Swift 4 - iOS 11搜索栏范围不会出现

Question

我有一个应用程序在iOS 10上运行良好且没有任何问题,但是对于iOS 11和Xcode Beta 5,我在搜索栏范围内遇到了这个奇怪的问题,其中范围栏似乎是从底部剪切的.(对于Xcode beta和iOS 11的所有版本都是如此)如果有人能让我朝着正确的方向前进,我真的很高兴.谢谢

在上面你可以看到我按下汉堡菜单按钮时看到的内容.这里没问题..搜索栏还有一个范围栏,当点击时显示.我没有设置它以编程方式显示.但我想这是设置范围按钮标题时的默认行为.

问题:

当我点击搜索栏输入信息时,我会看到上面的屏幕.在iOS 10上,我没有遇到任何问题.但是现在,在iOS 11中,无论我做什么,我都无法让它像在iOS 10上一样工作.搜索范围栏显示为从底部剪切.

这是它在iOS 10中的显示方式,我希望它在iOS 11中.

屏幕的故事板视图

我在这里粘贴相关代码.

    class SlideMenuViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UISearchControllerDelegate,UIGestureRecognizerDelegate{

     let searchController = UISearchController(searchResultsController: nil)

    @IBOutlet var sview: UIView!

    @IBOutlet var tableView: UITableView!



override func viewWillAppear(_ animated: Bool) {
//some non relevant code before this

 if sview.subviews .contains(searchController.searchBar) {
            print("Already contains")


        } else {

            sview.addSubview(searchController.searchBar)
            print(searchController.searchBar.showsScopeBar)

            searchController.searchBar.sizeToFit()
            searchController.searchBar.frame.size.width = view.frame.size.width



          searchController.searchBar.barTintColor = searchBarTintColor

            searchController.searchBar.tintColor = searchTintColor
        }



    }


override func viewDidLoad() {

//some other code

searchController.searchBar.delegate = self

searchController.searchBar.scopeButtonTitles = [NSLocalizedString("?simlerde", comment: ""), NSLocalizedString("Aç?klamalarda", comment: "")]

        searchController.searchBar.returnKeyType = UIReturnKeyType.done

searchController.searchResultsUpdater = self

        searchController.dimsBackgroundDuringPresentation = false
        definesPresentationContext = true

//some other code

}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

     if searchController.isActive && searchController.searchBar.text != "" {

        switch scpglobal {
            case NSLocalizedString("?simlerde", comment: ""):
                return filteredIsimler.count

            case NSLocalizedString("Aç?klamalarda", comment: ""):
                return filteredAciklamalar.count

            default:
                print("Tableview default")
        }

        }



        return isimlerArray.count
    }

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

//some code about search here but nothing that will result in that behaviour

}

 func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        print("cancel")
        searchController.searchBar.text = ""

    }


func updateSearchResults(for searchController: UISearchController) {


        let searchBar = searchController.searchBar



        let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex]
        filterContentForSearchText(searchText: searchController.searchBar.text!, scope: scope)
        tableView.reloadData()
    }

}


extension SlideMenuViewController:UISearchBarDelegate {
    func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
        filterContentForSearchText(searchText: searchController.searchBar.text!, scope: searchController.searchBar.scopeButtonTitles![selectedScope])
    }
}

编辑:如果我向搜索栏添加约束,会发生这种情况.首先一切似乎都很好.

然后,当您单击搜索栏时,会发生这种情况.搜索栏移出屏幕.见箭头.

但是如果你关闭滑动菜单然后重新打开它

一切正常,直到您单击取消按钮.之后,您必须再次执行此操作才能看到搜索栏正常工作.

约束的代码

 searchController.searchBar.translatesAutoresizingMaskIntoConstraints = false
 sview.addConstraint(NSLayoutConstraint(item: searchController.searchBar, attribute: .top, relatedBy: .equal, toItem: sview, attribute: .top, multiplier: 1, constant: 0))
 sview.addConstraint(NSLayoutConstraint(item: searchController.searchBar, attribute: .bottom, relatedBy: .equal, toItem: sview, attribute:.bottom, multiplier: 1, constant: 0))

 sview.addConstraint(NSLayoutConstraint(item: searchController.searchBar, attribute: .leading, relatedBy: .equal, toItem: sview, attribute: .leading,multiplier: 1, constant: 0))
 sview.addConstraint(NSLayoutConstraint(item: searchController.searchBar, attribute: .trailing, relatedBy: .equal, toItem: sview, attribute: .trailing, multiplier: 1, constant: 0))

Answer 1

看看这个WWDC 2017视频.

你应该做这样的事情:

if #available(iOS 11.0, *) {
    navigationItem.searchController = searchController
    navigationItem.hidesSearchBarWhenScrolling = false
} else {
    tableView.tableHeaderView = searchController.searchBar
}

然后相应地进行所需的更改.