Xamarin Forms custom stepper

Question

I am trying to make a custom stepper to use in my listview such as this one

Any idea how to do this? Thanks.

Answer 1

Solution 1:

A Stepper allows inputting a discrete value that is constrained to a range. You could display the value of the Stepper using data binding in a label as follows :

Define in XAML:

<StackLayout x:Name="Container">
    <Label BindingContext="{x:Reference stepper}" Text="{Binding Value}" />
    <Stepper Minimum="0" Maximum="10" x:Name="stepper" Increment="0.5" />
</StackLayout>

Solution 2:

You could create a BindableProperty to implement this function, for example:

public class CustomStepper : StackLayout
{
    Button PlusBtn;
    Button MinusBtn;
    Entry Entry;

    public static readonly BindableProperty TextProperty =
      BindableProperty.Create(
         propertyName: "Text",
          returnType: typeof(int),
          declaringType: typeof(CustomStepper),
          defaultValue: 1,
          defaultBindingMode: BindingMode.TwoWay);

    public int Text
    {
        get { return (int)GetValue(TextProperty); }
        set { SetValue(TextProperty, value); }
    }
    public CustomStepper()
    {
        PlusBtn = new Button { Text = "+", WidthRequest = 40, FontAttributes = FontAttributes.Bold, FontSize = 15 };
        MinusBtn = new Button { Text = "-", WidthRequest = 40, FontAttributes = FontAttributes.Bold, FontSize = 15 };
        switch (Device.RuntimePlatform)
        {

            case Device.UWP:
            case Device.Android:
                {
                    PlusBtn.BackgroundColor = Color.Transparent;
                    MinusBtn.BackgroundColor = Color.Transparent;
                    break;
                }
            case Device.iOS:
                {
                    PlusBtn.BackgroundColor = Color.DarkGray;
                    MinusBtn.BackgroundColor = Color.DarkGray;
                    break;
                }
        }

        Orientation = StackOrientation.Horizontal;
        PlusBtn.Clicked += PlusBtn_Clicked;
        MinusBtn.Clicked += MinusBtn_Clicked;
        Entry = new Entry
        {
            PlaceholderColor = Color.Gray,
            Keyboard = Keyboard.Numeric,
            WidthRequest = 40, BackgroundColor = Color.FromHex("#3FFF")
        };
        Entry.SetBinding(Entry.TextProperty, new Binding(nameof(Text), BindingMode.TwoWay, source: this));
        Entry.TextChanged += Entry_TextChanged;
        Children.Add(PlusBtn);
        Children.Add(Entry);
        Children.Add(MinusBtn);
    }

    private void Entry_TextChanged(object sender, TextChangedEventArgs e)
    {
        if (!string.IsNullOrEmpty(e.NewTextValue))
            this.Text = int.Parse(e.NewTextValue);
    }

    private void MinusBtn_Clicked(object sender, EventArgs e)
    {
        if (Text > 1)
            Text--;
    }

    private void PlusBtn_Clicked(object sender, EventArgs e)
    {
        Text++;
    }

}

For more detailed information, please refer to the following documents:

• Stepper in Xamarin Forms
• Stepper Control In Xamarin.Forms Application For Android And UWP
• C# (CSharp) Xamarin.Forms.Stepper Code Examples
• Xamarin Forms Guide -- Stepper

Update:

In the CustomStepper class, the Entry value is binding with the Text property, so you could get the value of the entry via customStepper.Text.

For example:

<local:CustomStepper x:Name="MyCustomerStepper"/>

You could get its Entry value in your xaml.cs file via:

var yourCustomerStepperEntryValue = MyCustomerStepper.Text.ToString();