Xamarin.forms: Vertical alignment of Label with FormattedString not centering

Created on 27 Oct 2018 · 5Comments · Source: xamarin/Xamarin.Forms

Description

Steps to Reproduce

This XAML produces the header as seen in shot 1. The word Brian is centered vertically and horizontally.

    <NavigationPage.TitleView>
        <StackLayout 
            Orientation="Horizontal" 
            VerticalOptions="CenterAndExpand" 
            HorizontalOptions="FillAndExpand">
            <Label 
                HorizontalTextAlignment="Center"
                VerticalOptions="Center" 
                VerticalTextAlignment="Center"
                HorizontalOptions="FillAndExpand"
                Margin="0,0,50,0"
                FontAttributes="Bold" FontSize="22" TextColor="Black" Text="Brian">
            </Label>

            <Button     
                BackgroundColor="Transparent"
                Text="&#xe147;" 
                WidthRequest="50"
                VerticalOptions="Center" 
                HorizontalOptions="End" 
                FontSize="28" 
                Clicked="Button_AddGoal">
                <Button.FontFamily>
                    <OnPlatform x:TypeArguments="x:String">
                        <On Platform="iOS">MaterialIcons-Regular</On>
                        <On Platform="Android">MaterialIcons-Regular.ttf#Material Icons</On>
                        <On Platform="UWP">Assets/MaterialIcons-Regular.ttf#Material Icons</On>
                    </OnPlatform>
                </Button.FontFamily>
            </Button>
        </StackLayout>
    </NavigationPage.TitleView>

However in this version, where I've added some FormattedString formatting, the vertical position is too low. See shot 2. The Acqua background is there to illustrate the size and position of the Label only:

    <NavigationPage.TitleView>
        <StackLayout 
            Orientation="Horizontal" 
            VerticalOptions="CenterAndExpand" 
            HorizontalOptions="FillAndExpand">
            <Label 
                BackgroundColor="Aqua"
                HorizontalTextAlignment="Center"
                VerticalOptions="Center" 
                VerticalTextAlignment="Center"
                HorizontalOptions="FillAndExpand"
                Margin="0,0,50,0">
                <Label.FormattedText>
                    <FormattedString >
                        <Span FontAttributes="Bold" FontSize="22" TextColor="Black" Text="Brian"/>
                        <Span FontAttributes="Bold" FontSize="40" TextColor="#6200EE" Text="."/>
                    </FormattedString>
                </Label.FormattedText>
            </Label>

            <Button     
                BackgroundColor="Transparent"
                Text="&#xe147;" 
                WidthRequest="50"
                VerticalOptions="Center" 
                HorizontalOptions="End" 
                FontSize="28" 
                Clicked="Button_AddGoal">
                <Button.FontFamily>
                    <OnPlatform x:TypeArguments="x:String">
                        <On Platform="iOS">MaterialIcons-Regular</On>
                        <On Platform="Android">MaterialIcons-Regular.ttf#Material Icons</On>
                        <On Platform="UWP">Assets/MaterialIcons-Regular.ttf#Material Icons</On>
                    </OnPlatform>
                </Button.FontFamily>
            </Button>
        </StackLayout>
    </NavigationPage.TitleView>

Expected Behavior

The text should be vertically centered.

Actual Behavior

The label appears to be at the end instead.

Basic Information

Version with issue:
3.4.0.925479-pre1
Last known good version:
N/A
IDE:
Visual Studio 2017 15.8.8
Android: 8.1

4 help wanted bug up-for-grabs

Source

stevehurcombe

👍4

All 5 comments

screenshot 1
screenshot 2

stevehurcombe on 27 Oct 2018

Checked against 3.4 and does appear to behave as described.

pauldipietro on 30 Oct 2018

I was just going to submit this issue... Looks like using different font sizes messes things up. There should be properties to vertically/horizontally align span text within its own region.

adrianknight89 on 5 May 2019

👍1

Just bumped into this issue.
Vertical align to start (to top) also does not work, not just center.
It only aligns to the bottom - no matter which vertical text alignment option you choose.