irebase数据从tableview传递给ViewContro

irebase数据从tableview传递给ViewContro

本文介绍了将Firebase数据从tableview传递给ViewController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

我有问题显示在由segue连接的另一个视图控制器中选定单元格的构造和模型。单元格显示Vin数字,我想要将该特定vin编号的制作和模型信息传递给另一个ViewController。我试图设置传递的价值,但不能得到它的工作。有人可以看一下,看看他们能否发现我出错的地方?



以下是我的firebase数据库的样子:

 车辆: {
5UXKR0C34H0X82785:{
车辆信息:{
make:toyota,
型号:corolla,
VinNumber:5UXKR0C34H0X82785
}


$ / code $ / $ p

这是我的Vehicle模型类

  import Foundation 
导入FirebaseDatabase

结构VehicleModel {
var Make:String?
var Model:String?
var VinNumber:String?
$ b $ init(Make:String?,Model:String ?, VinNumber:String?){
self.Make = Make
self.Model = Model
self。 VinNumber = VinNumber
}

init(snapshot:DataSnapshot){
let snapshotValue = snapshot.value as! [String:AnyObject]
VinNumber = snapshotValue [VinNumber] as? String
Make = snapshotValue [Make] as?字符串
模型= snapshotValue [模型]为? String




$ p $这些是我的视图控制器代码



$ p $ 导入UIKit
导入Firebase
导入FirebaseDatabase
类InventoryTableViewController:UITableViewController {


var ref:DatabaseReference!
var refHandle:UInt!
var userList = [VehicleModel]()

let cellId =cellId

override func viewDidLoad(){
super.viewDidLoad()

ref = Database.database()。reference()

tableView.delegate = self
tableView.dataSource = self

tableView? .register(UITableViewCell.self,forCellReuseIdentifier:
cellId)
fetchUsers()
}

覆盖func tableView(_ tableView:UITableView,numberOfRowsInSection
部分:Int) - > Int {
return userList.count
}

覆盖func tableView(_ tableView:UITableView,cellForRowAt indexPath:
IndexPath) - > UITableViewCell {
//设置单元格内容
let cell = tableView.dequeueReusableCell(withIdentifier:cellId,for:
indexPath)作为UITableViewCell
let eachvehicle = userList [indexPath.row ]
cell.textLabel!.text =\(String(descriptions:eachvehicle.VinNumber))
return cell
}

func fetchUsers(){
refHandle = ref.child(Vehicles)。如果让字典= snapshot.childSnapshot(forPath:
),观察(.childAdded,在
中有{
(快照) (字典)
打印(字典)
让VinNumber = dictionary [VinNumber]
让Make = dictionary [Make]
模型=字典[模型]
self.userList.insert(VehicleModel(Make:Make as?String,Model:
Model as?String,VinNumber:VinNumber as?String) 0)
self.tableView.reloadData()
}
}}
}
}

覆盖func tableView(_ tableView:UITableView,didSelectRowAt indexPath:
IndexPath){
let storyboard = UIStoryboard :Main,bundle:Bundle.main)
let destination = storyboard.instantiateViewController(withIdentifier:
AdditionalInfoViewController)as! AdditionalInfoViewController
navigationController?.pushViewController(destination,animated:true)
performSegue(withIdentifier:toAdditionalInfo,sender:self)
let row = indexPath.row
print(working到目前为止)

let indexPath = tableView.indexPathForSelectedRow!
let currentCell = tableView.cellForRow(at:indexPath)!作为UITableViewCell
makeToPass = currentCell.Model
modelToPass = currentCell.Make
}
覆盖func prepare(for segue:UIStoryboardSegue,sender:Any?){
if segue .identifier ==toMapView{
var viewController = segue.destination as!
AdditionalInfoViewController
viewController.makeToPass = makeToPass
viewController.modelToPass = modelToPass
$ b}
}

我的AdditionalInfoView控制器中的变量结构
$ b $ pre $ var $ passValue:串?
var latitudePassedValue:String?
var longitudePassedValue:String?


解决方案

这个问题似乎是在解析数据从数据库。该结构包含 make 模型全部小写:

<$
make:toyota,
模型:corolla,
// ...
code>

但是在解析方法中,用大写的第一个字母来处理它:

  // ... 
Make = snapshotValue [Make] as? String //Make
Model = snapshotValue [Model] as? String //Model
// ...


I am having issues displaying the make and model of the selected cell in another view controller connected by a segue. The Cells display the Vin Number and I want the make and model info for that specific vin number passed to another ViewController. I have attempted to set up passing the values but can not get it to work. Can someone take a look and see if they can spot where I went wrong?

Here is what my firebase database looks like:

Vehicles: {
 5UXKR0C34H0X82785: {
    VehicleInfo: {
        make:"toyota",
        model:"corolla",
        VinNumber: "5UXKR0C34H0X82785"
      }
   }
}

Here is my Vehicle model class

import Foundation
import FirebaseDatabase

struct VehicleModel {
var Make: String?
var Model: String?
var VinNumber: String?

init(Make: String?, Model: String?, VinNumber: String?){
    self.Make = Make
    self.Model = Model
    self.VinNumber = VinNumber
}

    init(snapshot: DataSnapshot) {
    let snapshotValue = snapshot.value as! [String: AnyObject]
    VinNumber = snapshotValue["VinNumber"] as? String
    Make = snapshotValue["Make"] as? String
    Model = snapshotValue["Model"] as? String
  }
}

Here is my view controller code

import UIKit
import Firebase
import FirebaseDatabase
class InventoryTableViewController: UITableViewController{


    var ref: DatabaseReference!
    var refHandle: UInt!
    var userList = [VehicleModel]()

    let cellId = "cellId"

    override func viewDidLoad() {
    super.viewDidLoad()

    ref = Database.database().reference()

    tableView.delegate = self
    tableView.dataSource = self

    tableView?.register(UITableViewCell.self, forCellReuseIdentifier:
    "cellId")
    fetchUsers()
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection
section: Int) -> Int {
    return userList.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath:
IndexPath) -> UITableViewCell {
    // Set cell contents
    let cell = tableView.dequeueReusableCell(withIdentifier: "cellId", for:
indexPath) as UITableViewCell
    let eachvehicle = userList[indexPath.row]
    cell.textLabel!.text = "\(String(describing: eachvehicle.VinNumber))"
    return cell
}

func fetchUsers(){
            refHandle = ref.child("Vehicles").observe(.childAdded, with: {
(snapshot) in
             if let dictionary = snapshot.childSnapshot(forPath:
"VehicleInfo").value as? [String: AnyObject] {
            print(dictionary)
            let VinNumber = dictionary["VinNumber"]
            let Make = dictionary["Make"]
            let Model = dictionary["Model"]
            self.userList.insert(VehicleModel(Make: Make as? String, Model:
Model as? String, VinNumber:         VinNumber as? String), at: 0)
            self.tableView.reloadData()
        }
    })
  }
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath:
IndexPath) {
    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
    let destination = storyboard.instantiateViewController(withIdentifier:
"AdditionalInfoViewController") as! AdditionalInfoViewController
    navigationController?.pushViewController(destination, animated: true)
    performSegue(withIdentifier: "toAdditionalInfo", sender: self)
        let row = indexPath.row
        print("working so far ")

    let indexPath = tableView.indexPathForSelectedRow!
    let currentCell = tableView.cellForRow(at: indexPath)! as UITableViewCell
    makeToPass = currentCell.Model
    modelToPass = currentCell.Make
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "toMapView" {
        var viewController = segue.destination as!
AdditionalInfoViewController
        viewController.makeToPass = makeToPass
        viewController.modelToPass = modelToPass

    }
}

structure for variables in my AdditionalInfoView Controller

    var passedValue: String?
    var latitudePassedValue: String?
    var longitudePassedValue: String?
解决方案

The problem seems to be in the parsing of the data from the database. The structure has make and model all lower case:

// ...
make:"toyota",
model:"corolla",
// ...

But in the parsing method you're addressing it with the first letter in uppercase:

// ...
Make = snapshotValue["Make"] as? String // "Make"
Model = snapshotValue["Model"] as? String // "Model"
// ...

这篇关于将Firebase数据从tableview传递给ViewController的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-14 04:07