iOS 让tabbr背景透明看到页面内容的方法

tabbar.backgroundImage = [self imageWithColor:[UIColor colorWithRed:1 green:1 blue:1 alpha:0]];
- (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;
}