想通过从firebase下载数据来显示在tableView中添加一个collectionView。 ios App Swift

Question

want to add a UICollectionView inside UITableView by downloading data from firebase to show Now I'm done with the interface part, but I'm stuck in the problem, can't bring data from firebase to show in the UICollectionView .

I can't run collectionView.reloadData() because the UICollectionView is different in class, how should I fix it?

func showImageRewardData(rewardID:String) {
        let databaseRef = Database.database().reference().child("reward").child(rewardID).child("rewardImage")
        databaseRef.observe(DataEventType.value, with: { (Snapshot) in
            if Snapshot.childrenCount>0{
                self.rewardDataArr.removeAll()
                for rewardImage in Snapshot.children.allObjects as! [DataSnapshot]{
                    let rewardObject = rewardImage.value as? [String: AnyObject]

                    if(rewardObject?["imageURL"] != nil){
                        let imageUrl = rewardObject?["imageURL"]
                        let Data = rewardDetailClass(rewardImage: imageUrl as? String)
                        self.rewardDataArr.insert(Data, at: 0)          
                    }

Answer 1

YOURVIEWCONTROLLER.SWIFT

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let CellIdentifier: String = "Cell_NotesList"
    var cell: Cell_NotesList? = (tableView.dequeueReusableCell(withIdentifier: CellIdentifier) as? Cell_NotesList)

    if cell == nil {
        let topLevelObjects: [Any] = Bundle.main.loadNibNamed("Cell_NotesList", owner: nil, options: nil)!
        cell = (topLevelObjects[0] as? Cell_NotesList)
        cell?.selectionStyle = .none
    }
    cell?.reloadCollectionView(arr: arrofofthumbImages)
    return cell!
}

YourCell.SWIFT

class Cell_NotesList: UITableViewCell {

    var imagesArr = NSMutableArray()

    override func awakeFromNib() {
        collectionView.register(UINib.init(nibName: "cell_ImageCollection", bundle: nil), forCellWithReuseIdentifier: "cell_ImageCollection")
        super.awakeFromNib()
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        // Configure the view for the selected state
    }
}



extension Cell_NotesList : UICollectionViewDataSource {

    func reloadCollectionView(arr:NSMutableArray) {
        imagesArr = arr
        collectionView.reloadData()
        self.layoutIfNeeded()
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return imagesArr.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell : cell_ImageCollection? = collectionView.dequeueReusableCell(withReuseIdentifier: "cell_ImageCollection", for: indexPath) as? cell_ImageCollection
        //YOUR CODE HERE
        return cell!
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    }
}

extension Cell_NotesList : UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 120.0, height: 120.0)
    }
}

extension UICollectionViewCell {
    var indexPath: IndexPath? {
        return (superview as? UICollectionView)?.indexPath(for: self)
    }
}

Answer 2

In class that extends UICollectionView , put one setter method like

func setData(data: String){
    // Update your cell view here like
    Label.text = data
}