为什么我的Collection View Cells不会在iPhone模拟器中显示？

I am trying to programmatically create a Collection View with six cells. The iPhone Simulator in Xcode 8 told me that my build was successful. There is still an error though.

我试图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，我的构建成功了。但是仍然有一个错误。

Any help spotting the bug or bugs that are causing my cells not to display in the Simulator is greatly appreciated. (I put the Collection View directly into the IB from the Object Library. Also, I want each cell to occupy the entire size of the Collection View, hence displayedCellDimensions, because the user will segue between cells when a forward or backward button is tapped.) Thank you!

任何帮助发现导致我的单元格不在模拟器中显示的错误或错误都非常感谢。（我将集合视图从对象库直接放入IB。此外，我希望每个单元格占据集合视图的整个大小，因此显示了CellDimensions，因为当点击向前或向后按钮时，用户将在单元格之间进行切换。）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


}
...}

1 个解决方案

#1

In your viewDidLoad() Try:

在viewDidLoad（）中尝试：

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

Add this to the top of your class:

将其添加到您的班级顶部：

class FluidIntakeMainMenuViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

You must use these functions in your ViewController class:

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 {}

#1