CupertinoTextField class Null safety

An iOS-style text field.

A text field lets the user enter text, either with a hardware keyboard or with an onscreen keyboard.

This widget corresponds to both a UITextField and an editable UITextView on iOS.

The text field calls the onChanged callback whenever the user changes the text in the field. If the user indicates that they are done typing in the field (e.g., by pressing a button on the soft keyboard), the text field calls the onSubmitted callback.

It's important to always use characters when dealing with user input text that may contain complex characters. This will ensure that extended grapheme clusters and surrogate pairs are treated as single characters, as they appear to the user.

For example, when finding the length of some user input, use string.characters.length. Do NOT use string.length or even string.runes.length. For the complex character "👨‍👩‍👦", this appears to the user as a single character, and string.characters.length intuitively returns 1. On the other hand, string.length returns 8, and string.runes.length returns 5!

This example shows how to set the initial value of the CupertinoTextField using a controller that already contains some text.

To create a local project with this code sample, run:
flutter create --sample=cupertino.CupertinoTextField.1 mysample

The controller can also control the selection and composing region (and to observe changes to the text, selection, and composing region).

The text field has an overridable decoration that, by default, draws a rounded rectangle border around the text field. If you set the decoration property to null, the decoration will be removed entirely.

When the widget has focus, it will prevent itself from disposing via its underlying EditableText's AutomaticKeepAliveClientMixin.wantKeepAlive in order to avoid losing the selection. Removing the focus will allow it to be disposed.

Remember to call TextEditingController.dispose when it is no longer needed. This will ensure we discard any resources used by the object.

Keep the caret visible when focused

When focused, this widget will make attempts to keep the text area and its caret (even when showCursor is false) visible, on these occasions:

When the user focuses this text field and it is not readOnly.
When the user changes the selection of the text field, or changes the text when the text field is not readOnly.
When the virtual keyboard pops up.

Constructors

CupertinoTextField({Key? key, TextEditingController? controller, FocusNode? focusNode, BoxDecoration? decoration = _kDefaultRoundedBorderDecoration, EdgeInsetsGeometry padding = const EdgeInsets.all(6.0), String? placeholder, TextStyle? placeholderStyle = const TextStyle(fontWeight: FontWeight.w400, color: CupertinoColors.placeholderText), Widget? prefix, OverlayVisibilityMode prefixMode = OverlayVisibilityMode.always, Widget? suffix, OverlayVisibilityMode suffixMode = OverlayVisibilityMode.always, OverlayVisibilityMode clearButtonMode = OverlayVisibilityMode.never, TextInputType? keyboardType, TextInputAction? textInputAction, TextCapitalization textCapitalization = TextCapitalization.none, TextStyle? style, StrutStyle? strutStyle, TextAlign textAlign = TextAlign.start, TextAlignVertical? textAlignVertical, TextDirection? textDirection, bool readOnly = false, ToolbarOptions? toolbarOptions, bool? showCursor, bool autofocus = false, String obscuringCharacter = '•', bool obscureText = false, bool autocorrect = true, SmartDashesType? smartDashesType, SmartQuotesType? smartQuotesType, bool enableSuggestions = true, int? maxLines = 1, int? minLines, bool expands = false, int? maxLength, MaxLengthEnforcement? maxLengthEnforcement, ValueChanged<String>? onChanged, VoidCallback? onEditingComplete, ValueChanged<String>? onSubmitted, TapRegionCallback? onTapOutside, List<TextInputFormatter>? inputFormatters, bool? enabled, double cursorWidth = 2.0, double? cursorHeight, Radius cursorRadius = const Radius.circular(2.0), Color? cursorColor, BoxHeightStyle selectionHeightStyle = ui.BoxHeightStyle.tight, BoxWidthStyle selectionWidthStyle = ui.BoxWidthStyle.tight, Brightness? keyboardAppearance, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), DragStartBehavior dragStartBehavior = DragStartBehavior.start, bool? enableInteractiveSelection, TextSelectionControls? selectionControls, GestureTapCallback? onTap, ScrollController? scrollController, ScrollPhysics? scrollPhysics, Iterable<String>? autofillHints = const <String>[], Clip clipBehavior = Clip.hardEdge, String? restorationId, bool scribbleEnabled = true, bool enableIMEPersonalizedLearning = true}): Creates an iOS-style text field.
const
CupertinoTextField.borderless({Key? key, TextEditingController? controller, FocusNode? focusNode, BoxDecoration? decoration, EdgeInsetsGeometry padding = const EdgeInsets.all(6.0), String? placeholder, TextStyle? placeholderStyle = _kDefaultPlaceholderStyle, Widget? prefix, OverlayVisibilityMode prefixMode = OverlayVisibilityMode.always, Widget? suffix, OverlayVisibilityMode suffixMode = OverlayVisibilityMode.always, OverlayVisibilityMode clearButtonMode = OverlayVisibilityMode.never, TextInputType? keyboardType, TextInputAction? textInputAction, TextCapitalization textCapitalization = TextCapitalization.none, TextStyle? style, StrutStyle? strutStyle, TextAlign textAlign = TextAlign.start, TextAlignVertical? textAlignVertical, TextDirection? textDirection, bool readOnly = false, ToolbarOptions? toolbarOptions, bool? showCursor, bool autofocus = false, String obscuringCharacter = '•', bool obscureText = false, bool autocorrect = true, SmartDashesType? smartDashesType, SmartQuotesType? smartQuotesType, bool enableSuggestions = true, int? maxLines = 1, int? minLines, bool expands = false, int? maxLength, MaxLengthEnforcement? maxLengthEnforcement, ValueChanged<String>? onChanged, VoidCallback? onEditingComplete, ValueChanged<String>? onSubmitted, TapRegionCallback? onTapOutside, List<TextInputFormatter>? inputFormatters, bool? enabled, double cursorWidth = 2.0, double? cursorHeight, Radius cursorRadius = const Radius.circular(2.0), Color? cursorColor, BoxHeightStyle selectionHeightStyle = ui.BoxHeightStyle.tight, BoxWidthStyle selectionWidthStyle = ui.BoxWidthStyle.tight, Brightness? keyboardAppearance, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), DragStartBehavior dragStartBehavior = DragStartBehavior.start, bool? enableInteractiveSelection, TextSelectionControls? selectionControls, GestureTapCallback? onTap, ScrollController? scrollController, ScrollPhysics? scrollPhysics, Iterable<String>? autofillHints = const <String>[], Clip clipBehavior = Clip.hardEdge, String? restorationId, bool scribbleEnabled = true, bool enableIMEPersonalizedLearning = true}): Creates a borderless iOS-style text field.
const

Properties

autocorrect → bool: Whether to enable autocorrection.
final
autofillHints → Iterable<String>?: A list of strings that helps the autofill service identify the type of this text input.
final
autofocus → bool: Whether this text field should focus itself if nothing else is already focused.
final
clearButtonMode → OverlayVisibilityMode: Show an iOS-style clear button to clear the current text entry.
final
clipBehavior → Clip: The content will be clipped (or not) according to this option.
final
controller → TextEditingController?: Controls the text being edited.
final
cursorColor → Color?: The color to use when painting the cursor.
final
cursorHeight → double?: How tall the cursor will be.
final
cursorRadius → Radius: How rounded the corners of the cursor should be.
final
cursorWidth → double: How thick the cursor will be.
final
decoration → BoxDecoration?: Controls the BoxDecoration of the box behind the text input.
final
dragStartBehavior → DragStartBehavior: Determines the way that drag start behavior is handled.
final
enabled → bool?: Disables the text field when false.
final
enableIMEPersonalizedLearning → bool: Whether to enable that the IME update personalized data such as typing history and user dictionary data.
final
enableInteractiveSelection → bool: Whether to enable user interface affordances for changing the text selection.
final
enableSuggestions → bool: Whether to show input suggestions as the user types.
final
expands → bool: Whether this widget's height will be sized to fill its parent.
final
focusNode → FocusNode?: An optional focus node to use as the focus node for this widget.
final
hashCode → int: The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
inputFormatters → List<TextInputFormatter>?: Optional input validation and formatting overrides.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
keyboardAppearance → Brightness?: The appearance of the keyboard.
final
keyboardType → TextInputType: The type of keyboard to use for editing the text.
final
maxLength → int?: The maximum number of characters (Unicode scalar values) to allow in the text field.
final
maxLengthEnforcement → MaxLengthEnforcement?: Determines how the maxLength limit should be enforced.
final
maxLines → int?: The maximum number of lines to show at one time, wrapping if necessary.
final
minLines → int?: The minimum number of lines to occupy when the content spans fewer lines.
final
obscureText → bool: Whether to hide the text being edited (e.g., for passwords).
final
obscuringCharacter → String: Character used for obscuring text if obscureText is true.
final
onChanged → ValueChanged<String>?: Called when the user initiates a change to the TextField's value: when they have inserted or deleted text.
final
onEditingComplete → VoidCallback?: Called when the user submits editable content (e.g., user presses the "done" button on the keyboard).
final
onSubmitted → ValueChanged<String>?: Called when the user indicates that they are done editing the text in the field.
final
onTap → GestureTapCallback?: Called for each distinct tap except for every second tap of a double tap.
final
onTapOutside → TapRegionCallback?: Called for each tap that occurs outside of theTextFieldTapRegion group when the text field is focused.
final
padding → EdgeInsetsGeometry: Padding around the text entry area between the prefix and suffix or the clear button when clearButtonMode is not never.
final
placeholder → String?: A lighter colored placeholder hint that appears on the first line of the text field when the text entry is empty.
final
placeholderStyle → TextStyle?: The style to use for the placeholder text.
final
prefix → Widget?: An optional Widget to display before the text.
final
prefixMode → OverlayVisibilityMode: Controls the visibility of the prefix widget based on the state of text entry when the prefix argument is not null.
final
readOnly → bool: Whether the text can be changed.
final
restorationId → String?: Restoration ID to save and restore the state of the text field.
final
runtimeType → Type: A representation of the runtime type of the object.
read-onlyinherited
scribbleEnabled → bool: Whether iOS 14 Scribble features are enabled for this widget.
final
scrollController → ScrollController?: The ScrollController to use when vertically scrolling the input.
final
scrollPadding → EdgeInsets: Configures padding to edges surrounding a Scrollable when the Textfield scrolls into view.
final
scrollPhysics → ScrollPhysics?: The ScrollPhysics to use when vertically scrolling the input.
final
selectionControls → TextSelectionControls?: Optional delegate for building the text selection handles and toolbar.
final
selectionEnabled → bool: Same as enableInteractiveSelection.
read-only
selectionHeightStyle → BoxHeightStyle: Controls how tall the selection highlight boxes are computed to be.
final
selectionWidthStyle → BoxWidthStyle: Controls how wide the selection highlight boxes are computed to be.
final
showCursor → bool?: Whether to show cursor.
final
smartDashesType → SmartDashesType: Whether to allow the platform to automatically format dashes.
final
smartQuotesType → SmartQuotesType: Whether to allow the platform to automatically format quotes.
final
strutStyle → StrutStyle?: The strut style used for the vertical layout.
final
style → TextStyle?: The style to use for the text being edited.
final
suffix → Widget?: An optional Widget to display after the text.
final
suffixMode → OverlayVisibilityMode: Controls the visibility of the suffix widget based on the state of text entry when the suffix argument is not null.
final
textAlign → TextAlign: How the text should be aligned horizontally.
final
textAlignVertical → TextAlignVertical?: How the text should be aligned vertically.
final
textCapitalization → TextCapitalization: Configures how the platform keyboard will select an uppercase or lowercase keyboard.
final
textDirection → TextDirection?: The directionality of the text.
final
textInputAction → TextInputAction?: The type of action button to use for the keyboard.
final
toolbarOptions → ToolbarOptions: Configuration of toolbar options.
final

Methods

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<CupertinoTextField>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
override
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