Question

I am trying to do custom animations between view controllers and in the case below I am doing a mimicking of UINavigationController’s popViewController. However, it seems to lag a lot on iPhones and especially iPads and Time Profiler confirms it saying that all of the lag comes from the addSubview line.

Anyway, I connect nlView via Interface Builder and I use the code below:

    [self.view.superview addSubview:nlView.view];
    [nlView.view setFrame:CGRectMake(-kWidth, 20, kWidth, kHeight-20)];
    [UIView animateWithDuration:2
                     animations:^{
                         [nlView.view setFrame:CGRectMake(0, 20, kWidth, kHeight-20)];
                         [self.view setFrame:CGRectMake(kWidth, 20, kWidth, kHeight-20)];
                     }
                     completion:^(BOOL finished){
                         [self.view removeFromSuperview];
                     }];

So, how could I minimize this lag to nothing at all? There are no leaks or anything like that but how could I just change my logic so that there is no lag when changing views?

Thanks!

Answer 1

If you want to animate the view’s position then instead of setting the frame, animate the view’s layer position like this: [nlView.view.layer setPosition: newPosition]... of course you need to add QuartzCore to your project and import QuartzCore/QuartzCore.h