Ios Firebase数据库中的Firebase ServerValue.timestamp（）不断更改
我正在尝试将ServerValue.timestamp（）的实例添加到我的firebase数据库中，当我运行应用程序时，时间戳不断增加。下面是代码，我不知道如何阻止firebase中的时间戳增加 这是我的自定义类和tableview类Ios Firebase数据库中的Firebase ServerValue.timestamp（）不断更改,ios,swift,xcode,firebase-realtime-database,Ios,Swift,Xcode,Firebase Realtime Database,我正在尝试将ServerValue.timestamp（）的实例添加到我的firebase数据库中，当我运行应用程序时，时间戳不断增加。下面是代码，我不知道如何阻止firebase中的时间戳增加 这是我的自定义类和tableview类 class Story { var text: String = "" var timestamp: String = "" let ref: DatabaseReference! init(text: String) {
class Story
{
var text: String = ""
var timestamp: String = ""
let ref: DatabaseReference!
init(text: String) {
self.text = text
ref = Database.database().reference().child("People").child("HomeFeed").child("Posts").childByAutoId()
}
init(snapshot: DataSnapshot)
{
ref = snapshot.ref
if let value = snapshot.value as? [String : Any] {
text = value["Post"] as! String
ref.updateChildValues(["timestamp":ServerValue.timestamp()])
let id = ref.key
Database.database().reference().child("People").child("HomeFeed").child("Posts").child("\(id)").child("timestamp").observeSingleEvent(of: .value) { (snapshot) in
let dope = snapshot.value as! Double
let x = dope / 1000
let date = NSDate(timeIntervalSince1970: x)
let formatter = DateFormatter()
formatter.dateStyle = .long
formatter.timeStyle = .medium
DispatchQueue.main.async {
self.timestamp = formatter.string(from: date as Date)
self.timestamp = "\(value["timestamp"])"
}
}
}
}
func save() {
ref.setValue(toDictionary())
}
func toDictionary() -> [String : Any]
{
return [
"Post" : text,
"timestamp" : timestamp
]
}
}
class TableViewController: UIViewController,UITableViewDataSource, UITableViewDelegate {
let databaseRef = Database.database().reference()
@IBOutlet weak var tableView: UITableView!
var rub: StorageReference!
@IBAction func createpost(_ sender: Any) {
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("ProfilePic").observe(DataEventType.value) { (snapshot) in
let profpic = snapshot.value as? String
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("Full Name").observe(DataEventType.value) { (snapshot) in }
let fullname = snapshot.value as? String
if profpic == nil && fullname == nil {
let alert = UIAlertController(title: "Need to create profile", message: nil, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "To create profile", style: UIAlertActionStyle.default, handler: { action in self.performSegue(withIdentifier: "ToCreateprof", sender: nil)}))
alert.addAction(UIAlertAction(title: "Dissmiss", style: UIAlertActionStyle.default, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}else {
self.performSegue(withIdentifier: "ToPost", sender: nil)
}
} //if no prof pic and name, no posting
}
@IBAction func toCreateorprofile(_ sender: Any) {
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("ProfilePic").observe(DataEventType.value) { (snapshot) in
let profpic = snapshot.value as? String
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("Full Name").observe(DataEventType.value) { (snapshot) in }
let fullname = snapshot.value as? String
if profpic != nil && fullname != nil {
self.performSegue(withIdentifier: "olduser", sender: nil)
}else {
self.performSegue(withIdentifier: "ToCreateprof", sender: nil)
}
}
}
let storiesRef = Database.database().reference().child("People").child("HomeFeed").child("Posts")
var stories = [Story]()
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// download stories
storiesRef.observe(.value, with: { (snapshot) in
self.stories.removeAll()
for child in snapshot.children {
let childSnapshot = child as! DataSnapshot
let story = Story(snapshot: childSnapshot)
self.stories.insert(story, at: 0)
}
self.tableView.reloadData()
})
}
@objc func handleRefresh(_ refreshControl: UIRefreshControl) {
self.tableView.reloadData()
refreshControl.endRefreshing()
}
lazy var refreshControl: UIRefreshControl = {
let refreshControl = UIRefreshControl()
refreshControl.addTarget(self, action:
#selector(TableViewController.handleRefresh(_:)),
for: UIControlEvents.valueChanged)
refreshControl.tintColor = UIColor.purple
return refreshControl
}()
override func viewDidLoad()
{
super.viewDidLoad()
self.tableView.reloadData()
self.tableView.addSubview(self.refreshControl)
tableView.delegate = self
tableView.dataSource = self
self.tableView.estimatedRowHeight = 92.0
self.tableView.rowHeight = UITableViewAutomaticDimension
}
override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
// MARK: - Table view data source
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return stories.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "Story Cell", for: indexPath) as! StoryTableviewcell
let story = stories[indexPath.row]
cell.story = story
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("Full Name").observe(.value) { (snapshot) in
let name = snapshot.value as? String
if name != nil {
cell.fullnamepost.text = name
}
}
rub = Storage.storage().reference().storage.reference(forURL:"gs://people-3b93c.appspot.com").child("ProfilePic").child(Auth.auth().currentUser!.uid)
if rub != nil {
// Create a UIImage, add it to the array
rub.downloadURL(completion: { (url, error) in
if error != nil {
print(error?.localizedDescription as Any)
return
}
URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
if error != nil {
print(error as Any)
return
}
guard let imageData = UIImage(data: data!) else { return }
DispatchQueue.main.async {
cell.profimage.image = imageData
}
}).resume()
})
}
return cell
}
}
class Story
{
var text: String = ""
var timestamp: String = ""
let ref: DatabaseReference!
init(text: String) {
self.text = text
ref = Database.database().reference().child("People").child("HomeFeed").child("Posts").childByAutoId()
}
init(snapshot: DataSnapshot)
{
ref = snapshot.ref
if let value = snapshot.value as? [String : Any] {
text = value["Post"] as! String
ref.updateChildValues(["timestamp":ServerValue.timestamp()])
let id = ref.key
Database.database().reference().child("People").child("HomeFeed").child("Posts").child("\(id)").child("timestamp").observeSingleEvent(of: .value) { (snapshot) in
let dope = snapshot.value as! Double
let x = dope / 1000
let date = NSDate(timeIntervalSince1970: x)
let formatter = DateFormatter()
formatter.dateStyle = .long
formatter.timeStyle = .medium
DispatchQueue.main.async {
self.timestamp = formatter.string(from: date as Date)
self.timestamp = "\(value["timestamp"])"
}
}
}
}
func save() {
ref.setValue(toDictionary())
}
func toDictionary() -> [String : Any]
{
return [
"Post" : text,
"timestamp" : timestamp
]
}
}
class TableViewController: UIViewController,UITableViewDataSource, UITableViewDelegate {
let databaseRef = Database.database().reference()
@IBOutlet weak var tableView: UITableView!
var rub: StorageReference!
@IBAction func createpost(_ sender: Any) {
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("ProfilePic").observe(DataEventType.value) { (snapshot) in
let profpic = snapshot.value as? String
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("Full Name").observe(DataEventType.value) { (snapshot) in }
let fullname = snapshot.value as? String
if profpic == nil && fullname == nil {
let alert = UIAlertController(title: "Need to create profile", message: nil, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "To create profile", style: UIAlertActionStyle.default, handler: { action in self.performSegue(withIdentifier: "ToCreateprof", sender: nil)}))
alert.addAction(UIAlertAction(title: "Dissmiss", style: UIAlertActionStyle.default, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}else {
self.performSegue(withIdentifier: "ToPost", sender: nil)
}
} //if no prof pic and name, no posting
}
@IBAction func toCreateorprofile(_ sender: Any) {
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("ProfilePic").observe(DataEventType.value) { (snapshot) in
let profpic = snapshot.value as? String
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("Full Name").observe(DataEventType.value) { (snapshot) in }
let fullname = snapshot.value as? String
if profpic != nil && fullname != nil {
self.performSegue(withIdentifier: "olduser", sender: nil)
}else {
self.performSegue(withIdentifier: "ToCreateprof", sender: nil)
}
}
}
let storiesRef = Database.database().reference().child("People").child("HomeFeed").child("Posts")
var stories = [Story]()
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// download stories
storiesRef.observe(.value, with: { (snapshot) in
self.stories.removeAll()
for child in snapshot.children {
let childSnapshot = child as! DataSnapshot
let story = Story(snapshot: childSnapshot)
self.stories.insert(story, at: 0)
}
self.tableView.reloadData()
})
}
@objc func handleRefresh(_ refreshControl: UIRefreshControl) {
self.tableView.reloadData()
refreshControl.endRefreshing()
}
lazy var refreshControl: UIRefreshControl = {
let refreshControl = UIRefreshControl()
refreshControl.addTarget(self, action:
#selector(TableViewController.handleRefresh(_:)),
for: UIControlEvents.valueChanged)
refreshControl.tintColor = UIColor.purple
return refreshControl
}()
override func viewDidLoad()
{
super.viewDidLoad()
self.tableView.reloadData()
self.tableView.addSubview(self.refreshControl)
tableView.delegate = self
tableView.dataSource = self
self.tableView.estimatedRowHeight = 92.0
self.tableView.rowHeight = UITableViewAutomaticDimension
}
override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
// MARK: - Table view data source
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return stories.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "Story Cell", for: indexPath) as! StoryTableviewcell
let story = stories[indexPath.row]
cell.story = story
self.databaseRef.child("ProfileInfo").child(Auth.auth().currentUser!.uid).child("Full Name").observe(.value) { (snapshot) in
let name = snapshot.value as? String
if name != nil {
cell.fullnamepost.text = name
}
}
rub = Storage.storage().reference().storage.reference(forURL:"gs://people-3b93c.appspot.com").child("ProfilePic").child(Auth.auth().currentUser!.uid)
if rub != nil {
// Create a UIImage, add it to the array
rub.downloadURL(completion: { (url, error) in
if error != nil {
print(error?.localizedDescription as Any)
return
}
URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
if error != nil {
print(error as Any)
return
}
guard let imageData = UIImage(data: data!) else { return }
DispatchQueue.main.async {
cell.profimage.image = imageData
}
}).resume()
})
}
return cell
}
}
您是否正在尝试记录故事创建的时间戳@Sirius请你把问题中的代码整理一下好吗？就像删除所有额外的条目一样。当一个故事被创建时，我想将时间戳保存到firebase，故事是否一直在被创建？在firebase中，时间戳一直在上升