Question

我正在尝试在视图控制器中使用两个集合视图，因此我收到此错误消息？你能指出我错过了什么来纠正这个问题吗？提前致谢.. 下面是名为＆＃34; OtherViewController＆＃34;。

的视图控制器中的代码

类OtherViewController：UIViewController，UICollectionViewDataSource，UICollectionViewDelegate {

//1. CREATE A VARIABLE FOR YELLOW ARRAY SO THAT I CAN DEFINE A STRING
var exploreArray = [String]()
var exploreHeader = [String]()
var yellowImages = [String]()
var explorecategories = [String]()


@IBOutlet weak var mycollectionView: UICollectionView!


var collectionViewA = UICollectionView()
let collectionViewB = UICollectionView()
let collectionViewAIdentifier = "yellowCell"
let collectionViewBIdentifier = "yellowCell2"

 override func viewDidLoad() {
    super.viewDidLoad()


    // Do any additional setup after loading the view.

        collectionViewA.delegate = self
        collectionViewB.delegate = self

        collectionViewA.dataSource = self
        collectionViewB.dataSource = self


        self.view.addSubview(collectionViewA)
        self.view.addSubview(collectionViewB)

}

func collectionView（_ collectionView：UICollectionView，numberOfItemsInSection section：Int） - ＆gt; Int {

   if collectionView == self.collectionViewA {
         return exploreArray.count        }

    return 1 // Replace with count of your data for collectionViewB

} 
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
   if collectionView == self.collectionViewA{

        let cellA = collectionView.dequeueReusableCell(withReuseIdentifier: "yellowCell", for: indexPath) as! yellowCell
                // Set up cell

    //DISPLAY TITLE LABEL
    cellA.yLabel.text = exploreHeader[indexPath.row]

    //DISPLAY IMAGES
    cellA.yellowImages.image  = UIImage(named:yellowImages [indexPath.row])

    //DISPLAY DESCRIPTION
    cellA.yellowTextField.text = exploreArray [indexPath.row]

    return cellA
    }

    else {

       let cellB =  collectionView.dequeueReusableCell(withReuseIdentifier: "yellowCell2", for: indexPath) as! yellowCell2

    cellB.labe2.text = "Dolphin"

//只是radom标签来查看cellB是否会出现在集合视图中

               return cellB
    }

    }

Answer 1

我认为this question给出的答案也可能对您的情况有所帮助。

具体来说，你在哪里

var collectionViewA = UICollectionView()
let collectionViewB = UICollectionView()

建议（由比我更聪明的几个人）改为使用

var collectionViewA: UICollectionView!
var collectionViewB: UICollectionView!

然后在viewDidLoad（）中，设置委托和dataSource（就像你一样），添加类似

的内容

let layoutA = UICollectionViewFlowLayout()                  
layoutA.itemSize = CGSize(width: 100, height: 100)

let layoutB = UICollectionViewFlowLayout()
layoutB.itemSize = CGSize(width: 100, height: 100)

collectionViewA = UICollectionView(frame: self.view.frame, collectionViewLayout: layoutA)
collectionViewB = UICollectionView(frame: self.view.frame, collectionViewLayout: layoutB)

然后在添加子视图后最终

collectionViewLeft.register(UICollectionViewCell.self, forCellWithReuseIdentifier: collectionViewLeftIdentifier)
collectionViewRight.register(UICollectionViewCell.self, forCellWithReuseIdentifier: collectionViewRightIdentifier)

完整代码显示在链接问题的答案中。（它使用左和右而不是A＆amp; B，但希望同样的想法适用。）

必须使用非零布局参数初始化UICollectionView＆＃39;

1 个答案: