CupertinoNavigationBar

An iOS-styled bottom navigation tab bar.

Navigation bars offer a persistent and convenient way to switch between primary destinations in an app.

Inherits: LayoutControl

Properties

• active_color(ColorValue | None) –

  The foreground color of the icon and title of the selected destination.

• bgcolor(ColorValue | None) –

  The color of the navigation bar itself.

• border(Border | None) –

  Defines the border of this navigation bar.

• destinations(list[NavigationBarDestination]) –

  The destinations of this navigation bar.

• icon_size(Number) –

  The size of all destination icons.

• inactive_color(ColorValue) –

  The foreground color of the icon and title of the unselected destinations.

• selected_index(int) –

  The index into destinations for the currently selected NavigationBarDestination.

Events

• on_change(ControlEventHandler[CupertinoNavigationBar] | None) –

  Called when selected destination changed.

Examples

Live example

Basic Example

import flet as ft


def main(page: ft.Page):
    page.title = "CupertinoNavigationBar Example"

    page.navigation_bar = ft.CupertinoNavigationBar(
        bgcolor=ft.Colors.AMBER_100,
        inactive_color=ft.Colors.GREY,
        active_color=ft.Colors.BLACK,
        on_change=lambda e: print("Selected tab:", e.control.selected_index),
        destinations=[
            ft.NavigationBarDestination(
                icon=ft.Icons.EXPLORE_OUTLINED,
                selected_icon=ft.Icons.EXPLORE,
                label="Explore",
            ),
            ft.NavigationBarDestination(
                icon=ft.Icons.COMMUTE_OUTLINED,
                selected_icon=ft.Icons.COMMUTE,
                label="Commute",
            ),
            ft.NavigationBarDestination(
                icon=ft.Icons.BOOKMARK_BORDER,
                selected_icon=ft.Icons.BOOKMARK,
                label="Favorites",
            ),
        ],
    )

    page.add(
        ft.SafeArea(
            content=ft.Text("Body!"),
        )
    )


if __name__ == "__main__":
    ft.run(main)

Wired navigation bar

import flet as ft


def main(page: ft.Page):
    page.title = "CupertinoNavigationBar Example"

    body_text = ft.Text("Explore!")

    def handle_nav_destination_change(e: ft.Event[ft.CupertinoNavigationBar]):
        if e.control.selected_index == 0:
            body_text.value = "Explore!"
        elif e.control.selected_index == 1:
            body_text.value = "Find Your Way!"
        else:
            body_text.value = "Your Favorites!"

    page.navigation_bar = ft.CupertinoNavigationBar(
        bgcolor=ft.Colors.AMBER_100,
        inactive_color=ft.Colors.GREY,
        active_color=ft.Colors.BLACK,
        on_change=handle_nav_destination_change,
        destinations=[
            ft.NavigationBarDestination(
                icon=ft.Icons.EXPLORE_OUTLINED,
                selected_icon=ft.Icons.EXPLORE,
                label="Explore",
            ),
            ft.NavigationBarDestination(
                icon=ft.Icons.COMMUTE_OUTLINED,
                selected_icon=ft.Icons.COMMUTE,
                label="Commute",
            ),
            ft.NavigationBarDestination(
                icon=ft.Icons.BOOKMARK_BORDER,
                selected_icon=ft.Icons.BOOKMARK,
                label="Favorites",
            ),
        ],
    )

    page.add(
        ft.SafeArea(
            content=body_text,
        )
    )


if __name__ == "__main__":
    ft.run(main)

Properties

active_color class-attribute instance-attribute

active_color: ColorValue | None = None

The foreground color of the icon and title of the selected destination.

bgcolor class-attribute instance-attribute

bgcolor: ColorValue | None = None

The color of the navigation bar itself.

border class-attribute instance-attribute

border: Border | None = None

Defines the border of this navigation bar.

destinations instance-attribute

destinations: list[NavigationBarDestination]

The destinations of this navigation bar.

Raises:

• ValueError –

  If it does not contain at least two visible NavigationBarDestinations.

icon_size class-attribute instance-attribute

icon_size: Number = 30

The size of all destination icons.

inactive_color class-attribute instance-attribute

inactive_color: ColorValue = INACTIVE_GRAY

The foreground color of the icon and title of the unselected destinations.

selected_index class-attribute instance-attribute

selected_index: int = 0

The index into destinations for the currently selected NavigationBarDestination.

Raises:

• IndexError –

  If it is not greater than or equal to 0.

• IndexError –

  If it is not less than the length of visible destinations.

Events

on_change class-attribute instance-attribute

on_change: (
    ControlEventHandler[CupertinoNavigationBar] | None
) = None

Called when selected destination changed.