如何将UITableView的顶部粘贴到UISearchBar的底部？

问题描述

我有一个UTableView：

I have a UTableView:

tableView = UITableView()
        tableView.dataSource = self
        tableView.delegate = self
        tableView.register(UINib(nibName: "TableViewCell", bundle: nil), forCellReuseIdentifier: "Cell")
        tableView.rowHeight = 60.0
        tableView.tableFooterView = UIView()
        view.addSubview(tableView)

        tableView.translatesAutoresizingMaskIntoConstraints = false

        tableViewHeightAnchor = tableView.heightAnchor.constraint(equalToConstant: 0)
        let constraints = [tableView.topAnchor.constraint(equalTo: view.topAnchor), tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor), tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor), tableViewHeightAnchor!]
        NSLayoutConstraint.activate(constraints)

而我的搜索栏是：

    searchController = UISearchController(searchResultsController: nil)
    searchController.searchResultsUpdater = self
    searchController.searchBar.delegate = self
    searchController.obscuresBackgroundDuringPresentation = false
    searchController.searchBar.placeholder = "Search for a cell"
    navigationItem.searchController = searchController
    definesPresentationContext = true

但我想设置我的顶部锚点为：

but I wish to set my top anchor as:

tableView.topAnchor.constraint(equalTo: searchController.searchBar.bottomAnchor)

但不是：

tableView.topAnchor.constraint(equalTo: view.topAnchor)

但是当我将其粘贴在searchBar的bottomAnchor上时

But when I stick it to the bottomAnchor of searchBar the app crashes because of the different hierarchies.

'Unable to activate constraint with anchors <NSLayoutYAxisAnchor:0x6000017a6cc0 "UITableView:0x7f81c4876e00.top"> and <NSLayoutYAxisAnchor:0x6000017a6dc0 "_UISearchControllerView:0x7f81c2d3fa30.bottom"> because they have no common ancestor.  Does the constraint or its anchors reference items in different view hierarchies?  That's illegal.'

我该如何解决这个问题？
我已经尝试解决此问题3天，没有成功

How can I solve the problem?I'm trying to solve this problem already 3 days and no success

推荐答案

选项A（导航栏中的搜索栏bar）：

Option A (search bar in navigation bar):

let tableView = UITableView()
view.addSubview(tableView)

let searchController = UISearchController(searchResultsController: nil)
navigationItem.searchController = searchController

definesPresentationContext = true

tableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
    tableView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
    tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
    tableView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
])

选项B（搜索栏为表标题视图）

Option B (search bar as table header view):

let tableView = UITableView()
view.addSubview(tableView)

let searchController = UISearchController(searchResultsController: nil)
tableView.tableHeaderView = searchController.searchBar

definesPresentationContext = true

tableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
    tableView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
    tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
    tableView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
])

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