Custom Animations with UIViewController

Question

I'm using a custom animation to present my view controllers. Here's the code:

-(void)launchCustomModal:(id)sender
{
    UIButton *buttonClicked = (UIButton *)sender;
    int selection;
    selection = buttonClicked.tag;
    [ticker removeFromSuperview];
    ticker = nil;

    if (selection == 3)
    {
        MyViewController *myVC = [[MyViewController alloc]initWithNibName:nil bundle:nil];
        modalViewController= [[UINavigationController alloc]initWithRootViewController:myVC];
        modalViewController.navigationBarHidden = YES;
        [modalViewController setToolbarHidden:YES];

        CGRect result = self.view.bounds;
        result.origin.y = -result.size.height;
        modalViewController.view.frame=result;
        [self.view addSubview:modalViewController.view];

        [UIView animateWithDuration:.375 
                         animations:^{ 
                             modalViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
                         }
                         completion:^(BOOL finished) {
                             NSLog(@"Finished");          
                         }];
    }

    return;
}

I've noticed this method makes for a very laggy transition. If I launch the VC in a normal modal, it works quite smoothly. Also, if I animate just a view independent of a view controller, it also works perfectly smoothly. I'm wondering if there is something about the VC that might be causing it to animate so poorly? If its a symptom of something I'm doing or if view controllers are just not meant to be handled this way, etc. Any input is greatly appreciated. Thanks!

fixed! I removed a shadow from MyViewController and it works great now. guess those are tough to render — Sean Danzeiser, Apr 16 '12 at 20:33
Yep, shadows will do it every time. I avoid them like the plague. — Aaron Hayman, Apr 16 '12 at 20:38
Please add your solution as a proper answer, that way it's easier for future readers to see you found a solution :-) — , Aug 21 '12 at 15:26

score 0 · Accepted Answer · answered Aug 22 '12 at 20:31

0

It was the CALayer shadows. removed them and it worked fine.

answered Aug 22 '12 at 20:31

Sean Danzeiser

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Custom Animations with UIViewController

1 Answers1