从Child的文件夹Firebase Swift接收图像阵列时出错

时间:2017-08-16 06:05:47

标签: ios swift uitableview firebase firebase-realtime-database

我目前正在尝试从我的Child的文件夹中收到一个带有标题的图像数组到另一个通过detailViewController按钮连接的offertableview,但不幸的是我一直收到错误。下面我附上了我的firebase数据结构和我的主板截图的图像。

对于第一个表格视图,我有一个餐馆列表,在选择一个单元格后,它会转移到详细视图控制器,其中列出了餐厅的所有细节(为此我创建了我餐厅的模型)在那个detailVC我有一个连接到offertableview的按钮,列出了该特定餐厅的所有优惠。

当我点击按钮时,它会转移到商品表视图,这会导致应用程序因错误而关闭。

我提供的tableview代码:

var ref: DatabaseReference!
var offerImageArray = [String]()
var titleArray = [String]()

override func viewDidLoad() {
    super.viewDidLoad()
    fetchBars()
}

func fetchBars(){

    ref.child("Paris").observeSingleEvent(of: .value, with: { (snapshot) in
        for child in snapshot.children {
            let snap = child as! DataSnapshot
            let imageSnap = snap.childSnapshot(forPath: "offers")
            let dict = imageSnap.value as! [String: Any]
            let imageUrl = dict["offer_image"] as? String
            let titleUrl = dict["offer_title"] as? String
            self.offerImageArray = [imageUrl! as String]
            self.titleArray = [titleUrl! as String]
        }
    })
        self.tableView.reloadData()
}

覆盖func numberOfSections(在tableView:UITableView中) - > Int {         返回1     }

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

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "OfferCell", for: indexPath) as! OffersTableViewCell

    cell.offerImageView.sd_setImage(with: URL(string: self.offerImageArray[indexPath.row]))
    cell.titleLabel.text = titleArray[indexPath.row]
           return cell
}

Xcode错误:

  

2017-08-16 10:26:33.652申请[1174]   [Firebase / Analytics] [I-ACS003007]已成功创建Firebase   Analytics App会自动委派代理。要禁用代理,请设置   Info.plist中的标志FirebaseAppDelegateProxyEnabled为NO   2017-08-16 10:26:33.826申请[1174]   [Firebase / Analytics] [I-ACS032003] iAd框架未链接。搜索   Ad Attribution Reporter已停用。 2017-08-16 10:26:33.828   申请[1174] [Firebase / Analytics] [I-ACS023012] Firebase   分析启用了致命错误:在展开时意外发现为零   一个可选值

NewFirbaseStructure

2 个答案:

答案 0 :(得分:0)

import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
import FirebaseStorage
import SDWebImage


class OffersTableVC: UITableViewController {
    var ref: DatabaseReference!
   var offerImageArray = [String]()
    var titleArray = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
        fetchBars()
    }

    func fetchBars(){

        Database.database().reference().child("paris").observeSingleEvent(of: .value, with: { (snapshot) in

            print("Main Snapshot is \(snapshot)")

            for child in snapshot.children {
                let snap = child as! DataSnapshot
                let imageSnap = snap.childSnapshot(forPath: "offers")



                if let snapDict = imageSnap.value as? [String:AnyObject] {
                    let dictKeys = [String](snapDict.keys)
                    print(dictKeys)
                    let dictValues = [AnyObject](snapDict.values)
                    print(dictValues)


                    for each in dictValues{
                        let imageUrl = each["offer_image"] as? String
                        print(imageUrl!)
                        self.offerImageArray.append(imageUrl!)

                    }
                    self.tableView.dataSource = self
                    self.tableView.delegate = self
                    self.tableView.reloadData()

                }





//                let dict = imageSnap.value as! [String: Any]
//                let imageUrl = dict["offer_image"] as? String
//                let titleUrl = dict["offer_title"] as? String
//                self.offerImageArray = [imageUrl! as String]
//                self.titleArray = [titleUrl! as String]
            }
        })

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return offerImageArray.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "OfferCell", for: indexPath) as! OffersTableViewCell

        cell.offerImageView.sd_setImage(with: URL(string: self.offerImageArray[indexPath.row]))
//        cell.titleLabel.text = titleArray[indexPath.row]
               return cell
    }

}

答案 1 :(得分:0)

1)在Appdelegate.swift中添加selectedBarname如下

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var selectedBarName = String()

2)MainTableVc添加以下代码

宣布上课后

let appDelegate = UIApplication.shared.delegate as! AppDelegate

在prepareForSegue

if segue.identifier == "DetailView", let bar = selectedBar{
            appDelegate.selectedBarName = bar.barName

3)OfferTableVc

现在只需调用此函数并完成,但现在不要将fetchBars调用为getOffers

func getOffers() {
    let databaseRef = Database.database().reference().child("aktau")
        databaseRef.queryOrdered(byChild: "bar_name").queryEqual(toValue: self.appDelegate.selectedBarName).observe(.value, with: { snapshot in

        if ( snapshot.value is NSNull ) {
            print("not found)")

        } else {
            print(snapshot.value!)
            for child in snapshot.children {
                let snap = child as! DataSnapshot
                let imageSnap = snap.childSnapshot(forPath: "offers")
                if let snapDict = imageSnap.value as? [String:AnyObject] {

                    let dictValues = [AnyObject](snapDict.values)


                    for each in dictValues{
                        let imageUrl = each["offer_image"] as? String
                        print(imageUrl!)
                        self.offerImageArray.append(imageUrl!)

                    }
                    self.tableView.dataSource = self
                    self.tableView.delegate = self
                    self.tableView.reloadData()

                }

            }


        }
    })
}