FireStore Swift 4:如何获取集合中所有文档的总数，并获取每个文档的详细信息？

import Firebase

let db = Firestore.firestore()
let collectionRef = db.collection("your_collection_name")

collectionRef.getDocuments { (snapshot, error) in
    if let error = error {
        print("Error getting documents: \(error)")
    } else {
        if let snapshot = snapshot {
            let documentCount = snapshot.documents.count
            print("Total document count: \(documentCount)")
        }
    }
}

collectionRef.getDocuments { (snapshot, error) in
    if let error = error {
        print("Error getting documents: \(error)")
    } else {
        if let snapshot = snapshot {
            for document in snapshot.documents {
                let documentData = document.data()
                print("Document data: \(documentData)")
            }
        }
    }
}