iOS 按钮点击改变背景色

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, 50, 80, 40)];

      btn.backgroundColor= [UIColor colorWithRed:76/255.0 green:91/255.0blue:120/255.0 alpha:1];

      [btn.layer setCornerRadius:3];

      btn.layer.masksToBounds = YES;

      [btn setTitle:@"button" forState:UIControlStateNormal];

      [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

      [btn setBackgroundImage:[self imageWithColor: [UIColor colorWithRed:76/255.0green:91/255.0 blue:120/255.0 alpha:1]] forStat e:UIControlStateNormal];

      [btn setBackgroundImage:[self imageWithColor: [UIColor colorWithRed:54/255.0green:65/255.0 blue:87/255.0 alpha:1]] forState :UIControlStateHighlighted];

      [self.view addSubview:btn];

}

//  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;

}