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How to read data from firebase, block with doesn't work?

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2

I try to read data from firebase. I've made observeSingleEvent, but block "with" not works, why?

I try to debug and I notice that block with doesn't work.
userID has correct ID
and reference also correct

 var ref: DatabaseReference!
 var snapData: NSDictionary?
 var nameString = [String]()

 override func viewDidLoad() 
 super.viewDidLoad()

 ref = Database.database().reference()
 loadData()
 table.delegate = self
 table.dataSource = self
 table.register(UITableViewCell.self, forCellReuseIdentifier: "indentifire")
 view.addSubview(table)


 // Do any additional setup after loading the view.
 

 // ---------------------------------------------------

 //loading data from FireBase
 func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 self.snapData = snapshot.value as? NSDictionary
 )
 

 // delegate
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 var temp = 0
 for (_,val) in snapData! 
 if val as? String == "false" 
 temp += 1
 nameString.append(val as! String)
 
 
 return temp
 

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
 let cell = table.dequeueReusableCell(withIdentifier: "indentifire", for: indexPath)
 cell.textLabel!.text = nameString[indexPath.row]
 return cell
 ```

this is my database
![photo](https://imgur.com/a/0UzOPJ7

swift firebase firebase-realtime-database

share|improve this question

edited Mar 26 at 15:59

jeff porter

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asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

add a comment | 

2

I try to read data from firebase. I've made observeSingleEvent, but block "with" not works, why?

I try to debug and I notice that block with doesn't work.
userID has correct ID
and reference also correct

 var ref: DatabaseReference!
 var snapData: NSDictionary?
 var nameString = [String]()

 override func viewDidLoad() 
 super.viewDidLoad()

 ref = Database.database().reference()
 loadData()
 table.delegate = self
 table.dataSource = self
 table.register(UITableViewCell.self, forCellReuseIdentifier: "indentifire")
 view.addSubview(table)


 // Do any additional setup after loading the view.
 

 // ---------------------------------------------------

 //loading data from FireBase
 func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 self.snapData = snapshot.value as? NSDictionary
 )
 

 // delegate
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 var temp = 0
 for (_,val) in snapData! 
 if val as? String == "false" 
 temp += 1
 nameString.append(val as! String)
 
 
 return temp
 

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
 let cell = table.dequeueReusableCell(withIdentifier: "indentifire", for: indexPath)
 cell.textLabel!.text = nameString[indexPath.row]
 return cell
 ```

this is my database
![photo](https://imgur.com/a/0UzOPJ7

swift firebase firebase-realtime-database

share|improve this question

edited Mar 26 at 15:59

jeff porter

3,8481111 gold badges5353 silver badges105105 bronze badges

asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

add a comment | 

I try to read data from firebase. I've made observeSingleEvent, but block "with" not works, why?

I try to debug and I notice that block with doesn't work.
userID has correct ID
and reference also correct

 var ref: DatabaseReference!
 var snapData: NSDictionary?
 var nameString = [String]()

 override func viewDidLoad() 
 super.viewDidLoad()

 ref = Database.database().reference()
 loadData()
 table.delegate = self
 table.dataSource = self
 table.register(UITableViewCell.self, forCellReuseIdentifier: "indentifire")
 view.addSubview(table)


 // Do any additional setup after loading the view.
 

 // ---------------------------------------------------

 //loading data from FireBase
 func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 self.snapData = snapshot.value as? NSDictionary
 )
 

 // delegate
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 var temp = 0
 for (_,val) in snapData! 
 if val as? String == "false" 
 temp += 1
 nameString.append(val as! String)
 
 
 return temp
 

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
 let cell = table.dequeueReusableCell(withIdentifier: "indentifire", for: indexPath)
 cell.textLabel!.text = nameString[indexPath.row]
 return cell
 ```

this is my database
![photo](https://imgur.com/a/0UzOPJ7

swift firebase firebase-realtime-database

share|improve this question

edited Mar 26 at 15:59

jeff porter

3,8481111 gold badges5353 silver badges105105 bronze badges

asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

 var ref: DatabaseReference!
 var snapData: NSDictionary?
 var nameString = [String]()

 override func viewDidLoad() 
 super.viewDidLoad()

 ref = Database.database().reference()
 loadData()
 table.delegate = self
 table.dataSource = self
 table.register(UITableViewCell.self, forCellReuseIdentifier: "indentifire")
 view.addSubview(table)


 // Do any additional setup after loading the view.
 

 // ---------------------------------------------------

 //loading data from FireBase
 func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 self.snapData = snapshot.value as? NSDictionary
 )
 

 // delegate
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 var temp = 0
 for (_,val) in snapData! 
 if val as? String == "false" 
 temp += 1
 nameString.append(val as! String)
 
 
 return temp
 

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
 let cell = table.dequeueReusableCell(withIdentifier: "indentifire", for: indexPath)
 cell.textLabel!.text = nameString[indexPath.row]
 return cell
 ```

this is my database
![photo](https://imgur.com/a/0UzOPJ7

share|improve this question

edited Mar 26 at 15:59

jeff porter

3,8481111 gold badges5353 silver badges105105 bronze badges

asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

share|improve this question

edited Mar 26 at 15:59

jeff porter

3,8481111 gold badges5353 silver badges105105 bronze badges

asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

edited Mar 26 at 15:59

jeff porter

3,8481111 gold badges5353 silver badges105105 bronze badges

edited Mar 26 at 15:59

jeff porter

3,8481111 gold badges5353 silver badges105105 bronze badges

asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

asked Mar 26 at 8:06

Игорь СорокинИгорь Сорокин

2244 bronze badges

1 Answer
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0

The database operations work asynchronously. Map the data in loadData and reload the table view

func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 if let snapData = snapshot.value as? [String:Any] 
 self.nameString = snapData.values.compactMap $0 as? String
 DispatchQueue.main.async 
 self.table.reloadData()
 
 
 )

And in numberOfRowsInSection just return the number of items in nameString

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return nameString.count

share|improve this answer

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it works, Thank you!
  
  – Игорь Сорокин
  Mar 26 at 8:32
  

  
  
  
  

add a comment | 

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0

The database operations work asynchronously. Map the data in loadData and reload the table view

func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 if let snapData = snapshot.value as? [String:Any] 
 self.nameString = snapData.values.compactMap $0 as? String
 DispatchQueue.main.async 
 self.table.reloadData()
 
 
 )

And in numberOfRowsInSection just return the number of items in nameString

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return nameString.count

share|improve this answer

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it works, Thank you!
  
  – Игорь Сорокин
  Mar 26 at 8:32
  

  
  
  
  

add a comment | 

0

The database operations work asynchronously. Map the data in loadData and reload the table view

func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 if let snapData = snapshot.value as? [String:Any] 
 self.nameString = snapData.values.compactMap $0 as? String
 DispatchQueue.main.async 
 self.table.reloadData()
 
 
 )

And in numberOfRowsInSection just return the number of items in nameString

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return nameString.count

share|improve this answer

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it works, Thank you!
  
  – Игорь Сорокин
  Mar 26 at 8:32
  

  
  
  
  

add a comment | 

The database operations work asynchronously. Map the data in loadData and reload the table view

func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 if let snapData = snapshot.value as? [String:Any] 
 self.nameString = snapData.values.compactMap $0 as? String
 DispatchQueue.main.async 
 self.table.reloadData()
 
 
 )

And in numberOfRowsInSection just return the number of items in nameString

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return nameString.count

share|improve this answer

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges

func loadData() 
 let userID = Auth.auth().currentUser?.uid
 ref.child("users").child(userID!).observeSingleEvent(of: .value, with: (snapshot) in
 if let snapData = snapshot.value as? [String:Any] 
 self.nameString = snapData.values.compactMap $0 as? String
 DispatchQueue.main.async 
 self.table.reloadData()
 
 
 )

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return nameString.count

share|improve this answer

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges

answered Mar 26 at 8:15

vadianvadian

167k1919 gold badges185185 silver badges206206 bronze badges