[英]Error while receiving image array from the Child's folder Firebase Swift
我目前正在尝试从我的孩子的文件夹中接收带有标题的图像数组,该图像通过detailViewController中的按钮连接到另一个offertableview,但是不幸的是,我一直收到错误消息。 在下面,我附上了Firebase数据结构的图像和我的主板截图。
对于第一个表格视图,我有一个餐厅列表,选择一个单元格后,它会转移到详细信息视图控制器,该控制器在该detailVC中列出餐厅的所有详细信息(为此我创建了餐厅的模型)连接到offerstable视图的按钮,其中列出了该特定餐厅的所有要约。
当我单击该按钮时,它会转移到offers表视图,由于错误导致应用程序关闭。
我的优惠表格视图代码:
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中: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
}
Xcode错误:
2017-08-16 10:26:33.652 Applic [1174] [Firebase / Analytics] [I-ACS003007]成功自动自动创建了Firebase Analytics App委托代理。 要禁用代理,请将Info.plist 2017-08-16 10:26:33.826 Applic [1174] [Firebase / Analytics] [I-ACS032003]中的标志FirebaseAppDelegateProxyEnabled设置为NO。iAd框架未链接。 搜索广告归因报告器已禁用。 2017-08-16 10:26:33.828应用[1174] [Firebase / Analytics] [I-ACS023012] Firebase Analytics启用致命错误:在展开可选值时意外发现nil
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
}
}
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
上课申报后
let appDelegate = UIApplication.shared.delegate as! AppDelegate
在prepareForSegue中
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,但不调用您的fetchBars现在只需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()
}
}
}
})
}
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