iOS阴影圆角添加的一个方式

  //         添加阴影 -- 四周都有阴影并且有圆角
       CALayer *shadowLayer = [CALayer layer];
       shadowLayer.cornerRadius = 8.0;
       shadowLayer.backgroundColor = [UIColor whiteColor].CGColor;
       shadowLayer.shadowColor = [UIColor lightGrayColor].CGColor;
       shadowLayer.shadowRadius = 3.0;
       shadowLayer.shadowOpacity = 1.0;
       shadowLayer.shadowOffset = CGSizeZero;
       shadowLayer.frame = self.contentView.frame;
       [self.layer insertSublayer:shadowLayer atIndex:0];
       self.shadowLayer = shadowLayer;
       self.clipsToBounds = NO;
       self.contentView.clipsToBounds = YES;
       self.contentView.layer.cornerRadius = 8.0;