UIBarButtonItemのtintColorはios5からなのでios4でも同様なことができるように

gistfile1.m

// 出所：http://wizard.st/blog/archives/156
// 　　：http://fredandrandall.com/blog/2011/03/31/how-to-change-the-color-of-a-uibarbuttonitem/
 
        UIBarButtonItem *item = nil;
        if ([[[UIDevice currentDevice] systemVersion] floatValue] > 4.9) {
            
            item = [[UIBarButtonItem alloc] initWithTitle:title 
                                                    style:useStyle 
                                                   target:self 
                                                   action:@selector(toolBarButtonTapped:)];
            [item setTintColor:[UIColor blackColor]];
            
        } else {
            
            UISegmentedControl *btn = [[[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:title, nil]] autorelease];
            btn.momentary = YES;
            btn.segmentedControlStyle = UISegmentedControlStyleBar;
            btn.tintColor = [UIColor blackColor];
            [btn addTarget:self action:@selector(toolBarButtonTapped:) forControlEvents:UIControlEventValueChanged];
            
            item = [[UIBarButtonItem alloc] initWithCustomView:btn];
        }