gistfile1.m

- (void)performLayout
{
    [super performLayout];
    
    myScrubView.frame = self.bounds;
    __block BOOL reload = NO;
    
    UIView (^addSubView)(UIView *) = ^ (UIView *subview) {
        subview.alpha = 0.0;
        if (subview != nil)
            subview.alpha = 1.0;
        else
        {
            subview = [[UIView alloc] init];
            [myScrubView addSubview:subview];
            reload = YES;
        }
        subview.frame = myScrubView.bounds;
        return subview;
    };
    
    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
    UIView *subView = addSubView(orientation == UIInterfaceOrientationPortrait ? myPortraitView : myLandscapeView);
    if (orientation == UIInterfaceOrientationPortrait) {
        myPortraitView = subView;
    } else {
        myLandscapeView = subView;
    }
    
    if (reload)
        [self reloadData];
}