包含空内容的集合视图，即使定义了协议和委托

Question

下面是包含 CollectionView 及其属性的 Triggered viewController：

 import UIKit

struct CellModel {
    let imgImage: UIImage
    let carNumber: String
    let locationInfo: String
    let modifiedDate: String
    let modifiedBy: String

}

class MerchandizeEntranceViewController: UIViewController {


    let data: [CellModel] = [CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim"),CellModel(imgImage: UIImage(imageLiteralResourceName: "car"), carNumber: "11, 23, 34", locationInfo: "Seoul, South Korea", modifiedDate: "12-01-2020 at 6:30pm", modifiedBy: "Mr.Kim")]



    let idCell = "idCell"
    @IBOutlet weak var customCollectionView: UICollectionView!
    @IBOutlet weak var addButton: UIButton!



    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = .cyan
        customCollectionView?.dataSource = self
        customCollectionView?.delegate = self
       customCollectionView?.register(CustomCell.self, forCellWithReuseIdentifier: idCell)





    }

}





class CustomCell: UICollectionViewCell {

    @IBOutlet weak var imgImage: UIImageView!
    @IBOutlet weak var carNumber: UILabel!
    @IBOutlet weak var locationInfo: UILabel!
    @IBOutlet weak var modifiedDate: UILabel!
    @IBOutlet weak var modifiedBy: UILabel!


    public func configModel(with model: CellModel ) {

        imgImage?.image = model.imgImage
        carNumber?.text = model.carNumber
        locationInfo?.text = model.locationInfo
        modifiedDate?.text = model.modifiedDate
        modifiedBy?.text = model.modifiedBy
    }

}

extension MerchandizeEntranceViewController: UICollectionViewDelegate {

}

extension MerchandizeEntranceViewController: UICollectionViewDelegateFlowLayout {
    private func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

        return CGSize(width: 384, height: 100)

    }
}

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

        return data.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: idCell, for: indexPath) as! CustomCell
        cell.configModel(with: data[indexPath.row])

        return cell
    }


}

下面是“didSelectItemAt indexpath:”在我的 mainViewController 中调用的方法，它触发了DetailedViewcontrolers（上面的 ViewController 内容）显示了它们的内容：

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    if let cell_Menu = collectionView.dequeueReusableCell(withReuseIdentifier: "menuCell", for: indexPath) as? MenuCell {
        switch indexPath.row {
        case 0:
            self.performSegue(withIdentifier: "segue0", sender: AnyClass.self)
        case 1:
            self.performSegue(withIdentifier: "segue1", sender: AnyClass.self)
        case 2:
            self.performSegue(withIdentifier: "segue2", sender: AnyClass.self)
        case 3:
            self.performSegue(withIdentifier: "segue3", sender: AnyClass.self)
        case 4:
            self.performSegue(withIdentifier: "segue4", sender: AnyClass.self)
        case 5:
            self.performSegue(withIdentifier: "segue5", sender: AnyClass.self)
        case 6:
            self.performSegue(withIdentifier: "segue6", sender: AnyClass.self)


        default: NSLog("no view is defined for this cell")

        }
    } else {
        if let cell_Story = collectionView.dequeueReusableCell(withReuseIdentifier: "storyCell", for: indexPath) as? StoryCell {
            switch indexPath.row {
            case 0:
                NSLog("No addidtional view defined for story cell yet.. .")
            default: break

            }
        }

    }

}

如果这段代码流有任何问题，任何人都可以查看并纠正我..肯定有问题..

Answer 1

让我举个例子，假设您正在使用原型单元并在代码上注册，您不会使用相同的类来构造它们。已注册单元的类将没有任何 IBOutlet（没有来自情节提要）：

let regCell = "regCell"
...
customCollectionView.register(RegCell.self, forCellWithReuseIdentifier: regCell)
...
class RegCell: UICollectionViewCell {
    var textField = UITextField()

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

        contentView.addSubview(textField)
        textField.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            ...
        ])
    }

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

而且，在同一个项目中，您决定使用原型单元：

class ProCell: UICollectionViewCell {
    @IBOutlet var label: UILabel!
}

要处理这两种不同类型的单元实现，您的cellForItemAt 可以是：

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    if indexPath.row % 2 != 0 {
        // Setting Registered cells
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: regCell, for: indexPath) as! RegCell
        cell.textField.placeholder = "Registered Cell"

        return cell
    } else {
        // Setting Prototypes cells
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: proCell, for: indexPath) as! ProCell
        cell.backgroundColor = .gray
        cell.label.text = "Prototype"

        return cell
    }
}

这只是一个实现示例，您可以在同一个 collectionView 上使用这些单元格，也可以不使用。希望我能帮上忙:)