how to use frames properly iOS when in xamarin forms

Hi Xamarin Forum

why does the image inside my frame goes out of the frame when I zooming in on the image when in ios device but when I look and test it on my android device frame makes the image zoomed in inside the frame it does not go out of the frame anyway here is my code im using for my xamarin forms

`<Grid ColumnSpacing="0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Frame BorderColor="Transparent">
                    <local:PinchToZoomContainer>
                        <local:PinchToZoomContainer.Content>
                            <Image Source="map" Margin="10,15,15,15" WidthRequest="300" HeightRequest="200"/>
                        </local:PinchToZoomContainer.Content>
                    </local:PinchToZoomContainer>
                </Frame>
            </Grid>`