CupertinoSliverNavigationBar class Null safety
An iOS-styled navigation bar with iOS-11-style large titles using slivers.
The CupertinoSliverNavigationBar must be placed in a sliver group such as the CustomScrollView.
This navigation bar consists of two sections, a pinned static section on top and a sliding section containing iOS-11-style large title below it.
It should be placed at top of the screen and automatically accounts for the iOS status bar.
Minimally, a largeTitle widget will appear in the middle of the app bar when the sliver is collapsed and transfer to the area below in larger font when the sliver is expanded.
For advanced uses, an optional middle widget can be supplied to show a different widget in the middle of the navigation bar when the sliver is collapsed.
Like CupertinoNavigationBar, it also supports a leading and trailing widget on the static section on top that remains while scrolling.
The leading widget will automatically be a back chevron icon button (or a close button in case of a fullscreen dialog) to pop the current route if none is provided and automaticallyImplyLeading is true (true by default).
The largeTitle widget will automatically be a title text from the current CupertinoPageRoute if none is provided and automaticallyImplyTitle is true (true by default).
When transitionBetweenRoutes is true, this navigation bar will transition on top of the routes instead of inside them if the route being transitioned to also has a CupertinoNavigationBar or a CupertinoSliverNavigationBar with transitionBetweenRoutes set to true. If transitionBetweenRoutes is true, none of the Widget parameters can contain any GlobalKeys in their subtrees since those widgets will exist in multiple places in the tree simultaneously.
By default, only one CupertinoNavigationBar or CupertinoSliverNavigationBar should be present in each PageRoute to support the default transitions. Use transitionBetweenRoutes or heroTag to customize the transition behavior for multiple navigation bars per route.
CupertinoSliverNavigationBar has its text scale factor set to 1.0 by default
and does not respond to text scale factor changes from the operating system,
to match the native iOS behavior. To override this behavior, wrap each of the
CupertinoSliverNavigationBar's components inside a MediaQuery with the
desired MediaQueryData.textScaleFactor value. The text scale factor value
from the operating system can be retrieved in many ways, such as querying
MediaQuery.textScaleFactorOf against CupertinoApp's BuildContext.
The stretch parameter determines whether the nav bar should stretch to
fill the over-scroll area. The nav bar can still expand and contract as the
user scrolls, but it will also stretch when the user over-scrolls if the
stretch value is true. Defaults to false.
flutter create --sample=cupertino.CupertinoSliverNavigationBar.1 mysample
See also:
- CupertinoNavigationBar, an iOS navigation bar for use on non-scrolling pages.
- CustomScrollView, a ScrollView that creates custom scroll effects using slivers.
- developer.apple.com/design/human-interface-guidelines/ios/bars/navigation-bars/
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- CupertinoSliverNavigationBar
Constructors
-
Creates a navigation bar for scrolling lists.
const
Properties
- automaticallyImplyLeading → bool
-
Controls whether we should try to imply the leading widget if null.
final
- automaticallyImplyTitle → bool
-
Controls whether we should try to imply the largeTitle widget if null.
final
- backgroundColor → Color?
-
The background color of the navigation bar. If it contains transparency, the
tab bar will automatically produce a blurring effect to the content
behind it.
final
- border → Border?
-
The border of the navigation bar. By default renders a single pixel bottom border side.
final
- brightness → Brightness?
-
The brightness of the specified backgroundColor.
final
- hashCode → int
- The hash code for this object.
- heroTag → Object
-
Tag for the navigation bar's Hero widget if transitionBetweenRoutes is true.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- largeTitle → Widget?
-
The navigation bar's title.
final
- leading → Widget?
-
Widget to place at the start of the navigation bar. Normally a back button
for a normal page or a cancel button for full page dialogs.
final
- middle → Widget?
-
A widget to place in the middle of the static navigation bar instead of
the largeTitle.
final
- opaque → bool
-
True if the navigation bar's background color has no transparency.
read-only
- padding → EdgeInsetsDirectional?
-
Padding for the contents of the navigation bar.
final
- previousPageTitle → String?
-
Manually specify the previous route's title when automatically implying
the leading back button.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- stretch → bool
-
Whether the nav bar should stretch to fill the over-scroll area.
final
- trailing → Widget?
-
Widget to place at the end of the navigation bar. Normally additional actions
taken on the page such as a search or edit function.
final
- transitionBetweenRoutes → bool
-
Whether to transition between navigation bars.
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< CupertinoSliverNavigationBar> -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNodeobjects describing this node's children.protected">@protectedinherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited