I’m having trouble trying to run a function whenever a State-wrapped string is changed. Basically, whenever this string is changed, I need to check if the value matches a possible answer.

Because this property is wrapped with @State, property observers don’t work for triggering the desired function whenever the string is updated.

Pressing the button under the Text View successfully updates the Text View, but I can’t actually call checkValue() using the .onChange modifier on the Text view because I get this error:

“Cannot convert value of type ’some View’ to expected argument type ’Text’.”

Struct ContentView: View {

@State private var displayedValue = “”
/*Just a class that handles data shared between different views and  functions for managing game state*/
@StateObject gameBrains = GameBrains()

Var body -> some View {

Text(displayedValue)
.onChange(of: displayedValue, perform: checkValue())
Button(“Update Display Value”) {
//code that adds to the displayedValue property
}//button
}//body

Func checkValue() 
If _displayedValue.wrappedValue ==gameBrains.GetExpectedValue()
GameBrains.triggerWin()
displayedValue = “"
}//conditional
}//struct

If I am not wrong..try the bellow

.onChange(of: displayedValue, action: checkValue)

That doesn't work either. It actually throws an error saying that 'perform:' was expected, rather than 'action:'. Any other ideas?

this?

.onChange(of: displayedValue, perform: checkValue)

Thank you both for the help. I really appreciate it.