今天用到UISearchBar，之前网上提供的方法已经不能有效的去除掉它的背景色了，修改背景色方法如下：

mySearchBar.backgroundColor = RGBACOLOR(249,249,249,1);mySearchBar.backgroundImage = [self imageWithColor:[UIColor clearColor] size:mySearchBar.bounds.size];//取消searchbar背景色- (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size{CGRect rect = CGRectMake(0, 0, size.width, size.height);UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetFillColorWithColor(context, [color CGColor]);CGContextFillRect(context, rect);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;}