解决这个问题的方法是把这个逻辑从widget中提取出来,放到一个Provider中。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 final pageIndexProvider=StateProvider<int>((ref)=>0);// A provider which computes whether the user is allowed to go to the previous pagefinal canGoToPreviousPageProvider=Provid...
在学Flutter状态管理时,需要子Widget调用父Widget,报如下错误: 找了好一会,最后删除 () 后发现正常了,经过查询后得出以下结论,如下图所示: 当然上面的 final Function onChanged ,Function 也可以不用加。
在学Flutter状态管理时,需要子Widget调用父Widget,报如下错误: 找了好一会,最后删除 () 后发现正常了,经过查询后得出以下结论,如下图所示: 当然上面的final Function onChanged,Function也可以不用加。 希望对刚开始学Flutter的同学能有所帮助。
MethodResult,}from'@ohos/flutter_ohos';import{contact}from'@kit.ContactsKit';import{BusinessError}from'@kit.BasicServicesKit';/** FlutterNativeContactPickerPlugin **/exportdefaultclass FlutterNativeContactPickerPluginimplementsFlutterPlugin,MethodCallHandler{privatechannel:MethodChannel|null=null;constructor(...
widget.conversationType == 1 ? ConvType.c2c : ConvType.group; final createImageMessageRes = await TencentImSDKPlugin.v2TIMManager .getMessageManager() .createImageMessage(inputElement: inputElement); if (createImageMessageRes.code == 0) { String id = createImageMessageRes.data.id; V2TimValue...
Remove Path.combine call from CupertionoTextSelectionToolbar by @LongCatIsLooong in #134369 _DayPicker should build days using separate stetefull widget _Day. by @polina-c in #134607 LinkedText (Linkify) by @justinmc in #125927 Fix NavigationRail hover misplaced when using large icons by ...
/// [showModalBottomSheet] function. /// /// The `context` argument is used to look up the [Scaffold] for the bottom /// sheet. It is only used when the method is called. Its corresponding widget /// can be safely removed from the tree before the bottom sheet is closed. ...
void didUpdateWidget(covariant T oldWidget) { } @mustCallSuper void reassemble() { } @protected void setState(VoidCallback fn) {assert(fn != null);assert(() { if (_debugLifecycleState == _StateLifecycle.defunct) {throw FlutterError.fromParts(<DiagnosticsNode>[ ...
ElevatedButton在调用时有两个函数:tapped和widget.continued。tapped应该使按钮消失。widget.continued是来自父窗口小部件的函数,当单击时,它应该使父窗口小程序继续执行步骤2。目前,这两个函数有一个Avoid using unnecessary statements的警告,它们没有得到正确执行。当我点击continue按钮时。什么都没发生。我做错了什么?
flutter 参数类型'MaterialApp Function()'无法指派给参数类型'Widget Function(BuildContext，Widget？'嗨，...