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  1. Styling
  2. Style Guide

Typography

Understand how fonts and sizes are determined and utilizing in Rock Mobile.

Last updated 2 months ago

Fonts

The default font family for iOS is and the default for Android is . They are very similar in appearance, meaning you can style them identically without much visual differentiation.

Each platform has the option to specify additional weights through named font families.

Android

The following system fonts can be referenced in CSS and XAML and will not affect iOS:

  • monospace

  • serif

  • sans-serif (or sansserif)

  • sans-serif-black (or sansserif-black)

  • sans-serif-condensed (or sansserif-condensed)

  • sans-serif-condensed-light (or sansserif-condensed-light)

  • sans-serif-light (or sansserif-light)

  • sans-serif-medium (or sansserif-medium)

<Label Text="Welcome" FontFamily="sans-serif-medium" />
.font-weight-medium { font-family: sans-serif-medium; }

iOS

The following system fonts can be referenced in CSS and XAML:

  • .SFUI-Light (also affects Android)

  • .SFUI-SemiBold

  • .SFUI-Bold

  • .SFUI-Heavy

  • .SFUI-Black (also affects Android)

<Label Text="Welcome" FontFamily=".SFUI-SemiBold" />
.font-weight-semi-bold { font-family: .SFUI-SemiBold; }

Cross-Platform

Because each OS has a unique reference for similar outputs, you might consider using the OnPlatform class to set a value for each.

<!-- Option 1 - XAML -->
<Label Text="Welcome">
    <Label.FontFamily>
        <OnPlatform x:TypeArguments="x:String">
            <On Platform="iOS" Value=".SFUI-SemiBold" />
            <On Platform="Android" Value="sans-serif-medium" />
        </OnPlatform>
    </Label.FontFamily>
</Label>
<!-- Option 2 - Inline XAML -->
<Label Text="Welcome" FontFamily="{OnPlatform iOS='.SFUI-SemiBold', Android='sans-serif-medium'}" />
/* Option 3 - CSS */
.ios .font-weight-medium { font-family: .SFUI-SemiBold; }
.android .font-weight-medium { font-family: sans-serif-medium; }

Sizes

Style
Size

Title 1

28

Title 2

22

Title 3

20

Headline

17

Body

17

Callout

16

Subheadline

15

Footnote

13

Caption 1

12

Caption 2

11

<VerticalStackLayout>
    <Label Text="{{ CurrentPerson.FirstName | Escape }}" StyleClass="title2" />
    <Label Text="{{ CurrentPerson.Email | Escape }}" StyleClass="subheadline" />
</VerticalStackLayout>

Read more about with CSS.

There are numerous, pre-defined helper classes to help easily determine proven and tested font sizes in your application. These classes are based on the .

These classes are only used to determine the size of text in Rock Mobile. To learn more about setting the color of your text, take a look at our documentation.

🎨
Apple Human Interface Guidelines
colors
SF Pro Display
Roboto
Fonts in .NET MAUI - .NET MAUIMicrosoftLearn
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Customize UI appearance based on the platform and device idiom - .NET MAUIMicrosoftLearn
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