gistfile1.m

+ (void)initialize
{
    //Unselected Background
    [[UISegmentedControl appearance] setBackgroundImage:[UIImage imageNamed:@"UISegmentedControlBackgroundUnselected"]
                                               forState:UIControlStateNormal
                                             barMetrics:UIBarMetricsDefault];
    
    //Selected Background
    [[UISegmentedControl appearance] setBackgroundImage:[UIImage imageNamed:@"UISegmentedControlBackgroundSelected"]
                                               forState:UIControlStateSelected
                                             barMetrics:UIBarMetricsDefault];
    
    //Highlighted Background
    [[UISegmentedControl appearance] setBackgroundImage:[UIImage imageNamed:@"UISegmentedControlBackgroundHighlighted"]
                                               forState:UIControlStateHighlighted
                                             barMetrics:UIBarMetricsDefault];
    
    #warning dual state not working
    //This is supposed to set background image for when a segment is both selected and highlighted
    //so it doesn't revert to the highlighted state. Doesn't work however and when I tap on the
    //selected item it takes the highlighted background from above.
    [[UISegmentedControl appearance] setBackgroundImage:[UIImage imageNamed:@"UISegmentedControlBackgroundSelected"]
                                               forState:(UIControlStateSelected|UIControlStateHighlighted)
                                             barMetrics:UIBarMetricsDefault];
}