UIView *shadowView = [[UIView alloc] init];
//设置位置和大小
shadowView.frame = CGRectMake(100,100,100,100);
//设置中心
shadowView.center = self.view.center;
//设置背景颜色
shadowView.backgroundColor = [UIColor whiteColor];
//设置阴影颜色
shadowView.layer.shadowColor = [UIColor colorWithRed:114.0/255.0green:133.0/255.0blue:152.0/255.0alpha:1.0].CGColor;
//设置阴影的透明度
shadowView.layer.shadowOpacity =0.1f;
//设置阴影的偏移
shadowView.layer.shadowOffset = CGSizeMake(30.0f,10.0f);
//设置阴影半径
shadowView.layer.shadowRadius =15.0f;
//超出父视图部分是否显示 此处一定设置成NO 否则阴影不显示
shadowView.layer.masksToBounds = NO;
//设置圆角
shadowView.layer.cornerRadius =3.0;
