animation...