Workaround for custom UIViewController animations in landscape?

Question

I have a custom animated UIViewController transition, and it seems that there is a bug in iOS that screws up the layout in landscape orientation. In the main animation method, i

Answer 1

I was stumped with this issue as well. I didn't like the switch/case solution too much. I ended up creating this function instead:

@implementation UIView (Extras)

- (CGRect)orientationCorrectedRect:(CGRect)rect {
    CGAffineTransform ct = self.transform;

    if (!CGAffineTransformIsIdentity(ct)) {
        CGRect superFrame = self.superview.frame;
        CGPoint transOrigin = rect.origin;
        transOrigin = CGPointApplyAffineTransform(transOrigin, ct);

        rect.origin = CGPointZero;
        rect = CGRectApplyAffineTransform(rect, ct);

        if (rect.origin.x < 0.0) {
            transOrigin.x = superFrame.size.width + rect.origin.x + transOrigin.x;
        }
        if (rect.origin.y < 0.0) {
            transOrigin.y = superFrame.size.height + rect.origin.y + transOrigin.y;
        }
        rect.origin = transOrigin;
    }

    return rect;
}

- (CGRect)orientationCorrectedRectInvert:(CGRect)rect {
    CGAffineTransform ct = self.transform;

    if (!CGAffineTransformIsIdentity(ct)) {
        ct = CGAffineTransformInvert(ct);

        CGRect superFrame = self.superview.frame;
        superFrame = CGRectApplyAffineTransform(superFrame, ct);
        CGPoint transOrigin = rect.origin;
        transOrigin = CGPointApplyAffineTransform(transOrigin, ct);

        rect.origin = CGPointZero;
        rect = CGRectApplyAffineTransform(rect, ct);

        if (rect.origin.x < 0.0) {
            transOrigin.x = superFrame.size.width + rect.origin.x + transOrigin.x;
        }
        if (rect.origin.y < 0.0) {
            transOrigin.y = superFrame.size.height + rect.origin.y + transOrigin.y;
        }

            rect.origin = transOrigin;
        }

        return rect;
    }

Basically, you can create your frame rects using the portrait or landscape coordinates but run it through the function with the view's transform before applying it to the view. With this method, you can use bounds to get correct view size.

        CGRect endFrame = toViewController.view.frame;
        CGRect startFrame = endFrame;
        startFrame.origin.y = fromViewController.view.bounds.size.height;

        endFrame = [fromViewController.view orientationCorrectedRect:endFrame];
        startFrame = [fromViewController.view orientationCorrectedRect:startFrame];

        toViewController.view.frame = startFrame;