viewDidAppear上的动画UIImageView和UITableView

Question

I have one UIViewController with my logo centered and UITableView with alpha 0.

In viewDidAppear: I have this:

[UIView animateWithDuration:0.6 delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
    [self.logo setFrame:CGRectMake(0.0f, self.view.frame.size.height - 194.0f, 320.0f, 194.0f)];
} completion:^(BOOL finished) {
    [self.table setFrame:CGRectMake(0.0f, 0.0f, 320.0f, self.view.frame.size.height - 194.0f)];

    [UIView animateWithDuration:0.4 delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
        [self.table setAlpha:1.0];
    } completion:^(BOOL finished) {
        return;
    }];

    return;
}];

Ok, the animation is what I want.

But when I call presentModalViewController: to show next view, UIImageView back to center of screen and UITableView back the the height before.

How do I stay with the same size and position after finishing the animation even change the view?

Thanks.

Answer 1

I'm assuming you set your original frames in viewDidLoad this is fine unless the modal clears your system memory. Views are cached as long as they can. So if you modal uses enough memory to reset it, viewDidLoad gets called again resetting your view.

A quick and easy way to deal with this is to set the values you want in the dismissViewController:animated: method if you're using it, or a delegate method for the modal.

If you don't have either of those you'll need to do some checking somehow if this is the first load. This isn't a clean way to deal with it though. If you show some more code we may be able to work out a better solution.

Answer 2

Note: you're using the wrong options constant. Rather than UIViewAnimationCurveEaseInOut , should be using UIViewAnimationOptionCurveEaseInOut . That probably doesn't affect your problem, but it is bad.

Also, you don't need return statements in your completion blocks.

I would check the code in your viewWillDisappear and viewDidDisappear methods. It's possible you're doing initial layout in there (or even in layoutSubviews) which is resetting the view.