Firebase iOS Swift致命错误：NSArray元素无法与Swift数组元素类型匹配 [英] Firebase iOS Swift fatal error: NSArray element failed to match the Swift Array Element type

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本文介绍了Firebase iOS Swift致命错误：NSArray元素无法与Swift数组元素类型匹配的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

  {
chits ：{
Chit-1：{
Bidders：[
 {
bankAccNumber：5555566966，
bankIFSC：GFHJJHHJ ，
bankName：55666，
bidderEmail：desi@venkat.co.in，
bidderId：Bidder-1，
 bidderName：Venkat Desi，
bidderPhone：9999999999，
checked：false，
paymentType：66555 
}，
 {
bankAccNumber：5555566966，
bankIFSC：GFHJJHHJ，
bankName：55666，
bidderEmail：desi @ venkat。投标人2，
bidderName：Venkat Desi，
bidderPhone：9999999999，
 ：false，
paymentType：66555 
} 
]，
chit Id：Chit-1，
chitName：ABC1，
chitTotalValue：240000，
endDate：11/10/2018，
monthlyShare：1000，
startDate：11/10/2017，
totalMonths：12 
} 
} 
}

根据上面的JSON，我创建了模型


Bidder.swift 



  class Bidder {
 
 var bidderId：Int 
 var bidderName：String 
 var bidderEmail：String 
 var bidderPhone：String 
 var modeOfPayment：Int 
 var bidderBankName：String 
 var bidderBankAcno：String 
 var bidderIfscCode：String 
 var paymentArray：[[String：String]]？ 
 var chitrefArray：[String]？ 
 var ref：FIRDatabaseReference？ （BidderId：Int，bidderName：String，bidderEmail：String，bidderPhone：String，modeOfPayment：Int，bidderBankName：String，bidderBankAcno：String，bidderIfscCode：String，paymentArray：[[String：String] ]，chitrefArray：[String]）{
 self.bidderId = bidderId 
 self.bidderName = bidderName 
 self.bidderEmail = bidderEmail 
 self.bidderPhone = bidderPhone 
 self .modeOfPayment = modeOfPayment 
 self.bidderBankName = bidderBankName 
 self.bidderBankAcno = bidderBankAcno 
 self.bidderIfscCode = bidderIfscCode 
 self.paymentArray = paymentArray 
 self.chitrefArray = chitrefArray 
 self.ref = nil 
} 
 
 init（snapshot：FIRDataSnapshot）{
 let snapshotValue = snapshot.value as！ [String：AnyObject] 
 bidderId = snapshotValue [bidderId] as！ Int 
 bidderName = snapshotValue [bidderName] as！字符串
 bidderEmail = snapshotValue [bidderEmail]为！字符串
 bidderPhone = snapshotValue [bidderPhone] as！字符串
 modeOfPayment = snapshotValue [modeOfPayment] as！ Int 
 bidderBankName = snapshotValue [bidderBankName] as！字符串
 bidderBankAcno = snapshotValue [bidderBankAcno] as！字符串
 bidderIfscCode = snapshotValue [bidderIfscCode] as！字符串
 paymentArray = snapshotValue [paymentArray] as？ [[String：String]] 
 chitrefArray = snapshotValue [chitrefArray] as？ [String] 
 ref = snapshot.ref 
} 
 
 func toAnyObject（） - >任何{
 return [
bidderId：bidderId，
bidderName：bidderName，
bidderEmail：bidderEmail，
bidderPhone：bidderPhone，
modeOfPayment：modeOfPayment，
bidderBankName：bidderBankName，
bidderBankAcno：bidderBankAcno，
bidderIfscCode：bidderIfscCode，
paymentArray：paymentArray as Any， 
chitrefArray：chitrefArray as Any 
] 
} 
 
}




ChitObject.swift




<$ p $ chitObject {

var chitId：Int
var chitName：String
var startDate：String
var endDate：String
var chitTotalAmt：Int
var chitTotalMonths：Int
var bidders：[Bidder]
var ref：FIRDatabaseReference？
$ b $ init（chitId：Int，chitName：String，startDate：String，endDate：String，chitTotalAmt：Int，chitTotalMonths：Int，bidders：[Bidder]）{
self.chitId = chitId
self.chitName = chitName
self.startDate = startDate
self.endDate = endDate
self.chitTotalAmt = chitTotalAmt
self.chitTotalMonths = chitTotalMonths
self .bidders = bidders
self.ref = nil
}

init（snapshot：FIRDataSnapshot）{
let snapshotValue = snapshot.value as！ [String：AnyObject]
chitId = snapshotValue [chitId] as！ Int
chitName = snapshotValue [chitName] as！字符串
startDate = snapshotValue [startDate] as！字符串
endDate = snapshotValue [endDate] as！字符串
chitTotalAmt = snapshotValue [chitTotalAmt] as！ Int
chitTotalMonths = snapshotValue [chitTotalMonths] as！ Int
bidders = snapshotValue [bidders] as！ [Bidder]
ref = snapshot.ref
}

func toAnyObject（） - >词典< String，Any>
返回[
chitId：chitId，
chitName：chitName，
startDate：startDate，$ b $endDate：endDate ，
chitTotalAmt：chitTotalAmt，
chitTotalMonths：chitTotalMonths，
bidders：bidders.map（{$ 0.toAnyObject（）}）
]
}






$ b

然而，在Viewcontroller中我试图获取<
$ b 

  var chitsArray = [ChitObject]（）
 ChitUtils。观察（.value，其中：$快照$ b $如果snapshot.childrenCount> 0 
 {
 self.chitsArray.removeAll（）
为snapshot.children中的项目
 {
 let chitItem = ChitObject（snapshot：item as！FIRDataSnapshot）
 self.chitsArray.append（chi （self.chitsArray.first！.bidders）
 ChitUtils.lastChitId =（self.chitsArray。（））
 
 self.chitsArray = self.chitsArray.reversed（）
 print第一？.chitId）！ + 1 
 self.chitsTableView.reloadData（）
} 
}）




仅当尝试访问 bidders array < print（self.chitsArray.first！ .bidders）。但是，阵列计数似乎一直是正确的。



解决方案

问题出在您的 ChitObject 

  bidders = snapshotValue [bidders] as！ [Bidder]

您需要创建一个Bidders数组并将其分配给Bidders变量。循环访问您从snapshotValue [bidders]获得的数组，并为每个值创建Bidders对象，并将其分配到Swift数组中。

我还没有使用Firebase，这样的东西可能会工作：

$ $ p $ code init init（snapshot：FIRDataSnapshot）{
let snapshotValue = snapshot.value as！ [String：AnyObject]
chitId = snapshotValue [chitId] as！ Int
chitName = snapshotValue [chitName] as！字符串
startDate = snapshotValue [startDate] as！字符串
endDate = snapshotValue [endDate] as！字符串
chitTotalAmt = snapshotValue [chitTotalAmt] as！ Int
chitTotalMonths = snapshotValue [chitTotalMonths] as！如果让biddersArray = snapshotValue [bidders]为int
？ [[String：Any]] {
bidders = biddersArray.flatMap {Bidder（dict：$ 0）}
}
ref = snapshot.ref
}
code $ <$ $ p

编辑：

 类Bidder {
 
 var bidderId：Int 
 var bidderName：String 
 var bidderEmail：String 
 var bidderPhone：String 
 var modeOfPayment：Int 
 var bidderBankName：String 
 var bidderBankAcno：String 
 var bidderIfscCode：String 
 var paymentArray：[[String：String]]？ 
 var chitrefArray：[String]？ 
 var ref：FIRDatabaseReference？ 
 
便捷初始化（字符串：[String：Any]）{
 guard让bidderId = dict [bidderId]为？诠释，让bidderName = dict [bidderName]为？字符串，让bidderEmail = dict [bidderEmail]为？字符串，让bidderPhone = dict [bidderPhone]为？字符串，请让modeOfPayment = dict [paymentType]为？诠释，让bidderBankName = dict [bankName]为？字符串，让bidderBankAcno = dict [bankAccNumber]为？字符串，让bidderIfscCode = dict [bankIFSC]为？ （bidderId：bidderId，bidderName：bidderName，bidderEmail：bidderEmail，bidderPhone：bidderPhone，modeOfPayment：modeOfPayment，bidderBankName：bidderBankName，bidderBankAcno：bidderBankAcno， bidderIfscCode：bidderIfscCode，paymentArray：[[]]，chitrefArray：[]）
} 
 
（bidderId：Int，bidderName：String，bidderEmail：String，bidderPhone：String，modeOfPayment：Int ，bidderBankName：String，bidderBankAcno：String，bidderIfscCode：String，paymentArray：[[String：String]]，chitrefArray：[String]）{
 self.bidderId = bidderId 
 self.bidderName = bidderName 
 self.bidderEmail = bidderEmail 
 self.bidderPhone = bidderPhone 
 self.modeOfPayment = modeOfPayment 
 self.bidderBankName = bidderBankName 
 self.bidderBankAcno = bidderBankAcno 
 self.bidderIfscCode = bidderIfscCode 
 self.paymentArray =支付mentArray 
 self.chitrefArray = chitrefArray 
 self.ref = nil 
} 
 
 init（snapshot：FIRDataSnapshot）{
 let snapshotValue = snapshot.value as ！ [String：AnyObject] 
 bidderId = snapshotValue [bidderId] as！ Int 
 bidderName = snapshotValue [bidderName] as！字符串
 bidderEmail = snapshotValue [bidderEmail]为！字符串
 bidderPhone = snapshotValue [bidderPhone] as！字符串
 modeOfPayment = snapshotValue [modeOfPayment] as！ Int 
 bidderBankName = snapshotValue [bidderBankName] as！字符串
 bidderBankAcno = snapshotValue [bidderBankAcno] as！字符串
 bidderIfscCode = snapshotValue [bidderIfscCode] as！字符串
 paymentArray = snapshotValue [paymentArray] as？ [[String：String]] 
 chitrefArray = snapshotValue [chitrefArray] as？ [String] 
 ref = snapshot.ref 
} 
 
 func toAnyObject（） - >任何{
 return [
bidderId：bidderId，
bidderName：bidderName，
bidderEmail：bidderEmail，
bidderPhone：bidderPhone，
modeOfPayment：modeOfPayment，
bidderBankName：bidderBankName，
bidderBankAcno：bidderBankAcno，
bidderIfscCode：bidderIfscCode，
paymentArray：paymentArray as Any， 
chitrefArray：chitrefArray as Any 
] 
} 
 
}


I am trying to fetch data from firebase database the format of data is below.

{
  "chits": {
    "Chit-1": {
      "Bidders": [
        {
          "bankAccNumber": "5555566966",
          "bankIFSC": "GFHJJHHJ",
          "bankName": "55666",
          "bidderEmail": "desi@venkat.co.in",
          "bidderId": "Bidder-1",
          "bidderName": "Venkat Desi",
          "bidderPhone": "9999999999",
          "checked": false,
          "paymentType": 66555
        },
        {
          "bankAccNumber": "5555566966",
          "bankIFSC": "GFHJJHHJ",
          "bankName": "55666",
          "bidderEmail": "desi@venkat.co.in",
          "bidderId": "Bidder-2",
          "bidderName": "Venkat Desi",
          "bidderPhone": "9999999999",
          "checked": false,
          "paymentType": 66555
        }
      ],
      "chitId": "Chit-1",
      "chitName": "ABC1",
      "chitTotalValue": 240000,
      "endDate": "11/10/2018",
      "monthlyShare": 1000,
      "startDate": "11/10/2017",
      "totalMonths": 12
    }
  }
}

According to the above JSON, I have created models

Bidder.swift

    class Bidder {

    var bidderId: Int
    var bidderName: String
    var bidderEmail: String
    var bidderPhone : String
    var modeOfPayment: Int
    var bidderBankName: String
    var bidderBankAcno: String
    var bidderIfscCode: String
    var paymentArray : [[String:String]]?
    var chitrefArray : [String]?
    var ref: FIRDatabaseReference?

    init(bidderId: Int, bidderName: String,bidderEmail: String, bidderPhone: String, modeOfPayment: Int, bidderBankName: String, bidderBankAcno: String, bidderIfscCode: String,paymentArray:  [[String:String]], chitrefArray: [String]) {
        self.bidderId = bidderId
        self.bidderName = bidderName
        self.bidderEmail = bidderEmail
        self.bidderPhone = bidderPhone
        self.modeOfPayment = modeOfPayment
        self.bidderBankName = bidderBankName
        self.bidderBankAcno = bidderBankAcno
        self.bidderIfscCode = bidderIfscCode
        self.paymentArray = paymentArray
        self.chitrefArray = chitrefArray
        self.ref = nil
    }

    init(snapshot: FIRDataSnapshot) {
        let snapshotValue = snapshot.value as! [String: AnyObject]
        bidderId = snapshotValue["bidderId"] as! Int
        bidderName = snapshotValue["bidderName"] as! String
        bidderEmail = snapshotValue["bidderEmail"] as! String
        bidderPhone = snapshotValue["bidderPhone"] as! String
        modeOfPayment = snapshotValue["modeOfPayment"] as! Int
        bidderBankName = snapshotValue["bidderBankName"] as! String
        bidderBankAcno = snapshotValue["bidderBankAcno"] as! String
        bidderIfscCode = snapshotValue["bidderIfscCode"] as! String
        paymentArray = snapshotValue["paymentArray"] as? [[String : String]]
        chitrefArray = snapshotValue["chitrefArray"] as? [String]
        ref = snapshot.ref
    }

    func toAnyObject() -> Any {
        return [
            "bidderId" : bidderId,
            "bidderName" : bidderName,
            "bidderEmail": bidderEmail,
            "bidderPhone": bidderPhone,
            "modeOfPayment": modeOfPayment,
            "bidderBankName":bidderBankName,
            "bidderBankAcno": bidderBankAcno,
            "bidderIfscCode":bidderIfscCode,
            "paymentArray": paymentArray as Any,
            "chitrefArray" : chitrefArray as Any
        ]
    }

}

ChitObject.swift

class ChitObject {

    var chitId : Int
    var chitName: String
    var startDate: String
    var endDate : String
    var chitTotalAmt: Int
    var chitTotalMonths: Int
    var bidders: [Bidder]
    var ref: FIRDatabaseReference?

    init(chitId: Int,chitName: String, startDate: String, endDate: String, chitTotalAmt: Int, chitTotalMonths: Int, bidders: [Bidder]) {
        self.chitId = chitId
        self.chitName = chitName
        self.startDate = startDate
        self.endDate = endDate
        self.chitTotalAmt = chitTotalAmt
        self.chitTotalMonths = chitTotalMonths
        self.bidders = bidders 
        self.ref = nil
    }

    init(snapshot: FIRDataSnapshot) {
        let snapshotValue = snapshot.value as! [String: AnyObject]
        chitId = snapshotValue["chitId"] as! Int
        chitName = snapshotValue["chitName"] as! String
        startDate = snapshotValue["startDate"] as! String
        endDate = snapshotValue["endDate"] as! String
        chitTotalAmt = snapshotValue["chitTotalAmt"] as! Int
        chitTotalMonths = snapshotValue["chitTotalMonths"] as! Int
        bidders = snapshotValue["bidders"] as! [Bidder]
        ref = snapshot.ref
    }

    func toAnyObject() -> Dictionary<String, Any>
    {
        return [
            "chitId" : chitId,
            "chitName": chitName,
            "startDate": startDate,
            "endDate": endDate,
            "chitTotalAmt":chitTotalAmt,
            "chitTotalMonths": chitTotalMonths,
            "bidders":bidders.map({$0.toAnyObject()})
        ]
    }

}

However, In Viewcontroller I am trying to fetch the biddersList from the code below.

var chitsArray = [ChitObject]()
 ChitUtils.chitRef.queryOrdered(byChild: "chitId").observe(.value, with: { snapshot in
            if snapshot.childrenCount > 0
            {
                self.chitsArray.removeAll()
                for item in snapshot.children
                {
                    let chitItem = ChitObject(snapshot: item as! FIRDataSnapshot)
                    self.chitsArray.append(chitItem)
                }
                    self.chitsArray = self.chitsArray.reversed()
                    print(self.chitsArray.first!.bidders)
                    ChitUtils.lastChitId = (self.chitsArray.first?.chitId)! + 1
                    self.chitsTableView.reloadData()
            }
        })

The fatal error only occurs while trying to access bidders array at print(self.chitsArray.first!.bidders). But, the array count seems to be correct all the time.

解决方案

The issue is in your ChitObject class, specifially here:

bidders = snapshotValue["bidders"] as! [Bidder]

You would need to create an array of Bidders and assign that into bidders variable. Loop through the array you get from snapshotValue["bidders"] and create Bidders object for every value and assign that into a Swift array.

I have not workded with Firebase but something like this may work:

init(snapshot: FIRDataSnapshot) {
    let snapshotValue = snapshot.value as! [String: AnyObject]
    chitId = snapshotValue["chitId"] as! Int
    chitName = snapshotValue["chitName"] as! String
    startDate = snapshotValue["startDate"] as! String
    endDate = snapshotValue["endDate"] as! String
    chitTotalAmt = snapshotValue["chitTotalAmt"] as! Int
    chitTotalMonths = snapshotValue["chitTotalMonths"] as! Int
    if let biddersArray = snapshotValue["bidders"] as? [[String:Any]] {
        bidders = biddersArray.flatMap{Bidder(dict:$0)}
    }
    ref = snapshot.ref
}

EDITED:

class Bidder {

    var bidderId: Int
    var bidderName: String
    var bidderEmail: String
    var bidderPhone : String
    var modeOfPayment: Int
    var bidderBankName: String
    var bidderBankAcno: String
    var bidderIfscCode: String
    var paymentArray : [[String:String]]?
    var chitrefArray : [String]?
    var ref: FIRDatabaseReference?

    convenience init?(dict:[String:Any]) {
        guard let bidderId = dict["bidderId"] as? Int, let bidderName = dict["bidderName"] as? String, let bidderEmail = dict["bidderEmail"] as? String, let bidderPhone = dict["bidderPhone"] as? String, let modeOfPayment = dict["paymentType"] as? Int, let bidderBankName = dict["bankName"] as? String, let bidderBankAcno = dict["bankAccNumber"] as? String, let bidderIfscCode = dict["bankIFSC"] as? String else {
            return nil
        }
        self.init(bidderId: bidderId, bidderName: bidderName, bidderEmail: bidderEmail, bidderPhone: bidderPhone, modeOfPayment: modeOfPayment, bidderBankName: bidderBankName, bidderBankAcno: bidderBankAcno, bidderIfscCode: bidderIfscCode, paymentArray: [[]], chitrefArray: [])
    }

    init(bidderId: Int, bidderName: String,bidderEmail: String, bidderPhone: String, modeOfPayment: Int, bidderBankName: String, bidderBankAcno: String, bidderIfscCode: String,paymentArray:  [[String:String]], chitrefArray: [String]) {
        self.bidderId = bidderId
        self.bidderName = bidderName
        self.bidderEmail = bidderEmail
        self.bidderPhone = bidderPhone
        self.modeOfPayment = modeOfPayment
        self.bidderBankName = bidderBankName
        self.bidderBankAcno = bidderBankAcno
        self.bidderIfscCode = bidderIfscCode
        self.paymentArray = paymentArray
        self.chitrefArray = chitrefArray
        self.ref = nil
    }

    init(snapshot: FIRDataSnapshot) {
        let snapshotValue = snapshot.value as! [String: AnyObject]
        bidderId = snapshotValue["bidderId"] as! Int
        bidderName = snapshotValue["bidderName"] as! String
        bidderEmail = snapshotValue["bidderEmail"] as! String
        bidderPhone = snapshotValue["bidderPhone"] as! String
        modeOfPayment = snapshotValue["modeOfPayment"] as! Int
        bidderBankName = snapshotValue["bidderBankName"] as! String
        bidderBankAcno = snapshotValue["bidderBankAcno"] as! String
        bidderIfscCode = snapshotValue["bidderIfscCode"] as! String
        paymentArray = snapshotValue["paymentArray"] as? [[String : String]]
        chitrefArray = snapshotValue["chitrefArray"] as? [String]
        ref = snapshot.ref
    }

    func toAnyObject() -> Any {
        return [
            "bidderId" : bidderId,
            "bidderName" : bidderName,
            "bidderEmail": bidderEmail,
            "bidderPhone": bidderPhone,
            "modeOfPayment": modeOfPayment,
            "bidderBankName":bidderBankName,
            "bidderBankAcno": bidderBankAcno,
            "bidderIfscCode":bidderIfscCode,
            "paymentArray": paymentArray as Any,
            "chitrefArray" : chitrefArray as Any
        ]
    }

}

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