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CupertinoAppBar

An iOS-styled app bar.

Note

The alignment of the title depends on whether this app bar is large or not. If it is True, the title is left-aligned and if it is False (the default), the title is centered.

Inherits: Control

Properties

Examples​

Live example

Basic Example​

import flet as ft


def main(page: ft.Page):
    page.theme_mode = ft.ThemeMode.LIGHT

    page.appbar = ft.CupertinoAppBar(
        leading=ft.Icon(ft.Icons.PALETTE, color=ft.Colors.ON_SECONDARY),
        title=ft.Text("CupertinoAppBar Example"),
        trailing=ft.Icon(ft.Icons.WB_SUNNY_OUTLINED, color=ft.Colors.ON_SECONDARY),
        automatic_background_visibility=False,
        bgcolor=ft.Colors.SECONDARY,
        brightness=ft.Brightness.LIGHT,
    )

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


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

App bar with theme mode toggle​

import flet as ft


def main(page: ft.Page):
    page.theme_mode = ft.ThemeMode.LIGHT

    def handle_theme_mode_toggle(_: ft.Event[ft.IconButton]):
        page.theme_mode = (
            ft.ThemeMode.DARK
            if page.theme_mode == ft.ThemeMode.LIGHT
            else ft.ThemeMode.LIGHT
        )
        theme_mode_button.icon = (
            ft.Icons.WB_SUNNY_OUTLINED
            if page.theme_mode == ft.ThemeMode.LIGHT
            else ft.Icons.WB_SUNNY
        )

    theme_mode_button = ft.IconButton(
        icon=(
            ft.Icons.WB_SUNNY_OUTLINED
            if page.theme_mode == ft.ThemeMode.LIGHT
            else ft.Icons.WB_SUNNY
        ),
        icon_color=ft.Colors.ON_INVERSE_SURFACE,
        on_click=handle_theme_mode_toggle,
    )

    page.appbar = ft.CupertinoAppBar(
        automatic_background_visibility=False,
        leading=ft.Icon(ft.Icons.PALETTE, color=ft.Colors.ON_INVERSE_SURFACE),
        bgcolor=ft.Colors.INVERSE_SURFACE,
        trailing=theme_mode_button,
        title=ft.Text("CupertinoAppBar Example", color=ft.Colors.ON_INVERSE_SURFACE),
    )

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


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

Properties​

automatic_background_visibilityclass-attributeinstance-attribute​

automatic_background_visibility: Optional[bool] = None

Whether the navigation bar should appear transparent when content is scrolled under it.

If False, the navigation bar will display its bgcolor.

automatically_imply_leadingclass-attributeinstance-attribute​

automatically_imply_leading: Optional[bool] = None

Whether we should try to imply the leading control if None.

  • If True and leading is None, the app bar will automatically determine an appropriate leading control.
  • If False and leading is None, the space is allocated to the title.
  • If a leading control is provided, this parameter has no effect.

automatically_imply_titleclass-attributeinstance-attribute​

automatically_imply_title: Optional[bool] = None

Whether we should try to imply the title control if None.

  • If True and title is None, a Text control containing the current route's title will be automatically filled in.
  • If the title is not None, this parameter has no effect.

bgcolorclass-attributeinstance-attribute​

bgcolor: Optional[ColorValue] = None

The fill color to use for this app bar.

Default color is defined by current theme.

borderclass-attributeinstance-attribute​

border: Optional[Border] = None

The border of the app bar. By default, a single pixel bottom border side is rendered.

brightnessclass-attributeinstance-attribute​

brightness: Optional[Brightness] = None

The brightness of the specified bgcolor.

Setting this value changes the style of the system status bar. It is typically used to increase the contrast ratio of the system status bar over bgcolor.

If None (the default), its value will be inferred from the relative luminance of the bgcolor.

enable_background_filter_blurclass-attributeinstance-attribute​

enable_background_filter_blur: Optional[bool] = None

Whether to have a blur effect when a non-opaque bgcolor is used.

This will only be respected when automatic_background_visibility is False or until content scrolls under the navigation bar.

largeclass-attributeinstance-attribute​

large: bool = False

Whether to use a large app bar layout.

If True, the title is left-aligned; if False, the title is centered.

leadingclass-attributeinstance-attribute​

leading: Optional[Control] = None

A control to display at the start of this app bar.

Typically the leading control is an Icon or an IconButton .

If it is None and automatically_imply_leading is True, an appropriate button will be automatically created.

paddingclass-attributeinstance-attribute​

padding: Optional[PaddingValue] = None

Defines the padding for the contents of the app bar.

If None, the app bar will adopt the following defaults:

  • vertically, contents will be sized to the same height as the app bar itself minus the status bar.
  • horizontally, padding will be 16 pixels according to iOS specifications unless the leading widget is an automatically inserted back button, in which case the padding will be 0.
Note

Vertical padding (top and bottom) won't change the height of this app bar.

previous_page_titleclass-attributeinstance-attribute​

previous_page_title: Optional[str] = None

Manually specify the previous route's title when automatically implying the leading back button.

Overrides the text shown with the back chevron instead of automatically showing the previous route's title when automatically_imply_leading is True.

Note

Has no effect if leading is not None or if automatically_imply_leading is False.

titleclass-attributeinstance-attribute​

title: Optional[StrOrControl] = None

A string or a control to display in the middle of this app bar.

Typically a Text.

trailingclass-attributeinstance-attribute​

trailing: Optional[Control] = None

A Control to place at the end of the app bar.

Typically used for actions such as searching or editing.

transition_between_routesclass-attributeinstance-attribute​

transition_between_routes: bool = True

Determines whether the app bar transitions between routes.

If True, this app bar will animate on top of route transitions when the destination route also contains a CupertinoAppBar or CupertinoSliverAppBar with transition_between_routes set to True.

This transition also occurs during edge back swipe gestures, mimicking native iOS behavior.

Note

When enabled, only one app bar can be present per route unless a hero_tag is specified.