iOS 视图同时设置圆角和阴影

参考
https://blog.csdn.net/crazy_sunshine/article/details/78029229

- (UIView *)workspaceIcon
{
    if(_workspaceIcon == nil)
    {
        _workspaceIcon = [[UIView alloc] init];
        
        _workspaceIcon.layer.shadowColor = [[UIColor blackColor] CGColor];
        _workspaceIcon.layer.shadowRadius = 4;
        _workspaceIcon.layer.shadowOpacity = 0.2;
        _workspaceIcon.layer.shadowOffset = CGSizeMake(0, 3);
        
        _workspaceIcon.layer.cornerRadius = 12.0;
    }
    
    return _workspaceIcon;
}
- (UIImageView *)workspaceIconImageView
{
    if(_workspaceIconImageView == nil)
    {
        _workspaceIconImageView = [[UIImageView alloc] init];
        
        _workspaceIconImageView.image = [UIImage imageNamed:@"pic_clock"];
        
        _workspaceIconImageView.layer.cornerRadius = 12.0;
        _workspaceIconImageView.layer.masksToBounds = YES;
    }
    
    return _workspaceIconImageView;
}