Flutter 时间选择器

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前端小tips

修改于 2021-11-23 18:30:41

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修改于 2021-11-23 18:30:41

文章被收录于专栏：前端文章小tips前端文章小tips

准备工作

需要安装flutter的开发环境：大家可以去看看之前的教程：

1 win系统flutter开发环境安装教程: https://www.jianshu.com/p/152447bc8718

2 mac系统flutter开发环境安装教程：https://www.jianshu.com/p/bad2c35b41e3

需要用到三方库

 flutter_picker: 1.1.5
  # 弹框 https://pub.dev/packages/fluttertoast#-installing-tab-
  fluttertoast: ^7.0.4
  # 时间格式转换 https://pub.dev/packages/date_format
  date_format: 1.0.8

请在pubspec.yaml 文件中添加依赖然后在控制台输入flutter pub get 下载依赖

具体代码实现：

单例

   static void showStringPicker<T>(
        BuildContext context, {
          @required List<T> data,
          String title,
          int normalIndex,
          PickerDataAdapter adapter,
          @required _StringClickCallBack clickCallBack,
        }) {

        openModalPicker(context,
            adapter: adapter ??  PickerDataAdapter( pickerdata: data, isArray: false),
            clickCallBack:(Picker picker, List<int> selecteds){
              //          print(picker.adapter.text);
            clickCallBack(selecteds[0],data[selecteds[0]]);
           },
        selecteds: [normalIndex??0] ,
            title: title);
        }
 static void openModalPicker(
            BuildContext context, {
              @required PickerAdapter adapter,
              String title,
              List<int> selecteds,
              @required PickerConfirmCallback clickCallBack,
            }) {
          new Picker(
            adapter: adapter,
            title: new Text(title ?? "请选择",style:TextStyle(color: _kTitleColor,fontSize: _kTextFontSize)),
            selecteds: selecteds,
            cancelText: '取消',
            confirmText: '确定',
            cancelTextStyle: TextStyle(color: _kBtnColor,fontSize: _kTextFontSize),
            confirmTextStyle: TextStyle(color: _kBtnColor,fontSize: _kTextFontSize),
            textAlign: TextAlign.right,
            itemExtent: _kItemHeight,
            height: _kPickerHeight,
            selectedTextStyle: TextStyle(color: Colors.black),
            onConfirm:clickCallBack
          ).showModal(context);
        }

我们定义了一个静态方法 showStringPicker () 需要传入上下文 context 显示列表数据 @required List<T> data, 还有 String title, 以及PickerDataAdapter 适配器和回调 @required _StringClickCallBack clickCallBack,

具体外部调用

单列

JhPickerTool.showStringPicker(context,
                  data: aa,
                  normalIndex: 2,
      //          title: "请选择2",
                  clickCallBack: (int index,var str){
                   print(index);
                   print(str);
                   showText(str);
                 }
            );

多列

 JhPickerTool.showArrayPicker(context,
                    data: bb,
                    title: "请选择2",
                    normalIndex: [0,1,0],
                    clickCallBack:(var index, var strData){
                    print(index);
                    print(strData);
                    showText(strData);
                    }
                );

具体实现：

static void showDatePicker(
          BuildContext context, {
          DateType dateType,
          String title,
          DateTime maxValue,
          DateTime minValue,
          DateTime value,
          DateTimePickerAdapter adapter,
          @required _DateClickCallBack clickCallback,
          }) {

        int timeType;
        if(dateType == DateType.YM){
          timeType =  PickerDateTimeType.kYM;
        }else if(dateType == DateType.YMD_HM){
          timeType =  PickerDateTimeType.kYMDHM;
        }else if(dateType == DateType.YMD_AP_HM){
          timeType =  PickerDateTimeType.kYMD_AP_HM;
        }else{
          timeType =  PickerDateTimeType.kYMD;
        }
        openModalPicker(context,
        adapter: adapter ??
        DateTimePickerAdapter(
        type: timeType,
        isNumberMonth: true,
        yearSuffix: "年",
        monthSuffix: "月",
        daySuffix: "日",
        strAMPM: const["上午", "下午"],
        maxValue: maxValue ,
        minValue: minValue,
        value: value ?? DateTime.now(),
        ),
        title: title,
        clickCallBack:(Picker picker, List<int> selecteds){

          var time = (picker.adapter as DateTimePickerAdapter).value;
          var timeStr;
          if(dateType == DateType.YM){
            timeStr =time.year.toString()+"年"+time.month.toString()+"月";
          }else if(dateType == DateType.YMD_HM){
            timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日"+time.hour.toString()+"时"+time.minute.toString()+"分";
          }else if(dateType == DateType.YMD_AP_HM){
          var str = formatDate(time, [am])=="AM" ? "上午":"下午";
          timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日"+str+time.hour.toString()+"时"+time.minute.toString()+"分";
          }else{
            timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日";
          }
//          print(formatDate(DateTime(1989, 02, 21), [yyyy, '-', mm, '-', dd]));
             clickCallback(timeStr,picker.adapter.text);
          }
          );
   }

这边获取时间选择器通过调用showDatePicker 方法

    static void showDatePicker(
          BuildContext context, {
          DateType dateType,
          String title,
          DateTime maxValue,
          DateTime minValue,
          DateTime value,
          DateTimePickerAdapter adapter,
          @required _DateClickCallBack clickCallback,
          })

我们这边需要传入对应上下文 context 还有时间选择器类型 DateType 对应我们上图的四种样式 YM ， YMD_HM ，YMD_AP_HM kYMD 这四种还需传入最大时间和最小时间 DateTime maxValue, DateTime minValue, 这个非毕传看具体情况使用，以及我们的适配器我们根据外部传入的时间类型我们把需要用到dataType 重新赋值

int timeType;
        if(dateType == DateType.YM){
          timeType =  PickerDateTimeType.kYM;
        }else if(dateType == DateType.YMD_HM){
          timeType =  PickerDateTimeType.kYMDHM;
        }else if(dateType == DateType.YMD_AP_HM){
          timeType =  PickerDateTimeType.kYMD_AP_HM;
        }else{
          timeType =  PickerDateTimeType.kYMD;
        }

然后我们在showDatePicker 方法体里面调用 openModalPicker 我们封装好底部弹窗选择器的方法

    openModalPicker(context,
        adapter: adapter ??
        DateTimePickerAdapter(
        type: timeType,
        isNumberMonth: true,
        yearSuffix: "年",
        monthSuffix: "月",
        daySuffix: "日",
        strAMPM: const["上午", "下午"],
        maxValue: maxValue ,
        minValue: minValue,
        value: value ?? DateTime.now(),
        ),
        title: title,
        clickCallBack:(Picker picker, List<int> selecteds){

          var time = (picker.adapter as DateTimePickerAdapter).value;
          var timeStr;
          if(dateType == DateType.YM){
            timeStr =time.year.toString()+"年"+time.month.toString()+"月";
          }else if(dateType == DateType.YMD_HM){
            timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日"+time.hour.toString()+"时"+time.minute.toString()+"分";
          }else if(dateType == DateType.YMD_AP_HM){
          var str = formatDate(time, [am])=="AM" ? "上午":"下午";
          timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日"+str+time.hour.toString()+"时"+time.minute.toString()+"分";
          }else{
            timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日";
          }
//          print(formatDate(DateTime(1989, 02, 21), [yyyy, '-', mm, '-', dd]));
             clickCallback(timeStr,picker.adapter.text);
          }
          );

我们在 DateTimePickerAdapter 适配器总传入我们从外部传入的参数以及获取到当前时间 DateTime.now(), 我们在 callback 回调方法中通过picker.adapter 获取到适配器里面的属性value 拿到当前选择的时间

      var time = (picker.adapter as DateTimePickerAdapter).value;

具体转化

    clickCallBack:(Picker picker, List<int> selecteds){

          var time = (picker.adapter as DateTimePickerAdapter).value;
          var timeStr;
          if(dateType == DateType.YM){
            timeStr =time.year.toString()+"年"+time.month.toString()+"月";
          }else if(dateType == DateType.YMD_HM){
            timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日"+time.hour.toString()+"时"+time.minute.toString()+"分";
          }else if(dateType == DateType.YMD_AP_HM){
          var str = formatDate(time, [am])=="AM" ? "上午":"下午";
          timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日"+str+time.hour.toString()+"时"+time.minute.toString()+"分";
          }else{
            timeStr =time.year.toString()+"年"+time.month.toString()+"月"+time.day.toString()+"日";
          }
//          print(formatDate(DateTime(1989, 02, 21), [yyyy, '-', mm, '-', dd]));
             clickCallback(timeStr,picker.adapter.text);
          }

然后进行格式化年月日这样返回给调用页面

具体时间选择器调用

 if(str == "jhPickerTool-时间选择YM"){

            JhPickerTool.showDatePicker(
                context,
                dateType: DateType.YM,
                clickCallback: (var str,var time){
                  print(str);
                  print(time);
                  showText(str);
                }
            );
          }
          if(str == "jhPickerTool-时间选择YMD_HM"){

            JhPickerTool.showDatePicker(
                context,
                dateType: DateType.YMD_HM,
                clickCallback: (var str,var time){
                  print(str);
                  print(time);
                  showText(str);
                }
            );

          }
          if(str == "jhPickerTool-时间选择YMD_AP_HM"){

            JhPickerTool.showDatePicker(
                context,
                dateType: DateType.YMD_AP_HM,
                clickCallback: (var str,var time){
                  print(str);
                  print(time);
                  showText(str);
                }
            );
          }
          }

到此我们时间选择器和底部选择器单列多列就算讲完了

最后总结：

flutter里面提供比较好用的 flutter_picker: 1.1.5 date_format: 1.0.8 底部选择器和时间转换的库供我们调用所以底部弹窗的实现这里也要感谢作者的共享能让我们开发变得简单有兴趣的同学可以私研究用其他的方式可以实现也行我这里就不展开讲了 , 最后希望我的文章能帮助到各位解决问题，以后我还会贡献更多有用的代码分享给大家。

原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。

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