I believe I learned in a tutorial here that the way to make a button fill the available space was to do this:

Button(action: {
  //
}) {
  Label("Button Example")
    .frame(maxWidth: .infinity)
}

If I'm not mistaken this did not cause errors at the time I learned it. But recently I am getting this error:

warning run: Invalid frame dimension (negative or non-finite).

Now I'm reading elsewhere that the solution is to replace .infinity with nil, however doing this produces completely different and unwanted behavior. While .inifinity produces the desired result of filling the available space, nil produces the same result as .none, which is also identical to not applying the .frame modifier with a maxWidth at all.

Does anyone know what the correct way to do this is now? I'm assuming that this has changed in the latest updates, and that the suggestion of using nil is just outdated information. I'm testing on iOS 16 with Xcode 14.0 beta 3.

Ok, I seem to have gotten the desired behavior without this error by using GeometryReader:

GeometryReader { geo in
  Button(action: {
    //
  }) {
    Label("Button Example")
      .frame(maxWidth: geo.size.width)
  }
}

While this produces the result I need, the code seems less than ideal compared to what was working before it started throwing this warning. If anyone knows a better way, I'd love to hear about it—thanks!