I want to pass helloVM.hello() to test2 view’s action.
But then I got this error Cannot convert value of type 'Void' to expected argument type '() -> Void' at test2(action: helloVM.hello()) in test1.

How should I fix HelloViewModel's hello()?

struct test1: View {
    @ObservedObject var helloVM = HelloViewModel()

    var body: some View{
       test2(action: helloVM.hello())
    }
}

struct test2: View {
    let action: ()-> Void

    var body: some View{
       Button(action: {
                  action()
              }, label: {
                  Text("hello")
               })
    }
}

class HelloViewModel: ObservableObject{
     func hello() -> Void{
         print("hello")
     }
}

I think hello() don’t have any argument and return Void.
But compiler says such error.

Thank you

>Solution :

test2(action: helloVM.hello) remove the parenthesis

This is because.

() -> Void means "function that returns Void"

helloVM.hello()

Runs the function and returns a value.

You want to return the function, not the return of the function.