在flutter应用程序中添加时间选择器的正确方法是什么？

Question

在我的应用程序中，用户需要手动选择任务时间，但我不知道在flutter应用程序中使用时间选择器并由用户手动选择（一天的）时间的正确方法是什么。

Answer 1

首先在类级别声明这个变量，

TimeOfDay selectedTime = TimeOfDay.now();

然后调用这个方法：

Future<void> _selectTime(BuildContext context) async {
final TimeOfDay? pickedTime = await showTimePicker(
    context: context,
    initialTime: selectedTime, builder: (BuildContext context, Widget child) {
       return MediaQuery(
         data: MediaQuery.of(context).copyWith(alwaysUse24HourFormat: false),
        child: child,
      );});

if (pickedTime != null && pickedTime != selectedTime )
  setState(() {
    selectedTime = pickedTime;
  });
}

Answer 2

此代码将显示一个包含材料设计时间选择器的对话框。

请注意，

showTimePicker

是未来。因此，您需要使用

await

来获取时间。

TimeOfDay initialTime = TimeOfDay.now();
TimeOfDay pickedTime = await showTimePicker(
    context: context,
    initialTime: initialTime,
);

此外，您可以使用

builder

 中的 

showTimePicker

属性自定义时间选择器

TimeOfDay initialTime = TimeOfDay.now();
TimeOfDay pickedTime = await showTimePicker(
    context: context,
    initialTime: initialTime,
    builder: (BuildContext context, Widget child) {
      return Directionality(
        textDirection: TextDirection.rtl,
        child: child,
      );
    },
);

要了解更多信息，请参阅官方文档。

Answer 3

零安全

TimeOfDay selectedTime = TimeOfDay.now();

功能

  Future<void> _selectTime(BuildContext context) async {
    final TimeOfDay? picked_s = await showTimePicker(
        context: context,
        initialTime: selectedTime, builder: (BuildContext context, Widget? child) {
      return MediaQuery(
        data: MediaQuery.of(context).copyWith(alwaysUse24HourFormat: false),
        child: child!,
      );});
    if (picked_s != null && picked_s != selectedTime )
      setState(() {
        selectedTime = picked_s;
      });
  }

致电

 _selectTime(context);

Answer 4

您可以使用 flutter_datetime_picker 插件：

FlatButton(
onPressed: () {
    DatePicker.showDatePicker(context,
                          showTitleActions: true,
                          minTime: DateTime(2018, 3, 5),
                          maxTime: DateTime(2019, 6, 7), onChanged: (date) {
                        print('change $date');
                      }, onConfirm: (date) {
                        print('confirm $date');
                      }, currentTime: DateTime.now(), locale: LocaleType.zh);
},
child: Text(
    'show date time picker (Chinese)',
    style: TextStyle(color: Colors.blue),
));


 class CustomPicker extends CommonPickerModel {
   String digits(int value, int length) {
   return '$value'.padLeft(length, "0");
 }

   CustomPicker({DateTime currentTime, LocaleType locale}) : super(locale: locale) {
     this.currentTime = currentTime ?? DateTime.now();
    this.setLeftIndex(this.currentTime.hour);
   this.setMiddleIndex(this.currentTime.minute);
    this.setRightIndex(this.currentTime.second);
   }

     @override
     String leftStringAtIndex(int index) {
       if (index >= 0 && index < 24) {
       return this.digits(index, 2);
      } else {
         return null;
       }
     }

    @override
    String middleStringAtIndex(int index) {
     if (index >= 0 && index < 60) {
       return this.digits(index, 2);
      } else {
       return null;
      }
    }

   @override
   String rightStringAtIndex(int index) {
    if (index >= 0 && index < 60) {
      return this.digits(index, 2);
    } else {
      return null;
     }
   }

    @override
   String leftDivider() {
     return "|";
   }

    @override
    String rightDivider() {
      return "|";
    }

    @override
     List<int> layoutProportions() {
       return [1, 2, 1];
     }

     @override
     DateTime finalTime() {
         return currentTime.isUtc
           ? DateTime.utc(currentTime.year, currentTime.month, currentTime.day,
           this.currentLeftIndex(), this.currentMiddleIndex(), 
          this.currentRightIndex())
          : DateTime(currentTime.year, currentTime.month, currentTime.day, 
        this.currentLeftIndex(),
          this.currentMiddleIndex(), this.currentRightIndex());
             }
         }

Answer 5

您可以将其用于 flutter 中的时间选择器

Future<void> _selectTime(BuildContext context) async {
 TimeOfDay? picked = await showTimePicker(
    context: context,
    initialTime: TimeOfDay.now(), builder: (BuildContext context, Widget child) {
       return MediaQuery(
         data: MediaQuery.of(context).copyWith(alwaysUse24HourFormat: false),
        child: child,
      );});

if (picked != null && picked != TimeOfDay.now() )

}