ios - UICollectionViewCell 不出现

Question

如何使 UICollectionViewCell 出现？ CollectionView 背景确实出现，但单元格没有出现，但我不明白为什么不出现。请检查此代码。 Full source code is here (github)

class itemsCollectionView: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

var myItemCollectionView: UICollectionView!

override func viewDidLoad() {
    view.backgroundColor = UIColor.redColor()

    let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()

    layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    layout.itemSize = CGSizeMake(50, 50)
    layout.minimumInteritemSpacing = CGFloat(5.0)
    layout.scrollDirection = .Horizontal

    myItemCollectionView = UICollectionView(frame: CGRectMake(5, 5, 300, 100), collectionViewLayout: layout)
    myItemCollectionView.dataSource = self
    myItemCollectionView.delegate = self
    myItemCollectionView.registerClass(ItemCell.self, forCellWithReuseIdentifier: CELLID)
    myItemCollectionView.backgroundColor = UIColor.darkGrayColor()

    self.view.addSubview(myItemCollectionView)
}

Answer 1

Collection View 的委托(delegate)/数据源方法未在“itemsCollectionView”中调用。我只是暂时更改了 ItemGroupCell 中的 itemsCollectionView 调用及其工作

在ItemGroupCell中添加 View Controller 变量

let itemVC : UIViewController = {

     let itemCollectionView = itemsCollectionView()
     return itemCollectionView
}()

像这样更改MainViewController中的“cellForItemAtIndexPath”

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

    let groupCell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifierID, forIndexPath: indexPath) as! ItemGroupCell

     //        if let groupName = groupMenu[indexPath.item].groupName    {
     //            groupCell.groupName.text = groupName
     //        }   

    // Configure the cell

    groupCell.Info = groupInfo[indexPath.item]

    groupCell.addSubview(groupCell.itemVC.view)
    groupCell.addConstraintsWithFormat("H:|-15-[v0]-15-|", views: groupCell.itemVC.view)

    return groupCell
}

希望它能正常工作...