iOS-UIButton设置高亮状态下的背景色

UIButton一般分为高亮的普通两种状态，原生的方法可以设置这两种不同状态下的文字颜色，文字内容，背景图片，按钮图片。但是不能设置按钮的背景色。

方法一：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];
}

方法二：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;
}