如何快速点击Firestore中的uitablecellviewcell来获取文档ID [英] how to get document id on tapping the uitablecellviewcell in Firestore in swift
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问题描述
点击UItableViewCell时应该如何获取文档ID?
How should I get the document id upon tapping the UItableViewCell?
我知道下面的代码确实为我提供了行索引，但是对于提要帖子，我希望每次都获取特定帖子的文档ID
I know the below code do give me the row index, but for a feed post I would like to get the document id for the the particular post everytime
我尝试通过模型文件中的密钥设置来检索文档ID，但无济于事
I have tried to retrieve the document id through key setup in model file but avail to no good
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("row selected: \(indexPath.row)")
performSegue(withIdentifier: "toDetailView", sender: indexPath)
}
帖子模型
import Foundation
import Firebase
import FirebaseFirestore
protocol DocumentSerializable {
init?(dictionary:[String:Any])
}
struct Post {
var _username: String!
var _postTitle: String!
var _postcategory: String!
var _postContent: String!
var dictionary:[String:Any] {
return [
"username": _username,
//"profile_pic":profile_pic,
"postTitle":_postTitle,
"postcategory":_postcategory,
"postContent":_postContent
]
}
}
extension Post : DocumentSerializable {
init?(dictionary: [String : Any]) {
guard let username = dictionary["username"] as? String,
// let profile_pic = dictionary["profile_pic"] as? String,
let postTitle = dictionary["postTitle"] as? String,
let postcategory = dictionary["postcategory"] as? String,
let postContent = dictionary["postContent"] as? String else { return nil }
self.init( _username: username ,_postTitle: postTitle, _postcategory: postcategory, _postContent: postContent)
}
}
将整个集合检索到的代码.表格视图
Code to retrieve the collection as whole into. tableview
import Foundation
import UIKit
import Firebase
class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var tableView:UITableView!
var posts = [Post]()
var db: Firestore!
var postKey:String = ""
private var documents: [DocumentSnapshot] = []
//public var posts: [Post] = []
private var listener : ListenerRegistration!
override func viewDidLoad() {
super.viewDidLoad()
db = Firestore.firestore()
self.navigationController?.navigationBar.isTranslucent = false
tableView = UITableView(frame: view.bounds, style: .plain)
let cellNib = UINib(nibName: "PostTableViewCell", bundle: nil)
tableView.register(cellNib, forCellReuseIdentifier: "postCell")
tableView.backgroundColor = UIColor(white: 0.90,alpha:1.0)
view.addSubview(tableView)
var layoutGuide:UILayoutGuide!
if #available(iOS 11.0, *) {
layoutGuide = view.safeAreaLayoutGuide
} else {
// Fallback on earlier versions
layoutGuide = view.layoutMarginsGuide
}
tableView.leadingAnchor.constraint(equalTo: layoutGuide.leadingAnchor).isActive = true
tableView.topAnchor.constraint(equalTo: layoutGuide.topAnchor).isActive = true
tableView.trailingAnchor.constraint(equalTo: layoutGuide.trailingAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: layoutGuide.bottomAnchor).isActive = true
tableView.delegate = self
tableView.dataSource = self
tableView.reloadData()
retrieveAllPosts()
//checkForUpdates()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/* override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
performSegueWithIdentifier("toDetailPage", sender: indexPath)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let indexPath = self.tableView.indexPathForSelectedRow
let person = personList[indexPath!.row]
if segue.identifier == "toDetailPage"{
let DetailBookViewController = (segue.destinationViewController as! DetailPage)
DetailBookViewController.user_name = user_name
DetailBookViewController.user_age = user_age
DetailBookViewController.user_urlPicture = user_urlPicture
}*/
@IBAction func handleLogout(_ sender:Any) {
try! Auth.auth().signOut()
self.dismiss(animated: false, completion: nil)
}
/*func checkForUpdates() {
db.collection("posts").whereField("timeStamp", isGreaterThan: Date())
.addSnapshotListener {
querySnapshot, error in
guard let snapshot = querySnapshot else {return}
snapshot.documentChanges.forEach {
diff in
if diff.type == .added {
self.posts.append(Post(dictionary: diff.document.data())!)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
}*/
func retrieveAllPosts(){
let postsRef = Firestore.firestore().collection("posts").limit(to: 50)
postsRef.getDocuments { (snapshot, error) in
if let error = error {
print(error.localizedDescription)
} else {
if let snapshot = snapshot {
for document in snapshot.documents {
let data = document.data()
self.postKey = document.documentID
let username = data["username"] as? String ?? ""
let postTitle = data["postTitle"] as? String ?? ""
let postcategory = data["postcategory"] as? String ?? ""
let postContent = data["postContent"] as? String ?? ""
let newSourse = Post(_postKey:self.postKey, _username: username, _postTitle: postTitle, _postcategory: postcategory, _postContent: postContent)
self.posts.append(newSourse)
print(self.postKey)
}
self.tableView.reloadData()
}
}
}
}
/* postsRef.getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
print("\(document.documentID) => \(document.data())")
self.posts = querySnapshot!.documents.flatMap({Post(dictionary: $0.data())})
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}*/
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! PostTableViewCell
cell.set(post: posts[indexPath.row])
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("row selected: \(indexPath.row)")
//performSegue(withIdentifier: "toDetailView", sender: indexPath)
}
}
推荐答案
向您的 Post 结构中添加一个新的documentId属性:
Add a new documentId property to your Post struct:
struct Post {
var _username: String!
var _postTitle: String!
var _postcategory: String!
var _postContent: String!
var _documentId: String! // This is new.
var dictionary:[String : Any] {
return [
"documentId" : _documentId, // This is new.
"username": _username,
//"profile_pic":profile_pic,
"postTitle":_postTitle,
"postcategory":_postcategory,
"postContent":_postContent
]
}
}
extension Post : DocumentSerializable
{
init?(dictionary: [String : Any])
{
guard let username = dictionary["username"] as? String,
// let profile_pic = dictionary["profile_pic"] as? String,
let postTitle = dictionary["postTitle"] as? String,
let postcategory = dictionary["postcategory"] as? String,
let documentId = dictionary["documentId"] as? String // This is new.
let postContent = dictionary["postContent"] as? String else { return nil }
self.init( _username: username ,_postTitle: postTitle, _postcategory: postcategory, _postContent: postContent, _documentId: documentId)
}
}
更改您的 retrieveAllPosts 函数并设置Post实例的documentId，请不要为此使用全局变量:
Change your retrieveAllPosts function and set the documentId of the Post instance, do not use the global variable for this:
if let snapshot = snapshot
{
for document in snapshot.documents
{
let data = document.data()
let username = data["username"] as? String ?? ""
let postTitle = data["postTitle"] as? String ?? ""
let postcategory = data["postcategory"] as? String ?? ""
let postContent = data["postContent"] as? String ?? ""
let newSourse = Post(_postKey:self.postKey, _username: username, _postTitle: postTitle, _postcategory: postcategory, _postContent: postContent, _documentId: document.documentId)
self.posts.append(newSourse)
}
}
现在，您可以在didSelectRowAt中访问所选 Post 的documentId:
Now you can access the documentId of the selected Post in didSelectRowAt:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
{
let post = self.posts[indexPath.row]
Swift.print(post.documentId)
// print("row selected: \(indexPath.row)")
// performSegue(withIdentifier: "toDetailView", sender: indexPath)
}
希望这会引导您走向正确的方向.
Hopefully this will guide you into the right direction.
这篇关于如何快速点击Firestore中的uitablecellviewcell来获取文档ID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IT屋！
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