Question

我正在构建具有自定义键盘的应用程序。

在班级里，我创建了集合视图，这是代码：

class KeyboardViewController: UIInputViewController, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource, UICollectionViewDelegate {

let stickerImages = [
    UIImage(named: "Image-1"),
    UIImage(named: "Image-2"),
    UIImage(named: "Image-3"),
    UIImage(named: "Image-4"),
    UIImage(named: "Image-5")
]

@IBOutlet var nextKeyboardButton: UIButton!
@IBOutlet var collectionView: UICollectionView!

override func updateViewConstraints() {
    super.updateViewConstraints()
}

override func viewDidLoad() {
    super.viewDidLoad()

    let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
    layout.scrollDirection = UICollectionView.ScrollDirection.vertical
    layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
    layout.itemSize = CGSize(width: 50, height: 50)

    collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
    collectionView.dataSource = self
    collectionView.delegate = self
    collectionView.register(StickersCell.self, forCellWithReuseIdentifier: StickersCell.reuseIdentifier)
    collectionView.backgroundColor = UIColor.white
    collectionView.showsHorizontalScrollIndicator = false
    collectionView.backgroundColor = UIColor.red

    collectionView.translatesAutoresizingMaskIntoConstraints = false

    self.view.addSubview(collectionView)

    self.nextKeyboardButton = UIButton(type: .system)

    self.nextKeyboardButton.setTitle(NSLocalizedString("Next Keyboard", comment: "Title for 'Next Keyboard' button"), for: [])
    self.nextKeyboardButton.sizeToFit()
    self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false
    self.nextKeyboardButton.backgroundColor = UIColor.white

    self.nextKeyboardButton.addTarget(self, action: #selector(handleInputModeList(from:with:)), for: .allTouchEvents)

    self.view.addSubview(self.nextKeyboardButton)

    self.nextKeyboardButton.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
    self.nextKeyboardButton.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true

    self.collectionView.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
    self.collectionView.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
    self.collectionView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
    self.collectionView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
}

override func textWillChange(_ textInput: UITextInput?) {
    // The app is about to change the document's contents. Perform any preparation here.
}

override func textDidChange(_ textInput: UITextInput?) {
    // The app has just changed the document's contents, the document context has been updated.

    var textColor: UIColor
    let proxy = self.textDocumentProxy
    if proxy.keyboardAppearance == UIKeyboardAppearance.dark {
        textColor = UIColor.white
    } else {
        textColor = UIColor.black
    }
    self.nextKeyboardButton.setTitleColor(textColor, for: [])
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    return stickerImages.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: StickersCell.reuseIdentifier, for: indexPath) as! StickersCell

    cell.setImage(stickerImages[indexPath.item]!)

    return cell
}}

这是我的“收藏夹视图”单元格类：

class StickersCell: UICollectionViewCell {

static let reuseIdentifier: String = "StickersCell"

lazy var imageView: UIImageView = {
    let imageView = UIImageView(frame: .zero)
    imageView.contentMode = .scaleAspectFit
    imageView.translatesAutoresizingMaskIntoConstraints = false
    return imageView
}()

override init(frame: CGRect) {
    super.init(frame: frame)
    contentView.clipsToBounds = true
    contentView.addSubview(imageView)

    imageView.leftAnchor.constraint(equalTo: contentView.leftAnchor).isActive = true
    imageView.rightAnchor.constraint(equalTo: contentView.rightAnchor).isActive = true
    imageView.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true
    imageView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true
}

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

func setImage(_ image: UIImage) {
    imageView.image = image
}}

在将集合视图添加到任何UIView或UIViewController时，此代码工作得很好，但是在尝试将其添加到键盘时会引发以下错误：

据我了解，我将约束设置为错误的，但是我不明白到底是什么错误，特别是当它在简单视图或视图控制器中正常工作时。

我用Google搜索了分配，找不到任何解决方案... 同样，这样的问题也无济于事：

我还尝试过将创建集合视图的代码移至viewDidAppear和viewWillAppear方法中，但是没有运气。

另一个奇怪的事情：如果我在键盘上添加具有相同约束的简单UIView-一切正常。问题似乎与收藏夹视图有关。

那么，我错过了什么？非常感谢您的帮助，因为我已经在与这个问题作斗争了一个多星期...

更新：

在阅读Apple开发人员论坛后，我想到了一个主意：我之前创建过与UITableView相同的UICollectionView，但很奇怪。因此，下一个问题是： 您完全可以使用UICollectionView作为自定义键盘吗？

Answer 1

在解决了2个星期的问题后，终于找到了解决方法：

由于某些原因，您不能像在iMessage Extension中一样在UIImageView中使用MSStickerView或UICollectionViewCell，所以我只是在{{1}中添加了透明UIButton }放在此按钮中，就可以了！

仍然不知道为什么您不能使用图像或视图并且找不到有关它的任何特定信息，但是我的解决方案有效，我希望这会在将来对您有所帮助。

集合视图作为自定义键盘不起作用

1 个答案: