IOS10 - 在自定义 inputView 中使用 CollectionView

Question

我正在尝试使用 0 到 9 的数字输入自定义密码，并像这样随机放置一些空键:

这是我的简单 UICollectionViewCell

class KeyboardKeyCollectionViewCell: UICollectionViewCell {
    @IBOutlet var mLabel: UILabel!
}

我的 UIView 包含 UICollectionView(作为测试，我只尝试使用 3 个单元格)

import UIKit
protocol KeyboardDelegate: class {
    func keyWasTapped(character: String)
}

class PasswordKeyboard: UIView , UICollectionViewDataSource , UICollectionViewDelegate {

    @IBOutlet var mCollectionView: UICollectionView!
    weak var delegate: KeyboardDelegate?
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initializeSubviews()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        initializeSubviews()
    }

    func initializeSubviews() {
        let lBundle = Bundle(for: type(of: self))
        let lKeyboardNib = UINib(nibName: "PasswordKeyboard", bundle: lBundle)
        let lCellNib = UINib(nibName: "KeyboardKeyCollectionViewCell", bundle: lBundle)
        let lKeyboardNibView = lKeyboardNib.instantiate(withOwner: self, options: nil).first as! UIView
        self.addSubview(lKeyboardNibView)
        lKeyboardNibView.frame = self.bounds

        mCollectionView.dataSource = self
        mCollectionView.delegate = self

        mCollectionView.register(lCellNib, forCellWithReuseIdentifier: "idgaf")
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
   {
        return 3
   }

   func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "idgaf", for: indexPath as IndexPath) as! KeyboardKeyCollectionViewCell
        cell.mLabel.text = String(describing: indexPath.item) //TODO Randomize this
        return cell
   }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
    {
         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "idgaf", for: indexPath as IndexPath) as! KeyboardKeyCollectionViewCell
        self.delegate?.keyWasTapped(character: cell.mLabel.text!)

    }
}

以及带有将使用该自定义键盘的文本字段的 ViewController

class LoginController: UiViewController  , KeyboardDelegate
{
    func keyWasTapped(character: String) {
        passwordField.insertText(character)
    }

    override func viewDidLoad()
    {
        super.viewDidLoad()
        let keyboardView = PasswordKeyboard(frame: CGRect(x: 0, y: 0, width: 0, height: 300))
        keyboardView.delegate = self 
        passwordField.inputView = keyboardView

    }
}

我目前所做的并没有使我的应用程序崩溃， View 按应有的方式显示并且委托(delegate)被调用是应该的，但是我丢失了我单击的单元格的引用。

我在创建单元格的过程中从调试器获得了一些日志:

在点击第一个单元格之后:

我一直在尝试解决这个问题，但找不到导致此问题的原因。感谢您阅读到此。

Answer 1

不要在您的选择委托(delegate)方法中使单元格出队，而是尝试以这种方式获取单元格。

func cellForItem(at indexPath: IndexPath) -> UICollectionViewCell?



func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
{
     let cell = cellForItem(indexPath) as! KeyboardKeyCollectionViewCell
    self.delegate?.keyWasTapped(character: cell.mLabel.text!)

}

希望对你有帮助