遍历父视图上的button

 for (UIView * thebtn in [self.view subviews])

 {

     if ([thebtn isKindOfClass:[UIButton class]])

        {     //***改变字体颜色

            [(UIButton *)thebtn setTitleColor:[UIColor redColor]     forState:UIControlStateNormal];

            //***改变背景

         [(UIButton *)thebtn setBackgroundImage:nil forState:UIControlStateNormal];

   }

 }