UIViewController not animating smoothly in navigation controller push

Question

I have a UIViewController called StartViewController which has a textview in it. The text view method is called when a url is clicked.

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange
{
    NSString *str = URL.resourceSpecifier;
    NSInteger length = str.length;

    if (length > 1)
    {
        AViewController *aView = [[SearchViewController alloc] init];

        aView.query = str;

        [self.navigationController pushViewController:aView animated:YES];

        return NO;
    }
}

But when the navigationcontroller gets pushed with a value and animate, it doesn't go smoothly. It goes halfway then it disappers and aView is shown.

Why?

Answer 1

Look for problems with AViewController's view.

During push operation StartViewController would slide out to about 60-70% of the screen, at the same time AViewController will slide in at the top of StartViewController. If AViewController's view has any issues (invalid frame size ?) you won't see the slide in animation.