iphone/ipad orientation handling

Question

This is more of a general question for people to provide me guidance on, basically Im learning iPad/iPhone development and have finally come across the multi-orientation support question.

I have looked up a fair amount of doco, and my book "Beginning iPhone 3 Development" has a nice chapter on it.

But my question is this, if I was to programatically change my controls (or even use different views for each orientation) how on earth to people maintain their code base? I can just imagine so many issues with spaghetti code/thousands of "if" checks all over the place, that it would drive me nuts to make one small change to the UI arrangement.

Does anyone have experience handling this issue? What is a nice way to control it?

Thanks a lot Mark

Answer 1

I do this with two simple methods in my view controller:

- (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    [self adjustViewsForOrientation:toInterfaceOrientation];
}

- (void) adjustViewsForOrientation:(UIInterfaceOrientation)orientation {
    if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight) {
        titleImageView.center = CGPointMake(235.0f, 42.0f);
        subtitleImageView.center = CGPointMake(355.0f, 70.0f);
        ...
    }
    else if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown) {
        titleImageView.center = CGPointMake(160.0f, 52.0f);
        subtitleImageView.center = CGPointMake(275.0f, 80.0f);
        ...
    }
}

To keep this clean you could easily compartmentalize the view adjustments/reloading/etc. with methods called from inside the single if-else conditional.