UICollectionView

Question

这不是我想要的效果。这仅在集合视图设置为水平流布局时发生。我看过其他一些关于这个问题的帖子，但 none 提供的答案有效。有人找到解决方案了吗？

我提供了两个屏幕截图，显示了触发键盘之前和之后的 UITextField。如您所见，UITextField 连同整个集合视图（看不到）与键盘一起被向上推。通常键盘被覆盖，对视图没有影响。

之前

之后

更新提供的代码。我以前实现的方法不涉及Storyboard。

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?


func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    window = UIWindow()
    window?.makeKeyAndVisible()

    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .horizontal
    let rvc = ViewController(collectionViewLayout: layout)
    window?.rootViewController = rvc

    return true
}

// .... other boilerplate code provided by Apple when you make a new App
}

ViewController.swift

class ViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout, UITextFieldDelegate {
    let homeCellId = "homeCellId"
    let worldCellId = "worldCellId"

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.white
        collectionView?.register(HomeCell.self, forCellWithReuseIdentifier: homeCellId)
        collectionView?.register(WorldCell.self, forCellWithReuseIdentifier: worldCellId)
collectionView?.isPagingEnabled = true
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 2
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: view.frame.width, height: view.frame.height)
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        print(indexPath.item)
        let identifier: String
        if indexPath.item == 0 {
            identifier = homeCellId
        } else if indexPath.item == 1 {
            identifier = worldCellId
        }
        else {
            identifier = homeCellId
        }

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath)
        cell.backgroundColor = UIColor.blue
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }
}

MyCell.swift

class MyCell: UICollectionViewCell {

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.setupView()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setupView() {

    }


}

HomeCell.swift

class HomeCell: MyCell {
    let weightField: UITextField = UITextField(frame: .zero)
    override func setupView() {
        super.setupView()
        print("HomeCell")
        weightField.backgroundColor = UIColor.white
        weightField.translatesAutoresizingMaskIntoConstraints = false
        weightField.keyboardType = UIKeyboardType.default
        self.addSubview(weightField)

        weightField.topAnchor.constraint(equalTo: self.topAnchor, constant: 200).isActive = true
        weightField.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 50).isActive = true
    }


}

WorldCell.swift

// 与 HomeCell 相同

class WorldCell: MyCell {

    override func setupView() {
        super.setupView()
        print("worldcell")
    }


}

Answer 1

好的，我已经找到解决这个问题的办法了。我在关于类似事件的 Whosebug 上的其他几个线程中遇到了这个问题，在一个案例中，答案没有归因于它的投票，答案留下的评论说它没有用..

尽管如此，我仍然crystal 不清楚为什么其他实现会导致集合视图向上移动。尽管 window、根视图控制器和它的子视图以及键盘之间存在一些关联。我不知道为什么会这样。

现在开始编写代码并修复..

上述问题中的方法与此处的主要区别在于集合视图的初始化方式。我只会 post 我更改的内容，因为其余部分都是一样的。

AppDelegate.swift

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let rvc = ViewController()

        window? = UIWindow()
        window?.makeKeyAndVisible()
        window?.rootViewController = rvc
        return true
    }
}

这里的显着区别是根视图控制器不再使用集合视图控制器进行初始化。我们使用标准的视图控制器。

ViewController.swift

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

    lazy var collView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .horizontal
        let view = UICollectionView(frame: .zero, collectionViewLayout: layout)
        view.dataSource = self
        view.delegate = self
        return view
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = UIColor.darkGray
        collView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cellId")
        collView.register(HomeCell.self, forCellWithReuseIdentifier: "homeCellId")
        self.view.addSubview(collView)
        collView.backgroundColor = UIColor.blue
        collView.translatesAutoresizingMaskIntoConstraints = false
        collView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        collView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
        collView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
        collView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
        collView.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 1)
        // Do any additional setup after loading the view, typically from a nib.
    }
}

我们使用集合视图作为子视图初始化视图控制器，并将我们通常应用于单元格的相同代码应用

UICollectionView - 当键盘出现时，整个集合视图随键盘移动

UICollectionView - When the keyboard appears the entire collection view is shifted with the keyboard

uitextfield

ios