Managing scrollview.contentInset adjustment manually

gistfile1.m

- (void) setScrollView:(UIScrollView*)scrollView contentInsets:(UIEdgeInsets)edgeInsets byAdjustingForStandardBars:(BOOL)adjustStandardBars
{
    if (adjustStandardBars)
    {
        UINavigationController* navController = self.navigationController;
        
        if (navController)
        {
            CGRect navBarFrame = self.navigationController.navigationBar.frame;
            edgeInsets.top += CGRectGetMinY(navBarFrame);           // statusbar
            edgeInsets.top += CGRectGetHeight(navBarFrame);         // navbar height
            
            if (!self.navigationController.toolbarHidden) {
                CGRect toolbarFrame = self.navigationController.toolbar.frame;
                edgeInsets.bottom += CGRectGetHeight(toolbarFrame); // toolbar height
            }
        }
        
        if (self.tabBarController)
        {
            CGRect tabBarFrame = self.tabBarController.tabBar.frame;
            edgeInsets.bottom += CGRectGetHeight(tabBarFrame);      // tabbar height
        }
    }
    
    scrollView.contentInset = edgeInsets;
    scrollView.scrollIndicatorInsets = edgeInsets;
    if (CGPointEqualToPoint(scrollView.contentOffset, CGPointZero)) {
        scrollView.contentOffset = CGPointMake(0,-edgeInsets.top);
    }
}