flutter日期选择器仅选择年、月

引入包：flutter_datetime_picker: 1.5.0
封装

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';class ATuiDateTimePicker {static Future<DateTime> showDatePicker(BuildContext context, {bool showTitleActions: true,bool isShowDay: true,DateTime minTime,DateTime maxTime,DateChangedCallback onChanged,DateChangedCallback onConfirm,DateCancelledCallback onCancel,locale: LocaleType.en,DateTime currentTime,DatePickerTheme theme,}) async {return await Navigator.push(context,_DatePickerRoute(showTitleActions: showTitleActions,onChanged: onChanged,onConfirm: onConfirm,onCancel: onCancel,locale: locale,theme: theme,isShowDay: isShowDay,barrierLabel:MaterialLocalizations.of(context).modalBarrierDismissLabel,pickerModel: DatePickerModel(currentTime: currentTime,maxTime: maxTime,minTime: minTime,locale: locale,),),);}
}class _DatePickerRoute<T> extends PopupRoute<T> {_DatePickerRoute({this.showTitleActions,this.onChanged,this.onConfirm,this.onCancel,theme,this.barrierLabel,this.locale,this.isShowDay,RouteSettings settings,pickerModel,})  : this.pickerModel = pickerModel ?? DatePickerModel(),this.theme = theme ?? DatePickerTheme(),super(settings: settings);final bool showTitleActions;final DateChangedCallback onChanged;final DateChangedCallback onConfirm;final DateCancelledCallback onCancel;final DatePickerTheme theme;final LocaleType locale;final BasePickerModel pickerModel;final bool isShowDay;@overrideDuration get transitionDuration => const Duration(milliseconds: 200);@overridebool get barrierDismissible => true;@overridefinal String barrierLabel;@overrideColor get barrierColor => Colors.black54;AnimationController _animationController;@overrideAnimationController createAnimationController() {assert(_animationController == null);_animationController =BottomSheet.createAnimationController(navigator.overlay);return _animationController;}@overrideWidget buildPage(BuildContext context, Animation<double> animation,Animation<double> secondaryAnimation) {Widget bottomSheet = MediaQuery.removePadding(context: context,removeTop: true,child: _DatePickerComponent(onChanged: onChanged,locale: this.locale,route: this,pickerModel: pickerModel,isShowDay: isShowDay,),);return InheritedTheme.captureAll(context, bottomSheet);}
}class _DatePickerComponent extends StatefulWidget {_DatePickerComponent({Key key,@required this.route,this.onChanged,this.locale,this.pickerModel,this.isShowDay}): super(key: key);final DateChangedCallback onChanged;final _DatePickerRoute route;final LocaleType locale;final BasePickerModel pickerModel;final bool isShowDay;@overrideState<StatefulWidget> createState() {return _DatePickerState();}
}class _DatePickerState extends State<_DatePickerComponent> {FixedExtentScrollController leftScrollCtrl, middleScrollCtrl, rightScrollCtrl;@overridevoid initState() {super.initState();refreshScrollOffset();}void refreshScrollOffset() {
//    print('refreshScrollOffset ${widget.pickerModel.currentRightIndex()}');leftScrollCtrl = FixedExtentScrollController(initialItem: widget.pickerModel.currentLeftIndex());middleScrollCtrl = FixedExtentScrollController(initialItem: widget.pickerModel.currentMiddleIndex());rightScrollCtrl = FixedExtentScrollController(initialItem: widget.pickerModel.currentRightIndex());}@overrideWidget build(BuildContext context) {DatePickerTheme theme = widget.route.theme;return GestureDetector(child: AnimatedBuilder(animation: widget.route.animation,builder: (BuildContext context, Widget child) {final double bottomPadding = MediaQuery.of(context).padding.bottom;return ClipRect(child: CustomSingleChildLayout(delegate: _BottomPickerLayout(widget.route.animation.value,theme,showTitleActions: widget.route.showTitleActions,bottomPadding: bottomPadding,),child: GestureDetector(child: Material(color: theme.backgroundColor ?? Colors.white,child: _renderPickerView(theme),),),),);},),);}void _notifyDateChanged() {if (widget.onChanged != null) {widget.onChanged(widget.pickerModel.finalTime());}}Widget _renderPickerView(DatePickerTheme theme) {Widget itemView = _renderItemView(theme);if (widget.route.showTitleActions) {return Column(children: <Widget>[_renderTitleActionsView(theme),itemView,],);}return itemView;}Widget _renderColumnView(ValueKey key,DatePickerTheme theme,StringAtIndexCallBack stringAtIndexCB,ScrollController scrollController,int layoutProportion,ValueChanged<int> selectedChangedWhenScrolling,ValueChanged<int> selectedChangedWhenScrollEnd,) {return Expanded(flex: layoutProportion,child: Container(padding: EdgeInsets.all(8.0),height: theme.containerHeight,decoration: BoxDecoration(color: theme.backgroundColor ?? Colors.white),child: NotificationListener(onNotification: (ScrollNotification notification) {if (notification.depth == 0 &&selectedChangedWhenScrollEnd != null &&notification is ScrollEndNotification &&notification.metrics is FixedExtentMetrics) {final FixedExtentMetrics metrics = notification.metrics;final int currentItemIndex = metrics.itemIndex;selectedChangedWhenScrollEnd(currentItemIndex);}return false;},child: CupertinoPicker.builder(key: key,backgroundColor: theme.backgroundColor ?? Colors.white,scrollController: scrollController,itemExtent: theme.itemHeight,onSelectedItemChanged: (int index) {selectedChangedWhenScrolling(index);},useMagnifier: true,itemBuilder: (BuildContext context, int index) {final content = stringAtIndexCB(index);if (content == null) {return null;}return Container(height: theme.itemHeight,alignment: Alignment.center,child: Text(content,style: theme.itemStyle,textAlign: TextAlign.start,),);},),),),);}Widget _renderItemView(DatePickerTheme theme) {return Container(color: theme.backgroundColor ?? Colors.white,child: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween,children: <Widget>[Container(child: widget.pickerModel.layoutProportions()[0] > 0? _renderColumnView(ValueKey(widget.pickerModel.currentLeftIndex()),theme,widget.pickerModel.leftStringAtIndex,leftScrollCtrl,widget.pickerModel.layoutProportions()[0], (index) {widget.pickerModel.setLeftIndex(index);}, (index) {setState(() {refreshScrollOffset();_notifyDateChanged();});}): null,),Text(widget.pickerModel.leftDivider(),style: theme.itemStyle,),Container(child: widget.pickerModel.layoutProportions()[1] > 0? _renderColumnView(ValueKey(widget.pickerModel.currentLeftIndex()),theme,widget.pickerModel.middleStringAtIndex,middleScrollCtrl,widget.pickerModel.layoutProportions()[1], (index) {widget.pickerModel.setMiddleIndex(index);}, (index) {setState(() {refreshScrollOffset();_notifyDateChanged();});}): null,),Text(widget.pickerModel.rightDivider(),style: theme.itemStyle,),widget.isShowDay ?? true? Container(child: widget.pickerModel.layoutProportions()[2] > 0? _renderColumnView(ValueKey(widget.pickerModel.currentMiddleIndex() * 100 +widget.pickerModel.currentLeftIndex()),theme,widget.pickerModel.rightStringAtIndex,rightScrollCtrl,widget.pickerModel.layoutProportions()[2], (index) {widget.pickerModel.setRightIndex(index);}, (index) {setState(() {refreshScrollOffset();_notifyDateChanged();});}): null,): Container(),],),);}// Title ViewWidget _renderTitleActionsView(DatePickerTheme theme) {final done = _localeDone();final cancel = _localeCancel();return Container(height: theme.titleHeight,decoration: BoxDecoration(color: theme.headerColor ?? theme.backgroundColor ?? Colors.white,),child: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween,children: <Widget>[Container(height: theme.titleHeight,child: CupertinoButton(pressedOpacity: 0.3,padding: EdgeInsets.only(left: 16, top: 0),child: Text('$cancel',style: theme.cancelStyle,),onPressed: () {Navigator.pop(context);if (widget.route.onCancel != null) {widget.route.onCancel();}},),),Container(height: theme.titleHeight,child: CupertinoButton(pressedOpacity: 0.3,padding: EdgeInsets.only(right: 16, top: 0),child: Text('$done',style: theme.doneStyle,),onPressed: () {Navigator.pop(context, widget.pickerModel.finalTime());if (widget.route.onConfirm != null) {widget.route.onConfirm(widget.pickerModel.finalTime());}},),),],),);}String _localeDone() {return i18nObjInLocale(widget.locale)['done'];}String _localeCancel() {return i18nObjInLocale(widget.locale)['cancel'];}
}class _BottomPickerLayout extends SingleChildLayoutDelegate {_BottomPickerLayout(this.progress,this.theme, {this.itemCount,this.showTitleActions,this.bottomPadding = 0,});final double progress;final int itemCount;final bool showTitleActions;final DatePickerTheme theme;final double bottomPadding;@overrideBoxConstraints getConstraintsForChild(BoxConstraints constraints) {double maxHeight = theme.containerHeight;if (showTitleActions) {maxHeight += theme.titleHeight;}return BoxConstraints(minWidth: constraints.maxWidth,maxWidth: constraints.maxWidth,minHeight: 0.0,maxHeight: maxHeight + bottomPadding,);}@overrideOffset getPositionForChild(Size size, Size childSize) {final height = size.height - childSize.height * progress;return Offset(0.0, height);}@overridebool shouldRelayout(_BottomPickerLayout oldDelegate) {return progress != oldDelegate.progress;}
}

引用

GestureDetector(
child: Container(width:100,height:45,color:Colors.red)
onTap: (){LocaleType localeType;await ATuiSharedPreferences.getStorage("localType").then((value) {if (value == "zh") {localeType = LocaleType.zh;} else if (value == "en") {localeType = LocaleType.en;}});ATuiDateTimePicker.showDatePicker(context,isShowDay: false,locale: localeType ?? LocaleType.zh,theme: DatePickerTheme(cancelStyle: TextStyle(fontSize: 30.sp,color: Color(0xff5dc8b6),fontWeight: FontWeight.w600),doneStyle: TextStyle(fontSize: 30.sp,color: Color(0xff5dc8b6),fontWeight: FontWeight.w600)),onConfirm: (datetime) async {String newDate = '${datetime.year}-';newDate += datetime.month < 10? '0${datetime.month}': datetime.month.toString();walletListModel.changeDate(newDate);walletListModel.changeShowDate('${datetime.year}年${datetime.month}月');walletListModel.refreshData();},onChanged: (datetime) {print('dateTime: ${datetime}');},);},
)