我希望将一个collectionview作为另一个集合视图单元格的一部分,但不知道如何实现。在哪里可以实现单元格collectionview所需的方法?
我希望将一个collectionview作为另一个集合视图单元格的一部分,但不知道如何实现。在哪里可以实现单元格collectionview所需的方法?
有Ash Furrow写的一篇文章解释如何将UICollectionView
放置在UITableViewCell
中。当在UICollectionViewCell
中使用它时,基本上是相同的思路。
所有东西都是以编程方式完成的。没有故事板。
我在我的UICollectionViewCell中添加了一个UICollectionView。我还展示了如何再次添加一个UICollectionViewCell到已创建的UICollectionView中,以实现这个结果
import UIKit
class CategoryCell: UICollectionViewCell, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
private let cellId = "cell"
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let appsCollectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
return collectionView
}()
func setupViews() {
backgroundColor = .blue
addSubview(appsCollectionView)
appsCollectionView.delegate = self
appsCollectionView.dataSource = self
appsCollectionView.register(AppCell.self, forCellWithReuseIdentifier: cellId)
addConstrainstWithFormat("H:|-8-[v0]-8-|", views: appsCollectionView)
addConstrainstWithFormat("V:|[v0]|", views: appsCollectionView)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 5
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath)
return cell
}
}
class AppCell: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupViews(){
backgroundColor = .red
}
}
我的UICollectionViewController
import UIKit
class FeaturedAppsController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
let cellId = "cell"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
collectionView?.backgroundColor = .white
collectionView?.register(CategoryCell.self, forCellWithReuseIdentifier: cellId)
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(view.frame.width, 150)
}
}
整个解释可以在“让我们构建这个应用程序”中找到并开发:https://www.youtube.com/watch?v=Ko9oNhlTwH0&list=PL0dzCUj1L5JEXct3-OV6itP7Kz3tRDmma
UICollectionViewCell
中嵌套另一个UICollectionView
。mainCollectionView
。然后,在此集合的每个单元格中创建和初始化一个新的UICollectionView
。此操作最佳放在UICollectionView
的以下委托方法中:
func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath)
例如,在这里我初始化了MainCollectionViewCell
,并让MainCollectionViewCell
处理创建新UICollectionView
的逻辑。guard let collectionViewCell = cell as? MainCollectionViewCell else { return }
collectionViewCell.delegate = self
let dataProvider = ChildCollectionViewDataSource()
dataProvider.data = data[indexPath.row] as NSArray
let delegate = ChildCollectionViewDelegate()
collectionViewCell.initializeCollectionViewWithDataSource(dataProvider, delegate: delegate, forRow: indexPath.row)
collectionViewCell.collectionViewOffset = storedOffsets[indexPath.row] ?? 0
MainCollectionViewCell
上创建一个新的 UICollectionView
的初始化程序。func initializeCollectionViewWithDataSource<D: protocol<UICollectionViewDataSource>,E: protocol<UICollectionViewDelegate>>(dataSource: D, delegate :E, forRow row: Int) {
self.collectionViewDataSource = dataSource
self.collectionViewDelegate = delegate
let flowLayout = UICollectionViewFlowLayout()
flowLayout.scrollDirection = .Horizontal
let collectionView = UICollectionView(frame: self.bounds, collectionViewLayout: flowLayout)
collectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseChildCollectionViewCellIdentifier)
collectionView.backgroundColor = UIColor.whiteColor()
collectionView.dataSource = self.collectionViewDataSource
collectionView.delegate = self.collectionViewDelegate
collectionView.tag = row
self.addSubview(collectionView)
self.collectionView = collectionView
collectionView.reloadData()
}
希望能对您有所帮助!
我在 GitHub 上做了一个示例,演示了如何在 UICollectionViewCell
中使用 UICollectionView
。
https://github.com/irfanlone/Collection-View-in-a-collection-view-cell
使用Storyboard和Swift 5实现CollectionView嵌套CollectionView的最简单解决方案
import UIKit
class ParentViewController:UIViewController,UICollectionViewDataSource,UICollectionViewDelegate {
//MARK: Declare variable
//MARK: Decalare outlet
@IBOutlet weak var outerCollectionView: UICollectionView!
@IBOutlet weak var pageControl: UIPageControl!
let outerCount = 4
//MARK: Decalare life cycle methods
override func viewDidLoad() {
super.viewDidLoad()
pageControl.numberOfPages = outerCount
}
//MARK: Collection View delegate methods
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return outerCount
}
//MARK: Collection View datasource methods
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "OuterCell", for: indexPath) as! OuterCollectionViewCell
cell.contentView.backgroundColor = .none
return cell
}
//MARK:- For Display the page number in page controll of collection view Cell
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let visibleRect = CGRect(origin: self.outerCollectionView.contentOffset, size: self.outerCollectionView.bounds.size)
let visiblePoint = CGPoint(x: visibleRect.midX, y: visibleRect.midY)
if let visibleIndexPath = self.outerCollectionView.indexPathForItem(at: visiblePoint) {
self.pageControl.currentPage = visibleIndexPath.row
}
}
}
class OuterCollectionViewCell: UICollectionViewCell ,UICollectionViewDataSource,UICollectionViewDelegate {
@IBOutlet weak var InnerCollectionView: UICollectionView!
override func awakeFromNib() {
super.awakeFromNib()
InnerCollectionView.delegate = self
InnerCollectionView.dataSource = self
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
6
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "InnerCell", for: indexPath) as! InnerCollectionViewCell
cell.contentView.backgroundColor = .green
return cell
}
}
class InnerCollectionViewCell: UICollectionViewCell{
}