ios - 在swift中将 'n'号 Collection View 添加到UIStackView

Question

我有一个 ViewController 类，我在其中放置 scrollView 并添加 stackView 作为 subview 。现在我想在 stackView 中添加 'n' 个 collectionView 。我正在从服务器获取数据，会有不同的类别。如果类别 A 有数据，那么我需要为其创建一个 collectionView。我需要在其类本身中处理相应的collectionView 的数据。

class ViewController: UIViewController {

var scrollView : UIScrollView!
var stackView : UIStackView!
var responseFullData : JsonFullDataResponse!
var responseData : JsonResponse!

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    print("View Controller init")
    super.init(nibName: nil, bundle: nil)
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

override func viewDidAppear(_ animated: Bool) {
    print("View did appear")
    scrollView.contentSize = CGSize(width: stackView.frame.width, height: stackView.frame.height)
}

override func viewDidLoad() {
    super.viewDidLoad()

    //loading all the data
    loadAllJsonData()

    //setting up scroll and stack views
    setUpScrollAndStackView()
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    print("inside layout")
    scrollView.contentSize = CGSize(width: stackView.frame.width, height: stackView.frame.height)
}

func setUpScrollAndStackView() {
    scrollView = UIScrollView()
    scrollView.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(scrollView)

    view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[scrollView]|", options: .alignAllCenterX, metrics: nil, views: ["scrollView": scrollView]))
    view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[scrollView]|", options: .alignAllCenterX, metrics: nil, views: ["scrollView": scrollView]))

    stackView = UIStackView()
    stackView.translatesAutoresizingMaskIntoConstraints = false
    stackView.spacing = 20.0
    stackView.axis = .vertical
    scrollView.addSubview(stackView)


  scrollView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[stackView]|", options: NSLayoutFormatOptions.alignAllCenterX, metrics: nil, views: ["stackView": stackView]))
  scrollView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[stackView]", options: NSLayoutFormatOptions.alignAllCenterX, metrics: nil, views: ["stackView": stackView]))

    setUpOtherViewsInStack()
}

func setUpOtherViewsInStack() {
    if responseFullData.banner?.count != 0 {
        print("banner has data")

        var bannerCollection : BannerCollectionView = BannerCollectionView() as! BannerCollectionView
        bannerCollection.register(UINib.init(nibName: "BannerCell", bundle: nil), forCellWithReuseIdentifier: "BannerCell")
        stackView.addArrangedSubview(bannerCollection)
   }
}

BannerCollectionView 代码

class BannerCollectionView: UICollectionView , UICollectionViewDataSource{

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
        print("control is in datasource")
        return 5
    }

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

我该如何进行这项工作。我应该在哪个类中以及哪里设置 BannerCollectionView 的 delegate 和 datasource 属性？我如何初始化它？

Answer 1

据我了解，您需要从0开始for来计数responseFullData.banner.count每次添加collectionView

if let count = responseFullData.banner?.count {
    for i in 0..<count {
        var bannerCollection : BannerCollectionView = BannerCollectionView() as! BannerCollectionView
        bannerCollection.register(UINib.init(nibName: "BannerCell", bundle: nil), forCellWithReuseIdentifier: "BannerCell")
        stackView.addArrangedSubview(bannerCollection)
    }
}