How to fix Swift warning in iOS "Multiple Closures with Trailing Closure Violation"

I am fairly new to Swift development and I’m getting the following warning:

Multiple Closures with Trailing Closure Violation: Trailing closure
syntax should not be used when passing more than one closure argument
(multiple_closures_with_trailing_closure).

I don’t really understand what the warnings means and how to fix it. I already googled and looked into other posts on Stackoverflow but couldn’t wrap my head around it.

My code looks like this:

Button(action: {
  address = "123 Fakestreet"
  onSubmit()
}) {
  Text("Start search")
}

Question: How can I refactor my code so the functionality stays the same but the warning goes away?

>Solution :

You simply need to use labels for both arguments and not use this short version where the last closure omits the label:

Button(action: {
    address = "123 Fakestreet"
    onSubmit()
}, label: {
    Text("Start search")
})

When things get more complicated I actually suggest you to refactor everything into methods. Then you can use it this way:

private func onAddressButtonPressed() {
    address = "123 Fakestreet"
    onSubmit()
}

Button(action: onAddressButtonPressed) {
    Text("Start search")
}

Note that there are no brackets after the method onAddressButtonPressed (not onAddressButtonPressed()).

You can do the same with label part when appropriate

private func onAddressButtonPressed() {
    address = "123 Fakestreet"
    onSubmit()
}

private func addressButtonContent() -> some View {
    Text("Start search")
}

Button(action: onAddressButtonPressed, label: addressButtonContent)