iconfont

What can i do if the icon font not showing in ios? it working in windows uwp and android.
i have this code in app.xaml

<OnPlatform x:Key="FontIcons" x:TypeArguments="x:String">
            <OnPlatform.Platforms>
                <On Platform="Android" Value="UIFontIcons.ttf#UIFontIcons" />
                <On Platform="iOS" Value="UIFontIcons" />
                <On Platform="UWP" Value="Assets/UIFontIcons.ttf#UIFontIcons" />
            </OnPlatform.Platforms>
        </OnPlatform>

in the styles file for homepage.xaml i have codes like this in it for the buttons.

<Style x:Key="ActionBarSettingIconStyle" TargetType="Button">
        <Setter Property="TextColor" Value="{DynamicResource ActionBarbuttons}" />
        <Setter Property="FontFamily" Value="{StaticResource FontIcons}" />
        <Setter Property="BackgroundColor" Value="Transparent" />
        <Setter Property="Text" Value="&#xe72b;" />
        <Setter Property="FontSize" Value="20"/>
        <Setter Property="Padding" Value="{OnPlatform Default=8, UWP=6}" />
        <Setter Property="Margin" Value="4,8" />
        <Setter Property="FontAttributes" Value="Bold"/>
        <Setter Property="HeightRequest" Value="{OnPlatform Default=40, UWP=40}" />
        <Setter Property="WidthRequest" Value="{OnPlatform Default=40, UWP=40}" />
    </Style>

in homepage.xaml i have buttons like that for the buttons

x:Name="SettingsIcon"
Clicked="ShowSettings"
IsVisible="false"
Style="{StaticResource ActionBarSettingIconStyle}"
VerticalOptions="Start" />


I have the UIFontIcons.ttf in the info.plist to