Szerkesztés

Megosztás a következőn keresztül:

Time picker

  • Cikk

The time picker gives you a standardized way to let users pick a time value using touch, mouse, or keyboard input.

Example of time picker

Is this the right control?

Use a time picker to let a user pick a single time value.

For more info about choosing the right control, see the Date and time controls article.

Examples

The entry point displays the chosen time, and when the user selects the entry point, a picker surface expands vertically from the middle for the user to make a selection. The time picker overlays other UI; it doesn't push other UI out of the way.

Example of the time picker expanding

UWP and WinUI 2

Important

The information and examples in this article are optimized for apps that use the Windows App SDK and WinUI 3, but are generally applicable to UWP apps that use WinUI 2. See the UWP API reference for platform specific information and examples.

This section contains information you need to use the control in a UWP or WinUI 2 app.

APIs for this control exist in the Windows.UI.Xaml.Controls namespace.

We recommend using the latest WinUI 2 to get the most current styles and templates for all controls. WinUI 2.2 or later includes a new template for this control that uses rounded corners. For more info, see Corner radius.

Create a time picker

Open the WinUI 3 Gallery app and see the TimePicker in action.

The WinUI 3 Gallery app includes interactive examples of most WinUI 3 controls, features, and functionality. Get the app from the Microsoft Store or get the source code on GitHub

This example shows how to create a simple time picker with a header.

<TimePicker x:Name="arrivalTimePicker" Header="Arrival time"/>

TimePicker arrivalTimePicker = new TimePicker();
arrivalTimePicker.Header = "Arrival time";

The resulting time picker looks like this:

Example of time picker

Formatting the time picker

By default, the time picker shows a 12-hour clock with an AM/PM selector. You can set the ClockIdentifier property to "24HourClock" to show a 24-hour clock instead.

<TimePicker Header="24HourClock" SelectedTime="18:21" ClockIdentifier="24HourClock"/>

A time picker 24 hour clock.

You can set the MinuteIncrement property to indicate the time increments shown in the minute picker. For example, 15 specifies that the TimePicker minute control displays only the choices 00, 15, 30, 45.

<TimePicker MinuteIncrement="15"/>

A time picker showing 15 minute increments.

Time values

The time picker control has both Time/TimeChanged and SelectedTime/SelectedTimeChanged APIs. The difference between these is that Time is not nullable, while SelectedTime is nullable.

The value of SelectedTime is used to populate the time picker and is null by default. If SelectedTime is null, the Time property is set to a TimeSpan of 0; otherwise, the Time value is synchronized with the SelectedTime value. When SelectedTime is null, the picker is 'unset' and shows the field names instead of a time.

A time picker with no time selected.

Initializing a time value

In code, you can initialize the time properties to a value of type TimeSpan:

TimePicker timePicker = new TimePicker
{
    SelectedTime = new TimeSpan(14, 15, 00) // Seconds are ignored.
};

You can set the time value as an attribute in XAML. This is probably easiest if you're already declaring the TimePicker object in XAML and aren't using bindings for the time value. Use a string in the form Hh:Mm where Hh is hours and can be between 0 and 23 and Mm is minutes and can be between 0 and 59.

<TimePicker SelectedTime="14:15"/>

Note

For important info about date and time values, see DateTime and Calendar values in the Date and time controls article.

Using the time values

To use the time value in your app, you typically use a data binding to the SelectedTime or Time property, use the time properties directly in your code, or handle the SelectedTimeChanged or TimeChanged event.

For an example of using a DatePicker and TimePicker together to update a single DateTime value, see Calendar, date, and time controls - Use a date picker and time picker together.

Here, the SelectedTime property is used to compare the selected time to the current time.

Notice that because the SelectedTime property is nullable, you have to explicitly cast it to DateTime, like this: DateTime myTime = (DateTime)(DateTime.Today + checkTimePicker.SelectedTime);. The Time property, however, could be used without a cast, like this: DateTime myTime = DateTime.Today + checkTimePicker.Time;.

A time picker, button, and text label. 

<StackPanel>
    <TimePicker x:Name="checkTimePicker"/>
    <Button Content="Check time" Click="{x:Bind CheckTime}"/>
    <TextBlock x:Name="resultText"/>
</StackPanel>

private void CheckTime()
{
    // Using the Time property.
    // DateTime myTime = DateTime.Today + checkTimePicker.Time;
    // Using the SelectedTime property (nullable requires cast to DateTime).
    DateTime myTime = (DateTime)(DateTime.Today + checkTimePicker.SelectedTime);
    if (DateTime.Now >= myTime)
    {
        resultText.Text = "Your selected time has already past.";
    }
    else
    {
        string hrs = (myTime - DateTime.Now).Hours.ToString();
        string mins = (myTime - DateTime.Now).Minutes.ToString();
        resultText.Text = string.Format("Your selected time is {0} hours, {1} minutes from now.", hrs, mins);
    }
}

Get the sample code