Function button 

pub fn button(label: &str, callback: impl Fn() + 'static) -> ViewHandle

Create a Button with a text label and an action.

The action may capture. It was fn() — a bare pointer stored as the context — which meant a button could not know anything about where it was: a row’s checkmark could not be told which row it belonged to, and every list had to route through a global. button_labelled next door already boxed its closure; this now does the same.

Examples found in repository

examples/ios_app.rs (line 241)

fn controls() -> views::ViewHandle {
    views::vstack_spacing(
        &[
            // Two toggles, both starting `false`: one bound to Rust-owned
            // state, one a constant. If they ever disagree on screen, the
            // binding's getter is at fault rather than the control.
            views::toggle_bound("Bound to Rust state", switch_state()),
            views::toggle("Constant false", false),
            views::hstack_spacing(
                &[
                    label_text(&format!("{:.2}", slider_state().get()), 14.0, None, 0.9),
                    views::slider_bound(slider_state(), 0.0, 1.0),
                ],
                10.0,
            ),
            views::stepper_bound(
                &format!("Stepper: {:.0}", stepper_state().get()),
                stepper_state(),
                0.0,
                10.0,
                1.0,
            ),
            // Reads the stepper's Rust value. A `ProgressView` takes a plain
            // number rather than a binding, so it can only ever show what it
            // was built with — which is fine now that every write rebuilds the
            // body from current state.
            views::progress(stepper_state().get(), 10.0),
            views::hstack_spacing(
                &[
                    views::button_style(
                        &views::button("Bordered", on_tap),
                        views::ButtonStyle::Bordered,
                    ),
                    views::button_style(
                        &views::button("Glass", on_tap),
                        views::ButtonStyle::Glass,
                    ),
                ],
                12.0,
            ),
            views::textfield("A text field", ""),
        ],
        12.0,
    )
}