在集合视图中追加2个数组

Question

所以我有2个数组，1个是photoPost数组，另一个是videoPost数组。现在是否可以同时在一个集合视图中显示这两个数组？我尝试使用下面的方法，但没有成功。我不确定我是否做得对。我们将不胜感激。提前致谢

var photoPosts = [photoPost]()
var videoPosts = [videoPost]()

func retrieveData(){
let ref = Database.database().reference().child("videoPost").child(uid)
        ref.observe(.childAdded, with: { (snapshot) in
            let dictionary = videoPost(snapshot: snapshot)
            self.videoPosts.append(dictionary)
 })
let ref = Database.database().reference().child(“photoPost").child(uid)
        ref.observe(.childAdded, with: { (snapshot) in
            let dictionary = photoPost(snapshot: snapshot)
            self. photoPosts.append(dictionary)
})
 self.newsfeedCollectionView?.reloadData()
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
 return videoPosts.count + photoPosts.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {         
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! newsfeedCollectionViewCell
       cell. photoPost = photoPosts[indexPath.item]
       cell.videoPost = videoPosts[indexPath.item] // fatal error:index out of range 
        return cell
    }

Answer 1

请试试这个

       func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {         
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! newsfeedCollectionViewCell
         if indexPath.item < photoPosts.count {
            cell. photoPost = photoPosts[indexPath.item]
           } else {
             cell.videoPost = videoPosts[indexPath.item-photoPosts.count]
             }
            return cell
            }