[英]Swift Firebase “Cannot assign value of type 'Information' to type 'NSDictionary?'”
I have a tableview that is being populated with who a user is following. 我有一个正在填充用户关注谁的表视图。 Problem is that I need to pass that cells data to "var otherUser: NSDictionary!"
问题是我需要将该单元格数据传递给“ var otherUser:NSDictionary!”。 but because I am populating the cell using a data structure file called "Information" I get this error - "Cannot assign value of type 'Information' to type 'NSDictionary?'" in the prepareForSegue.
但是由于我使用名为“信息”的数据结构文件填充单元格,因此出现了此错误-“在prepareForSegue中无法将类型为“信息”的值分配为类型为“ NSDictionary?””。 I am unsure if I can repackage the information I need into a NSDictionary so I can successfully do a data pass.
我不确定是否可以将所需的信息重新打包到NSDictionary中,以便我可以成功进行数据传递。 I just don't know if this is a easy solution or an actual problem because of my ignorance.
由于我的无知,我只是不知道这是一个简单的解决方案还是一个实际的问题。
Following TableViewController Code 以下TableViewController代码
import UIKit
import Firebase
class BusinessFollowing: UITableViewController {
@IBOutlet var noDataView: UIView!
@IBOutlet var followingTableView: UITableView!
var yourFollowing = [Information]()
var listFollowing = [NSDictionary?]()
var databaseRef = Database.database().reference()
let uid = Auth.auth().currentUser?.uid
var loggedInUser = Auth.auth().currentUser
var loggedInUserData:NSDictionary?
var following = [String]()
override func viewDidLoad() {
super.viewDidLoad()
self.followingTableView.backgroundView = nil
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.followingTableView.reloadData()
self.yourFollowing.removeAll()
self.following.removeAll()
getFollowingData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
if segue.identifier == "following" {
// gotta check if we're currently searching
if let indexPath = followingTableView.indexPathForSelectedRow {
let user = self.yourFollowing[indexPath.row]
let controller = segue.destination as? ExploreBusinessProfileSwitchView
controller?.otherUser = user
}
}
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return self.yourFollowing.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! BusinessFollowingCell
let following = yourFollowing[indexPath.row]
let businessName = following.businessName
let businessStreet = following.businessStreet
let businessCity = following.businessCity
let businessState = following.businessState
cell.businessName.text = businessName
cell.businessStreet.text = businessStreet
cell.businessCity.text = businessCity
cell.businessState.text = businessState
// cell.businessName?.text = self.listFollowing[indexPath.row]?["businessName"] as? String
// cell.businessStreet?.text = self.listFollowing[indexPath.row]?["businessStreet"] as? String
// cell.businessCity?.text = self.listFollowing[indexPath.row]?["businessCity"] as? String
// cell.businessState?.text = self.listFollowing[indexPath.row]?["businessState"] as? String
return cell
}
func getFollowingData() {
self.yourFollowing.removeAll()
self.following.removeAll()
self.followingTableView.reloadData()
Database.database().reference().child("Businesses").child((loggedInUser?.uid)!).child("following").observe(.value, with: { snapshot in
if snapshot.exists() {
MBProgressHUD.showAdded(to: self.view, animated: true)
let databaseRef = Database.database().reference()
databaseRef.child("Businesses").queryOrderedByKey().observeSingleEvent(of: .value, with: { (usersSnapshot) in
let users = usersSnapshot.value as! [String: AnyObject]
for (_, value) in users {
if let userID = value["uid"] as? String {
if userID == Auth.auth().currentUser?.uid {
print(value)
if let followingUsers = value["following"] as? [String : String] {
for (_,user) in followingUsers {
self.following.append(user)
}
}
databaseRef.child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { (postsSnapshot) in
let posts = postsSnapshot.value as! [String: AnyObject]
for (_, post) in posts {
for (_, postInfo) in post as! [String: AnyObject] {
if let followingID = postInfo["uid"] as? String {
for each in self.following {
if each == followingID {
guard let uid = postInfo["uid"] as! String? else {return}
guard let name = postInfo["businessName"] as! String? else {return}
guard let address = postInfo["businessStreet"] as! String? else {return}
guard let state = postInfo["businessState"] as! String? else {return}
guard let city = postInfo["businessCity"] as! String? else {return}
self.yourFollowing.append(Information(uid: uid, businessName: name, businessStreet: address, businessCity: city, businessState: state))
}
self.followingTableView.backgroundView = nil
self.followingTableView.reloadData()
}
}
}
}
MBProgressHUD.hide(for: self.view, animated: true)
}) { (error) in
print(error.localizedDescription)
}
}
}
}
})
} else {
print("Not following anyone")
self.followingTableView.backgroundView = self.noDataView
MBProgressHUD.hide(for: self.view, animated: true)
}
})
}
}
"Information" Data Structure File “信息”数据结构文件
import UIKit
class Information {
var uid: String
var businessName: String
var businessStreet: String
var businessCity: String
var businessState: String
init(uid: String, businessName: String, businessStreet: String, businessCity: String, businessState: String){
self.uid = uid
self.businessName = businessName
self.businessStreet = businessStreet
self.businessCity = businessCity
self.businessState = businessState
}
}
The error is pretty clear. 错误非常明显。
user
in ExploreBusinessProfileSwitchView
is obviously declared as NSDictionary
, declare it as Information
. ExploreBusinessProfileSwitchView
user
显然声明为NSDictionary
,声明为Information
。
By the way don't use NSArray / NSDictionary
in Swift. 顺便说一句,不要在Swift中使用
NSArray / NSDictionary
。 Use native types. 使用本机类型。
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