How to customize the Accordion icon color in Xamarin.Forms (SfAccordion)

You can customize the expander icon using IconColor property of SfAccordion in Xamarin.Forms.

You can also refer the following article.

https://www.syncfusion.com/kb/11443/how-to-customize-the-accordion-icon-color-in-xamarin-forms-sfaccordion

C#

Defining IconColor property in Model.

namespace AccordionXamarin
{
    public class ItemInfo : INotifyPropertyChanged
    {
        private Color _iconColor;
 
        public Color IconColor
        {
            get => _iconColor;
            set
            {
                _iconColor = value;
                OnPropertyChanged("IconColor");
            }
        }
 
        public event PropertyChangedEventHandler PropertyChanged;
 
        private void OnPropertyChanged(string Property)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(Property));
        }
    }
}

C#

Populating IconColor in ViewModel.

namespace AccordionXamarin
{
    public class ItemInfoRepository
    {
        public ObservableCollection<ItemInfo> Info { get; set; }
 
        public ItemInfoRepository()
        {
            Info = new ObservableCollection<ItemInfo>();
            Info.Add(new ItemInfo() { IconColor = Color.DarkOrange });
            Info.Add(new ItemInfo() { IconColor = Color.DarkBlue });
            Info.Add(new ItemInfo() { IconColor = Color.DarkRed });
            Info.Add(new ItemInfo() { IconColor = Color.DarkViolet });
        }
 
    }
}

XAML

Binding Accordion IconColor property with Model Property.

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:syncfusion="clr-namespace:Syncfusion.XForms.Accordion;assembly=Syncfusion.Expander.XForms"
             x:Class="AccordionXamarin.MainPage" Padding="{OnPlatform iOS='0,40,0,0'}">
 
    <ContentPage.Content>
        <syncfusion:SfAccordion x:Name="Accordion" ExpandMode="SingleOrNone" Margin="5" BindableLayout.ItemsSource="{Binding Info}">
            <BindableLayout.ItemTemplate>
                <DataTemplate>
                    <syncfusion:AccordionItem IconColor="{Binding IconColor}" x:Name="AccordionItem">
                        <syncfusion:AccordionItem.Header>
                            <Grid HeightRequest="50">
                                <Label Text="{Binding Name}" VerticalOptions="Center" HorizontalOptions="StartAndExpand"/>
                            </Grid>
                        </syncfusion:AccordionItem.Header>
                        <syncfusion:AccordionItem.Content>
                            <Grid Padding="5" BackgroundColor="NavajoWhite">
                                <Label Text="{Binding Description}"/>
                            </Grid>
                        </syncfusion:AccordionItem.Content>
                    </syncfusion:AccordionItem>
                </DataTemplate>
            </BindableLayout.ItemTemplate>
        </syncfusion:SfAccordion>
    </ContentPage.Content>
</ContentPage>

Output