button点击设置背景色

1，通过按钮的事件来设置背景色

- (void)viewDidLoad {
  [super viewDidLoad];
  UIButton *button1 = [[UIButton alloc] initWithFrame:CGRectMake(50, 200, 100, 50)];
  [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];
}
//  button1普通状态下的背景色
- (void)button1BackGroundNormal:(UIButton *)sender
{
  sender.backgroundColor = [UIColor orangeColor];
}
//  button1高亮状态下的背景色
- (void)button1BackGroundHighlighted:(UIButton *)sender
{
  sender.backgroundColor = [UIColor greenColor];
}

2,通过把颜色转换为UIImage来作为按钮不同状态下的背景图片

- (void)viewDidLoad {
  [super viewDidLoad];
  UIButton *button2 = [[UIButton alloc] initWithFrame:CGRectMake(170, 200, 100, 50)];
  [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];
}
//  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;
}