Updating UILabel text programmatically using a function
so I am trying to update the UIlabel text using a func. I have seen few other questions like mine and I tried their method but it doesn't work. fun returns no value when used in the UIlabel. I have shown my code below.It has to be noted that when I use the function in viewdidload I can retrieve the data.
lazy var name: UILabel = {
let lb = UILabel()
lb.text? = getthename()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
func getthename() -> String {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
return wins
}
swift uilabel
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
asked Jan 20 at 15:22
SaraSara
54
|
show 4 more comments
so I am trying to update the UIlabel text using a func. I have seen few other questions like mine and I tried their method but it doesn't work. fun returns no value when used in the UIlabel. I have shown my code below.It has to be noted that when I use the function in viewdidload I can retrieve the data.
lazy var name: UILabel = {
let lb = UILabel()
lb.text? = getthename()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
func getthename() -> String {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
return wins
}
swift uilabel
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
asked Jan 20 at 15:22
SaraSara
54
if let getData = snapshot.valuecould you add a print there, and a print when you doreturn wins? Which one do you think is printed first, which one is really printed first? You are missing the asynchrone logic/concept.
– Larme
Jan 20 at 15:27
when I print it in the view did load it does print it correctly. when I use it in UILabel It doesnt return anything
– Sara
Jan 20 at 15:29
That's not what I asked. I asked you to replaceif let getData = snapshot.value as? [String:Any] {withprint("Something1"); if let getData = snapshot.value as? [String:Any] {andreturn winswithprint("Somethin2"); return wins, and ask you, in your opinion which print (Something1 or Something2) should appear in console first, and in reality which ones appear first.
– Larme
Jan 20 at 15:31
not sure if this is what you said: func getthename() { var wins : String = "" let ud = (Auth.auth().currentUser?.uid) self.ref = Database.database().reference() self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in print("Something1") }) print("Somethin2") }
– Sara
Jan 20 at 15:37
1
Finally, you pointed out the issue. Just before it was "it's not working", now you'll see that it's returned string is indeed empty when read. Because your method is asynchrone. Look for "Swift + Asynchrone + Closure" to manage that.
– Larme
Jan 20 at 15:42
|
show 4 more comments
so I am trying to update the UIlabel text using a func. I have seen few other questions like mine and I tried their method but it doesn't work. fun returns no value when used in the UIlabel. I have shown my code below.It has to be noted that when I use the function in viewdidload I can retrieve the data.
lazy var name: UILabel = {
let lb = UILabel()
lb.text? = getthename()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
func getthename() -> String {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
return wins
}
swift uilabel
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
asked Jan 20 at 15:22
SaraSara
54
so I am trying to update the UIlabel text using a func. I have seen few other questions like mine and I tried their method but it doesn't work. fun returns no value when used in the UIlabel. I have shown my code below.It has to be noted that when I use the function in viewdidload I can retrieve the data.
lazy var name: UILabel = {
let lb = UILabel()
lb.text? = getthename()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
func getthename() -> String {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
return wins
}
swift uilabel
swift uilabel
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
asked Jan 20 at 15:22
SaraSara
54
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
asked Jan 20 at 15:22
SaraSara
54
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
edited Jan 20 at 15:37
Yannick Loriot
6,34622850
6,34622850
asked Jan 20 at 15:22
SaraSara
54
asked Jan 20 at 15:22
SaraSara
54
asked Jan 20 at 15:22
SaraSara
54
54
if let getData = snapshot.valuecould you add a print there, and a print when you doreturn wins? Which one do you think is printed first, which one is really printed first? You are missing the asynchrone logic/concept.
– Larme
Jan 20 at 15:27
when I print it in the view did load it does print it correctly. when I use it in UILabel It doesnt return anything
– Sara
Jan 20 at 15:29
That's not what I asked. I asked you to replaceif let getData = snapshot.value as? [String:Any] {withprint("Something1"); if let getData = snapshot.value as? [String:Any] {andreturn winswithprint("Somethin2"); return wins, and ask you, in your opinion which print (Something1 or Something2) should appear in console first, and in reality which ones appear first.
– Larme
Jan 20 at 15:31
not sure if this is what you said: func getthename() { var wins : String = "" let ud = (Auth.auth().currentUser?.uid) self.ref = Database.database().reference() self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in print("Something1") }) print("Somethin2") }
– Sara
Jan 20 at 15:37
1
Finally, you pointed out the issue. Just before it was "it's not working", now you'll see that it's returned string is indeed empty when read. Because your method is asynchrone. Look for "Swift + Asynchrone + Closure" to manage that.
– Larme
Jan 20 at 15:42
|
show 4 more comments
if let getData = snapshot.valuecould you add a print there, and a print when you doreturn wins? Which one do you think is printed first, which one is really printed first? You are missing the asynchrone logic/concept.
– Larme
Jan 20 at 15:27
when I print it in the view did load it does print it correctly. when I use it in UILabel It doesnt return anything
– Sara
Jan 20 at 15:29
That's not what I asked. I asked you to replaceif let getData = snapshot.value as? [String:Any] {withprint("Something1"); if let getData = snapshot.value as? [String:Any] {andreturn winswithprint("Somethin2"); return wins, and ask you, in your opinion which print (Something1 or Something2) should appear in console first, and in reality which ones appear first.
– Larme
Jan 20 at 15:31
not sure if this is what you said: func getthename() { var wins : String = "" let ud = (Auth.auth().currentUser?.uid) self.ref = Database.database().reference() self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in print("Something1") }) print("Somethin2") }
– Sara
Jan 20 at 15:37
1
Finally, you pointed out the issue. Just before it was "it's not working", now you'll see that it's returned string is indeed empty when read. Because your method is asynchrone. Look for "Swift + Asynchrone + Closure" to manage that.
– Larme
Jan 20 at 15:42
if let getData = snapshot.value could you add a print there, and a print when you do return wins? Which one do you think is printed first, which one is really printed first? You are missing the asynchrone logic/concept.– Larme
Jan 20 at 15:27
if let getData = snapshot.value could you add a print there, and a print when you do return wins? Which one do you think is printed first, which one is really printed first? You are missing the asynchrone logic/concept.– Larme
Jan 20 at 15:27
when I print it in the view did load it does print it correctly. when I use it in UILabel It doesnt return anything
– Sara
Jan 20 at 15:29
when I print it in the view did load it does print it correctly. when I use it in UILabel It doesnt return anything
– Sara
Jan 20 at 15:29
That's not what I asked. I asked you to replace
if let getData = snapshot.value as? [String:Any] { with print("Something1"); if let getData = snapshot.value as? [String:Any] { and return wins with print("Somethin2"); return wins, and ask you, in your opinion which print (Something1 or Something2) should appear in console first, and in reality which ones appear first.– Larme
Jan 20 at 15:31
That's not what I asked. I asked you to replace
if let getData = snapshot.value as? [String:Any] { with print("Something1"); if let getData = snapshot.value as? [String:Any] { and return wins with print("Somethin2"); return wins, and ask you, in your opinion which print (Something1 or Something2) should appear in console first, and in reality which ones appear first.– Larme
Jan 20 at 15:31
not sure if this is what you said: func getthename() { var wins : String = "" let ud = (Auth.auth().currentUser?.uid) self.ref = Database.database().reference() self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in print("Something1") }) print("Somethin2") }
– Sara
Jan 20 at 15:37
not sure if this is what you said: func getthename() { var wins : String = "" let ud = (Auth.auth().currentUser?.uid) self.ref = Database.database().reference() self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in print("Something1") }) print("Somethin2") }
– Sara
Jan 20 at 15:37
1
1
Finally, you pointed out the issue. Just before it was "it's not working", now you'll see that it's returned string is indeed empty when read. Because your method is asynchrone. Look for "Swift + Asynchrone + Closure" to manage that.
– Larme
Jan 20 at 15:42
Finally, you pointed out the issue. Just before it was "it's not working", now you'll see that it's returned string is indeed empty when read. Because your method is asynchrone. Look for "Swift + Asynchrone + Closure" to manage that.
– Larme
Jan 20 at 15:42
|
show 4 more comments
1 Answer
1
active
oldest
votes
Try replacing this line of code
lb.text? = getthename()
With lb.text = getthename()
You're currently using optional unwrapping by using the "?" symbol and it is causing that line to essentially equate to nil = getthename()
Also, as mentioned by @Larme the following code is actually asynchronous:
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
Rather than trying to set your label's text within the lazy variable initializer I would recommend you set it elsewhere. You can update the getthename() function to use a reference to the label to update the label's text after the call to observeSingleEvent() has returned.
So something like this
lazy var name: UILabel = {
let lb = UILabel()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
Then the getthename() function can be changed to the following. You can call the function from anywhere and it will set the label for you.
func getthename() {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
if let getData = snapshot.value as? [String:Any] {
self?.name.text = (getData["lastName "] as? String)!
}
})
}
Please notice the [weak self] in the observeSingleEvent() closure as with any asynchronous code you need to check to make sure whether the right variables are still available.
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
1
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
add a comment |
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1 Answer
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1 Answer
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active
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oldest
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active
oldest
votes
Try replacing this line of code
lb.text? = getthename()
With lb.text = getthename()
You're currently using optional unwrapping by using the "?" symbol and it is causing that line to essentially equate to nil = getthename()
Also, as mentioned by @Larme the following code is actually asynchronous:
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
Rather than trying to set your label's text within the lazy variable initializer I would recommend you set it elsewhere. You can update the getthename() function to use a reference to the label to update the label's text after the call to observeSingleEvent() has returned.
So something like this
lazy var name: UILabel = {
let lb = UILabel()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
Then the getthename() function can be changed to the following. You can call the function from anywhere and it will set the label for you.
func getthename() {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
if let getData = snapshot.value as? [String:Any] {
self?.name.text = (getData["lastName "] as? String)!
}
})
}
Please notice the [weak self] in the observeSingleEvent() closure as with any asynchronous code you need to check to make sure whether the right variables are still available.
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
1
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
add a comment |
Try replacing this line of code
lb.text? = getthename()
With lb.text = getthename()
You're currently using optional unwrapping by using the "?" symbol and it is causing that line to essentially equate to nil = getthename()
Also, as mentioned by @Larme the following code is actually asynchronous:
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
Rather than trying to set your label's text within the lazy variable initializer I would recommend you set it elsewhere. You can update the getthename() function to use a reference to the label to update the label's text after the call to observeSingleEvent() has returned.
So something like this
lazy var name: UILabel = {
let lb = UILabel()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
Then the getthename() function can be changed to the following. You can call the function from anywhere and it will set the label for you.
func getthename() {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
if let getData = snapshot.value as? [String:Any] {
self?.name.text = (getData["lastName "] as? String)!
}
})
}
Please notice the [weak self] in the observeSingleEvent() closure as with any asynchronous code you need to check to make sure whether the right variables are still available.
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
1
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
add a comment |
Try replacing this line of code
lb.text? = getthename()
With lb.text = getthename()
You're currently using optional unwrapping by using the "?" symbol and it is causing that line to essentially equate to nil = getthename()
Also, as mentioned by @Larme the following code is actually asynchronous:
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
Rather than trying to set your label's text within the lazy variable initializer I would recommend you set it elsewhere. You can update the getthename() function to use a reference to the label to update the label's text after the call to observeSingleEvent() has returned.
So something like this
lazy var name: UILabel = {
let lb = UILabel()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
Then the getthename() function can be changed to the following. You can call the function from anywhere and it will set the label for you.
func getthename() {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
if let getData = snapshot.value as? [String:Any] {
self?.name.text = (getData["lastName "] as? String)!
}
})
}
Please notice the [weak self] in the observeSingleEvent() closure as with any asynchronous code you need to check to make sure whether the right variables are still available.
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
Try replacing this line of code
lb.text? = getthename()
With lb.text = getthename()
You're currently using optional unwrapping by using the "?" symbol and it is causing that line to essentially equate to nil = getthename()
Also, as mentioned by @Larme the following code is actually asynchronous:
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in
if let getData = snapshot.value as? [String:Any] {
wins = (getData["lastName "] as? String)!
}
})
Rather than trying to set your label's text within the lazy variable initializer I would recommend you set it elsewhere. You can update the getthename() function to use a reference to the label to update the label's text after the call to observeSingleEvent() has returned.
So something like this
lazy var name: UILabel = {
let lb = UILabel()
lb.lineBreakMode = NSLineBreakMode.byWordWrapping
lb.textColor = .mainGreen
lb.textAlignment = .left
lb.font = UIFont.boldSystemFont(ofSize:12.0)
return lb
}()
Then the getthename() function can be changed to the following. You can call the function from anywhere and it will set the label for you.
func getthename() {
var wins : String = ""
let ud = (Auth.auth().currentUser?.uid)
self.ref = Database.database().reference()
self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
if let getData = snapshot.value as? [String:Any] {
self?.name.text = (getData["lastName "] as? String)!
}
})
}
Please notice the [weak self] in the observeSingleEvent() closure as with any asynchronous code you need to check to make sure whether the right variables are still available.
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
edited Jan 20 at 16:07
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
answered Jan 20 at 15:51
Robert BarberRobert Barber
365
365
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
1
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
add a comment |
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
1
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I have tried that also. Doesnt work
– Sara
Jan 20 at 15:52
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
I've updated my answer for you.
– Robert Barber
Jan 20 at 16:07
1
1
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
oh wow worked beautifully.
– Sara
Jan 20 at 16:15
add a comment |
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if let getData = snapshot.valuecould you add a print there, and a print when you doreturn wins? Which one do you think is printed first, which one is really printed first? You are missing the asynchrone logic/concept.– Larme
Jan 20 at 15:27
when I print it in the view did load it does print it correctly. when I use it in UILabel It doesnt return anything
– Sara
Jan 20 at 15:29
That's not what I asked. I asked you to replace
if let getData = snapshot.value as? [String:Any] {withprint("Something1"); if let getData = snapshot.value as? [String:Any] {andreturn winswithprint("Somethin2"); return wins, and ask you, in your opinion which print (Something1 or Something2) should appear in console first, and in reality which ones appear first.– Larme
Jan 20 at 15:31
not sure if this is what you said: func getthename() { var wins : String = "" let ud = (Auth.auth().currentUser?.uid) self.ref = Database.database().reference() self.ref.child("Users").child(ud!).observeSingleEvent(of: .value, with: {(snapshot) in print("Something1") }) print("Somethin2") }
– Sara
Jan 20 at 15:37
1
Finally, you pointed out the issue. Just before it was "it's not working", now you'll see that it's returned string is indeed empty when read. Because your method is asynchrone. Look for "Swift + Asynchrone + Closure" to manage that.
– Larme
Jan 20 at 15:42