//  颜色转换为背景图片

 - (UIImage *)imageWithColor:(UIColor *)color {

     CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

     UIGraphicsBeginImageContext(rect.size);

     CGContextRef context = UIGraphicsGetCurrentContext();

     CGContextSetFillColorWithColor(context, [color CGColor]);

     CGContextFillRect(context, rect);

     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

     UIGraphicsEndImageContext();

     return image;

 }

 - (void)viewDidLoad {

     [super viewDidLoad];

     UIButton *button1 = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];

     [button1 setTitle:@"button1" forState:UIControlStateNormal];

     button1.backgroundColor = [UIColor orangeColor];

     [button1 addTarget:self action:@selector(button1BackGroundHighlighted:) forControlEvents:UIControlEventTouchDown];

     [button1 addTarget:self action:@selector(button1BackGroundNormal:) forControlEvents:UIControlEventTouchUpInside];

     [self.view addSubview:button1];

     UIButton *button2 = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];

     [button2 setTitle:@"button2" forState:UIControlStateNormal];

     [button2 setBackgroundImage:[self imageWithColor:[UIColor redColor]] forState:UIControlStateNormal];

     [button2 setBackgroundImage:[self imageWithColor:[UIColor grayColor]] forState:UIControlStateHighlighted];

     [self.view addSubview:button2];

 }