Swift 聚焦UISearchController时重置UIView

我正面临一个问题，我可以在我的

UIViewController

中看到一个黑色部分，其中我有一个

UISearchController

，

UICollectionView

和

UISegmentControl

，因为我的设计很差。
我使用以下代码在

navigationbar

中添加了

UISearchController

：

func setupSearchBar(){

        navigationItem.searchController = taskSearchController
        taskSearchController.searchBar.tintColor = .white
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [NSAttributedStringKey.foregroundColor.rawValue: UIColor.lightGray]

        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).attributedPlaceholder = NSAttributedString(string: "Search Text", attributes: [NSAttributedStringKey.foregroundColor: UIColor.lightGray])

        if let textfield = taskSearchController.searchBar.value(forKey: "searchField") as? UITextField {
            if let backgroundview = textfield.subviews.first {
                backgroundview.backgroundColor = UIColor.init(white: 1, alpha: 1)
                backgroundview.layer.cornerRadius = 10
                backgroundview.clipsToBounds = true
            }
        }
        taskSearchController.hidesNavigationBarDuringPresentation = true
        //navigationItem.hidesSearchBarWhenScrolling = false
        //taskSearchController.searchBar.scopeButtonTitles = ["ASSIGNED TASK","CREATED TASK"]
    }

func setupView(){
        //self.view.addSubview(coverView)
        self.view.addSubview(taskSegment)

    taskSegment.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
    taskSegment.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    taskSegment.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    taskSegment.heightAnchor.constraint(equalToConstant: 30).isActive = true

    self.view.addSubview(collectionView)
    collectionView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
    collectionView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
    collectionView.topAnchor.constraint(equalTo: taskSegment.bottomAnchor, constant: 10).isActive = true
    collectionView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: 5).isActive = true

}

添加

UISearchController

后，我将使用以下代码添加

UISegmentControl

和

UICollectionView

：

func setupSearchBar(){

        navigationItem.searchController = taskSearchController
        taskSearchController.searchBar.tintColor = .white
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [NSAttributedStringKey.foregroundColor.rawValue: UIColor.lightGray]

        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).attributedPlaceholder = NSAttributedString(string: "Search Text", attributes: [NSAttributedStringKey.foregroundColor: UIColor.lightGray])

        if let textfield = taskSearchController.searchBar.value(forKey: "searchField") as? UITextField {
            if let backgroundview = textfield.subviews.first {
                backgroundview.backgroundColor = UIColor.init(white: 1, alpha: 1)
                backgroundview.layer.cornerRadius = 10
                backgroundview.clipsToBounds = true
            }
        }
        taskSearchController.hidesNavigationBarDuringPresentation = true
        //navigationItem.hidesSearchBarWhenScrolling = false
        //taskSearchController.searchBar.scopeButtonTitles = ["ASSIGNED TASK","CREATED TASK"]
    }

func setupView(){
        //self.view.addSubview(coverView)
        self.view.addSubview(taskSegment)

    taskSegment.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
    taskSegment.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    taskSegment.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    taskSegment.heightAnchor.constraint(equalToConstant: 30).isActive = true

    self.view.addSubview(collectionView)
    collectionView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
    collectionView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
    collectionView.topAnchor.constraint(equalTo: taskSegment.bottomAnchor, constant: 10).isActive = true
    collectionView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: 5).isActive = true

}

这是我最初的看法，很好

这就是聚焦于

UISearchController

时的外观

在这里，您可以看到当

navigationBar

隐藏和

UISearchController

放置在顶部时，我的

UISegment

和

UIcollectionView

保持在相同的位置，因此我想根据

UISearchController

中的更改来移动它

谁能告诉我该怎么办

---

提前感谢。

它会隐藏导航栏，因为已设置为true。这是故意的行为

---

您需要禁用此选项，以便视图约束在演示过程中不会更改，或者需要修改约束，以便视图能够根据导航栏的高度更改进行调整。通过将顶部约束设置到主视图的安全区域，您应该能够非常轻松地完成此操作

我已经使用iOS11中的自动布局检查将

UISegmentControl

设置为视图的安全区域。搜索栏（如

navigationItem.searchController=taskSearchController

）默认隐藏，向下拖动时显示。你有没有做些什么来推翻这个？当以编程方式添加约束时，您应该设置

translatesAutoresizingMaskIntoConstraints=false

黑屏是窗口的颜色，如果我将窗口颜色设置为白色，则黑屏将变为白色。这解决了一个问题。但间距问题仍然存在，我需要将CollectionView推到搜索栏。