Swift：称重传感器位于 UICollectionView 的正确部分？

Question

我正在将两个相同类型的对象加载到两个单独的数组中。第一个数组是 [Post] 类型，第二个数组也是。我的 collectionView 中有两个部分，我想将第一个数组加载到第一部分，将第二个数组加载到第二部分。我正在从 firebase 获取数据并将对象附加到数组中。在我的 numberOfItemsInSection 中，我正在检查该部分是否等于一个，加载第一个，如果该部分等于两个，则加载第二个。这工作正常，但问题是它只在每个部分加载正确数量的单元格，但没有加载正确的信息。它只是从第一个数组加载先前获取的数据。我该如何解决这个问题？谢谢...

class ProfileController: UICollectionViewController, UICollectionViewDelegateFlowLayout {

    var name: String?

    var posts = [Post]()
    var repost = [Post]()

    override func viewDidLoad() {
        super.viewDidLoad()

        collectionView?.register(PostCell.self, forCellWithReuseIdentifier: reuseIdentifier)
        collectionView?.register(ProfileHeader.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: headerIdentifier)
        collectionView?.register(RepostedHeader.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: boostedHeaderIdentifier)

        self.posts.removeAll()
        self.repost.removeAll()

        handleFetchUserPosts { self.collectionView?.reloadData() }
        handleFetchUserReposts { self.collectionView?.reloadData() }
    }

    override func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 2
    }

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        if section == 0 {
            return posts.count
        } else {
            return reposts.count
        }
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        if section == 0 {
            return CGSize(width: view.frame.width, height: 180)
        } else {
            return CGSize(width: view.frame.width, height: 30)
        }
    }

    override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

        if indexPath.section == 0 {
            let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: headerIdentifier, for: indexPath) as! ProfileHeader
            header.profileController = self
            return header
        } else {
            let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: boostedHeaderIdentifier, for: indexPath) as! RepostedHeader
            return header
        }

    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {            
        return CGSize(width: width, height: height)
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PostCell

        cell.profileController = self

        let posts = self.posts[indexPath.item]
        let reposts = self.reposts[indexPath.item]

        if self.posts != [] {
            cell.post = posts
        }

        if self.posts != [] {
            cell.post = reposts
        }

        return cell
    }
}

Answer 1

 override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PostCell

    cell.profileController = self

    if indexPath.section == 0 {
        let posts = self.posts[indexPath.item]
        if self.posts != [] {
            cell.post = posts
        }
    }

    if indexPath.section == 1 {
        let reposts = self.reposts[indexPath.item]
        if self.posts != [] {
            cell.post = reposts
        }
    }

    return cell
}

我认为如果不使用它，这将解决您的问题，实际上这是一种相同的代码，但如果您的对象有多个单元格，这将派上用场

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    var cell = PostCell()

    if indexPath.section == 0 {
        cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PostCell
        cell.profileController = self
        let posts = self.posts[indexPath.item]
        if self.posts != [] {
            cell.post = posts
        }
    }

    if indexPath.section == 1 {
        cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PostCell
        let reposts = self.reposts[indexPath.item]
        if self.posts != [] {
            cell.post = reposts
        }
    }

    cell.profileController = self

    return cell
}

希望这会有所帮助

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