为什么我的收藏视图单元格不会显示在 iPhone 模拟器中? [英] Why won't my Collection View Cells display in the iPhone Simulator?

问题描述

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.

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.

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 Collection View 从 Object Library 直接放入 IB.另外，我希望每个单元格占据 Collection View 的整个大小，因此 displayedCellDimensions，因为用户会在单元格之间切换点击前进或后退按钮.)谢谢！

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!

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


}
...}

推荐答案

在你看来DidLoad() 试试:

In your viewDidLoad() Try:

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:

You must use these functions in your ViewController class:

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

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

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