我在為表視圖內部的集合視圖進行頁面控制作業時遇到問題。視圖控制器中實際上有 2 個集合視圖，一個在 tableView 外部，一個在內部。我想要一個內部的頁面控制。讓我在下面分享代碼，然后解釋導致問題的原因：
class HomeViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
override func viewDidLoad() {
super.viewDidLoad()
//setup stories collection view
let nib = UINib(nibName: "StoryCollectionViewCell", bundle: nil)
cvStories.register(nib, forCellWithReuseIdentifier: "StoryCollectionViewCell")
let layout1 = UICollectionViewFlowLayout()
layout1.scrollDirection = .horizontal
layout1.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
collectionViewStories.setCollectionViewLayout(layout1, animated: true)
collectionViewStories.delegate = self
collectionViewStories.dataSource = self
tblHome.dataSource = self
tblHome.delegate = self
}
// MARK: - Table View
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tblHome.dequeueReusableCell(withIdentifier: "HomeTableViewCell", for: indexPath) as! HomeTableViewCell
cell.collectionViewPostImages.dataSource = self
cell.collectionViewPostImages.delegate = self
cell.collectionViewPostImages.tag = indexPath.row
cell.collectionViewPostImages.reloadData()
cell.pageControl.hidesForSinglePage = true
cell.pageControl.numberOfPages = self.posts[cell.collectionViewPostImages.tag].imagesArray?.count ?? 0
return cell
}
//MARK: - Collection View
func numberOfSections(in collectionView: UICollectionView) -> Int {
if collectionView == cvStories {
return 2
}
else {
return 1
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == collectionViewStories {
return stories.count
}
else {
return posts[collectionView.tag].imagesArray?.count ?? 0
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == collectionViewStories {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "StoryCollectionViewCell", for: indexPath) as! StoryCollectionViewCell
//code to show stories
return cell
}
else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "HomeCollectionViewCell", for: indexPath) as! HomeCollectionViewCell
//code to show images
return cell
}
}
}
//TableViewCell Class
class HomeTableViewCell: UITableViewCell {
@IBOutlet weak var collectionViewPostImages: UICollectionView!
@IBOutlet weak var pageControl: UIPageControl!
var currentPage = 0
override func awakeFromNib() {
let flowLayout = UICollectionViewFlowLayout()
flowLayout.itemSize = CGSize(width: UIScreen.main.bounds.size.width, height: cvPostImages.frame.size.height)
flowLayout.scrollDirection = .horizontal
flowLayout.minimumInteritemSpacing = 0
flowLayout.minimumLineSpacing = 0
collectionViewPostImages?.collectionViewLayout = flowLayout
collectionViewPostImages.showsHorizontalScrollIndicator = false
collectionViewPostImages.isPagingEnabled = true
}
//ScrollView delegate method
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let pageWidth = scrollView.frame.width
self.currentPage = Int((scrollView.contentOffset.x pageWidth / 2) / pageWidth)
self.pageControl.currentPage = self.currentPage
}
}
The whole code is like Instagram app, stories at top and posts with images in tableView. Whole code is in single View controller and everything works fine. Even dots (page number) are correct according to number of pages however when you swipe between them they do not change. I saw many solutions and in those pageControl.numberOfPages was used in cellForItemAt function but its out of scope for me so I just called it as cell.pageControl.numberOfPages in cellForRowAt instead. First time dealing with collectionView inside tableView so getting confused getting it worked.
uj5u.com熱心網友回復：
主要問題是您使用cell.collectionViewPostImages.delegate = selfinHomeViewController但您的方法scrollViewDidScroll在 cell 中HomeTableViewCell。
Collectionview 自己的滾動視圖委托方法在UICollectionViewDelegate. 這就是為什么scrollViewDidScroll沒有在您的單元格中觸發。
解決方案是scrollViewDidScroll在您洗掉集合視圖的地方使用。它是HomeViewController
順便說一句，我不建議
cell.collectionViewPostImages.dataSource = self cell.collectionViewPostImages.delegate = self在可重復使用的單元格中使用。您不想...delegate = self每次重復使用單元格時都進行操作。你可以awakeFromNib在牢房上課
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標籤：swift xcode uitableview uicollectionview uipagecontrol