为什么我的收藏视图单元格不会显示在 iPhone 模拟器中？

Question

我正在尝试以编程方式创建一个包含六个单元格的集合视图。 Xcode 8 中的 iPhone 模拟器告诉我构建成功。 仍然有错误。

非常感谢您发现导致我的单元格不显示在模拟器中的错误或错误的任何帮助。 （我将集合视图从对象库直接放入 IB。另外，我希望每个单元格占据集合视图的整个大小，因此 displayedCellDimensions，因为当前进或后退按钮时，用户将在单元格之间切换轻拍。）谢谢！

import UIKit

class FluidIntakeMainMenuViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {



//MARK: - Collection View Properties
@IBOutlet weak var ibCollectionView: UICollectionView!

var cellArray:[customCollectionViewCell] = Array(repeating: customCollectionViewCell(), count: 6)

let displayedCellDimensions = CGSize(width: 343, height: 248)



//MARK: - Xcode-generated Methods
override func viewDidLoad() {
    super.viewDidLoad()


    // Do any additional setup after loading the view.
    ibCollectionView.dataSource = self
    ibCollectionView.delegate = self


}

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

//MARK: - Collection View Methods
//Place cells in collection view and change the cell size
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    if collectionView.visibleCells.isEmpty {
        for cell in 0...cellArray.count {
            collectionView.addSubview(cellArray[cell])
            return CGSize(width: 343, height: 248)
        }
    }
    return CGSize(width: 343, height: 248)
}

//Register a new cell
func registerCell(_ collectionView: UICollectionView) {
    for _ in 0...cellArray.count {
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
    }
}



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

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
    return cell
}

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

    return cellArray.count


}
...}

Answer 1

在你的 viewDidLoad() 中尝试：

viewDidLoad() {
ibCollectionView.dataSource = self
ibCollectionView.delegate = self
}

将此添加到班级顶部：

class FluidIntakeMainMenuViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

您必须在 ViewController 类中使用这些函数：

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

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {}