swift - 为什么我的 UICollectionViewController 不显示任何内容？

Question

我正在尝试让 UICollectionViewController 显示一个单元格网格(稍后我将在其中添加文本，如果可能的话可能作为 textView)。我有:

class GridViewController : UICollectionViewController{

    //(NOW GONE) @IBOutlet weak var gridViewTable = UICollectionViewController()

    let arr1 : [String] = []
    let arr2 : [String] = []


    override func viewDidLoad(){
        super.viewDidLoad()
        self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "gridCell")


    }

   func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        return 4
    }


    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 10
    }




    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell{
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath as IndexPath)
        cell.backgroundColor = UIColor.red
        return cell
    }
}

我使用界面生成器连接白色单元格将转到 gridViewTable 的位置。什么都没有出现，即使它运行和编译。如何让单元格显示？

Answer 1

请使用这些代码:

override func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 4
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 10
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath as IndexPath)
    cell.backgroundColor = UIColor.red
    return cell
}