Question

我在firestore数据库中有一个像对象形式的结构。我需要从firestore检索数据并在swb中的tablebview中显示它

-

collection//users
        -authid
       - collection//Split
         - auth id
         - collection//SentInvitations
           -automatic id
             -Invitee(i)(object)
                .name:bnnn
                .phonenumber:567788
                .amount:123
            - Invitee(2)
                .name:aaaa
                .phonenumber:987654321
                .amount:198

其中i =被邀请者的号码现在我需要检索这些所有被邀请者并显示到表格视图

代码我试图从firestore检索数据

func loadData(){
    let authid = Auth.auth().currentUser?.uid
   let docRef =  db.collection("deyaPayUsers").document(authid!).collection("Split").document(authid!).collection("SentInvitations").document(senderautoid!)
        docRef.getDocument { (document, error) in
                        if let city = document.flatMap({
                            $0.data().flatMap({ (data) in
                                return Invite(dictionary: data)
                            })
                        }) {
                            print("City: \(city)")
                        } else {
                            print("Document does not exist")
                        }
                    }

    }

和我的模型类邀请

import Foundation
import FirebaseFirestore

protocol DocumentSerializable2
{
    init?(dictionary:[String:Any])
}
struct Invite {
    var PhoneNumber:Int
    var Amount:Int
    //var Status:String
    var dictionary:[String:Any]{
        return [
            "PhoneNumber":PhoneNumber,
            "Amount":Amount,
            ]
    }
}
    extension  Invite : DocumentSerializable2{
    init?(dictionary: [String:Any]){
        guard let amount = dictionary["Amount"] as? Int,
            let phonenumber = dictionary["PhoneNumber"] as? Int else { return nil}
        self.init(PhoneNumber:phonenumber, Amount:amount)

        }
    }

当我执行此代码时，它对else条件文件不存在但在firestore中它包含文档。要获得这些，还有其他方法可以解决

Answer 1

在与Vijju讨论问题后，我们错过了一点，即Firestore在其字典中没有使用Swift类型，但Objective-C类型。因此，预期为Int的内容应首先投放到NSNumber，然后从NSNumber获得Int值。所以总结一下代码：

init?(dictionary: [String:Any]){
        guard let nsNumberAmount = dictionary["Amount"] as? NSNumber,
            let nsNumberPhoneNumber = dictionary["PhoneNumber"] as? NSNumber else { return nil}
        let phoneNumber = nsNumberPhoneNumber.intValue
        let amount = nsNumberAmount.intValue

        self.init(PhoneNumber:phonenumber, Amount:amount)
    }

Firestore：如何从IOS（Swift）中的firestore获取对象数据并在tableview中显示它

1 个答案: