Cannot invoke 'value' with an argument list of type '(String)'
Solution 1
You probably need to change them to (message as AnyObject).value(forKey:"···")
(adding the forKey:
label).
Do you know what kind of object message
is supposed to be? Repeatedly casting it to AnyObject
is odd. It would be cleaner to create a new variable - let messageObject = message as AnyObject
and then call messageObject.value(forKey:"···")
. (I suspect you really want to cast it to Dictionary
or something like that, in which case you can do messageDictionary["···"]
instead of calling value(forKey:)
.)
Also, in Swift you can do this to reduce redundancy even more:
if let content = messageObject.value(forKey:"content") as? String {
stringContent = content
}
Solution 2
If message
is json dictionary then cast it to [String:Any]
and then use subscript with it.
if let dic = message as? [String:Any] {
stringContent = dic["content"] as? String ?? ""
}
OR
If message
is type of Messages
then you can access its property directly using message.content
and same way you can access other properties too.
stringContent = message.content
![Quentin Del](https://lh3.googleusercontent.com/-dpqN0PH8bRk/AAAAAAAAAAI/AAAAAAAAAEA/g-gIm4oF1_A/photo.jpg?sz=256)
Comments
-
Quentin Del about 2 years
I am a beginner at Swift and I am migrating an app to Swift 3.0
I keep having this error and I have no idea how to solve it.
"Cannot invoke 'value' with an argument list of type '(String)'"
It is displayed at nearly each line of this snippet. Do you have any idea where it could come from? Thanks a lot
if ((message as AnyObject).value("content") != nil){ stringContent = (message as AnyObject).value("content") as? String } if ((message as AnyObject).value("sender_uuid") != nil){ stringSenderUuid = (message as AnyObject).value("sender_uuid") as? String } if ((message as AnyObject).value("recipient_uuid") != nil){ stringRecipientUuid = (message as AnyObject).value("recipient_uuid") as! String } if ((message as AnyObject).value("date") != nil){ if let result_number = (message as AnyObject).value("date") as? NSNumber { stringDate = "\(result_number)" } else { stringDate = (message as AnyObject).value("date") as! String } }
As requested here is more information about Messages
class Messages: Object { dynamic var channel_name = "" dynamic var content = "" dynamic var sender_uuid = "" dynamic var recipient_uuid = "" dynamic var date = "" dynamic var message_uuid = "" override class func primaryKey() -> String? { return "message_uuid" } } let message = Messages() message.channel_name=channel_name message.content=stringContent message.sender_uuid = stringSenderUuid message.recipient_uuid = stringRecipientUuid message.date = stringDate message.message_uuid = stringUuid
Here is even more information
// initialize with nothing var stringContent = " " var stringSenderUuid = " " var stringRecipientUuid = " " var stringDate = " " var stringUuid = " " // We check for existence in the dictionnary if (message["content"] != nil){ stringContent = message["content"] as! String } if (message["sender_uuid"] != nil){ stringSenderUuid = message["sender_uuid"] as! String } if (message["recipient_uuid"] != nil){ stringRecipientUuid = message["recipient_uuid"] as! String } if (message["date"] != nil){ if let result_number = message.value(forKey: "date") as? NSNumber { stringDate = "\(result_number)" } else { stringDate = message.value(forKey: "date") as! String } } if (message["uuid"] != nil){ stringUuid = message["uuid"] as! String }
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Quentin Del over 7 yearsAdding "forKey" fixed the issue.
-
Quentin Del over 7 yearsWhen I try if ((message.content != nil){ stringContent = ((message as AnyObject).value(forKey:"content") as? String)! } it says Value of type 'NSFastEnumerationIterator.Element' (aka 'Any') has no member ‘content' and proposes to change to if (((message as AnyObject).content != nil)
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Nirav D over 7 years@QuentinDel You need to show how you are getting value in
message
means how you have initialized themessage
that will give us idea. -
Quentin Del over 7 yearsI have updated my post with more information about message. The issue is fixed now but I am always eager to learn how to write better code. Thanks a lot for your help.
-
Nirav D over 7 years@QuentinDel You still don't get it what I have ask is the var
message
that you have used here(message as AnyObject).value("content") != nil)
. I'm asking about that message variable How you have initailized it you haven't add that code. If it is dictionary then subscript will work no need to type cast it to Anyobject and no need to usevalueForKey
.