Sets the backgroundColor of the specified view and all of its subviews. A tool to help debug iOS UI issues.

colorizeView.m

- (void)colorizeView:(UIView *)view
{
    static CGFloat alpha = 0.1f;

    view.backgroundColor = [[UIColor blueColor] colorWithAlphaComponent:alpha];
    alpha += 0.1f;

    for (UIView *subview in view.subviews) {
        [self colorizeView:subview];
    }

    alpha -= 0.1f;
}