最近发现头部下拉放大的代码在iOS11里的frame一直不对。所以就适配了一下，记录一下过程：
1、准备好顶部view

  lazy var topView:HRDDPersonTopContentView = {

        guard let view = Bundle.main.loadNibNamed("HRDDPersonTopContentView", owner: self, options: nil)?.first as? HRDDPersonTopContentView else {

            return HRDDPersonTopContentView()

        }

        view.frame = CGRect(x: 0, y: 0, width: WIDTH, height:173*GlobalScare)

        return view

    }()

2、在viewdidload里设置tableview的contentInset

  self.edgesForExtendedLayout = UIRectEdge()

        extendedLayoutIncludesOpaqueBars = true

        if #available(iOS 11.0, *){

            tableView.contentInsetAdjustmentBehavior = .never

        }else{

            automaticallyAdjustsScrollViewInsets = false

        }


        self.tableView.contentInset = UIEdgeInsetsMake(173*GlobalScare, 0, 0, 0)


        self.view.addSubview(self.topView)

        topView.delegate = self

        self.tableView.registerNibWithCell(HRDDPersonArrowTableCell.self)

3、在viewWillLayoutSubviews里重新设置一下contentInset和顶部view的的frame

  override func viewWillLayoutSubviews() {

        super.viewWillLayoutSubviews()

        self.tableView.contentInset = UIEdgeInsetsMake(173*GlobalScare, 0, 0, 0)

        self.topView.frame = CGRect(x: 0, y: 0, width: WIDTH, height:173*GlobalScare)

    }

4、滚动操作

  func scrollViewDidScroll(_ scrollView: UIScrollView) {

        print(scrollView.frame)

        print(scrollView.contentInset)

        let pointy = scrollView.contentOffset.y

        if pointy < -173*GlobalScare {

            var rect = self.topView.frame //self.tableView.viewWithTag(102)!.frame

            rect.size.height = -pointy

            self.topView.frame = rect

        }

    }

OK，这样就完成了，这里最大的问题就是iOS 11.0的设置问题：

extendedLayoutIncludesOpaqueBars = true

        if #available(iOS 11.0, *){

            tableView.contentInsetAdjustmentBehavior = .never

        }else{

            automaticallyAdjustsScrollViewInsets = false

        }