FirebaseUI Firestore 未在 iOS 上检索数据

Question

FirebaseUI-Firestore documentation 的 iOS 不是很彻底，我已经实现了代码，但我的集合视图没有被填充：

class HomeViewController:UIViewController {

@IBOutlet weak var collectionView: UICollectionView!

var firestore:Firestore = Firestore.firestore()

override func viewDidLoad() {
    super.viewDidLoad()

    let query = firestore.collection("/offers")

    let dataSource = collectionView.bind(toFirestoreQuery: query) { (collectionView, indexPath, documentSnapshot) -> UICollectionViewCell in
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! OfferHolderCollection
        print("POPULATING")
        cell.myLabel?.text = documentSnapshot.data()?["name"] as? String
        return cell
    }        
}

在Android上，adapter.startListening()方法将被放置在onResume()中以开始检索数据，但iOS似乎没有这样的方法。上面的代码是否足以开始检索数据？

Answer 1

发现我的错误。来自 FirebaseUI 源码评论：

* The returned data source is not retained by the collection view and must be
* retained or it will be deallocated while still in use by the collection view.

事实上，文档示例确实将其存储在 self.datasource 中，而我的代码将其存储在本地。因此，通过使数据源成为 ViewController.

的成员来解决此问题

FirebaseUI Firestore 未在 iOS 上检索数据

FirebaseUI Firestore not retrieving data on iOS

ios

firebase

firebaseui

google-cloud-firestore