展示效果

shadowView.png

设计思路

1. 先创建一个shadowView，负责阴影的显示，设置其shadowColor、shadowOffset、shadowRadius以及shadowOpacity的设置
2. 再创建一个圆角view，负责view圆角的展示。设置圆角的相关设置，例如cornerRadius以及maskToBounds
3. 将圆角view添加到shadowView上

贴代码

-(void)shadowViewWithCorner{
    //1.先创建一个shadowView（阴影层view），负责shadow的显示
    UIView *shadowView = [[UIView alloc]initWithFrame:CGRectMake(100,100,200,200)];
    [self.view addSubview:shadowView];
    shadowView.layer.shadowColor = UIColor.lightGrayColor.CGColor;
    shadowView.layer.shadowOffset = CGSizeMake(0,0);
    shadowView.layer.shadowRadius = 10.0f;
    shadowView.layer.shadowOpacity = 10.0f;
    
    //2.再创建一个roundCornerView（圆角view），负责圆角的展示
    UIView *roundCornerView = [[UIView alloc]initWithFrame:CGRectMake(0,0,200,200)];
    roundCornerView.layer.cornerRadius = 10.0f;
    roundCornerView.layer.masksToBounds = YES;
    roundCornerView.backgroundColor = UIColor.whiteColor;

    //3.将圆角view添加到shadowView上
    [shadowView addSubview:roundCornerView];
}

更好的解决方案

第三方框架YCShadowView