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Xamarin Shell 跳转到二级页面后,二级页面使用RelativeLayout布局。子视图的Y值设置为和页面的Y值一样,但实际视图不是这样的。子视图距页面顶部大约 40 个空白。为什么?这个bug怎么解决?</p>

<ContentPage.Content>
        <RelativeLayout BackgroundColor="#FFFFFF">
            <BoxView x:Name="topBoxView"
                     HeightRequest="30"
                     BackgroundColor="#F0F0F0"
                     RelativeLayout.XConstraint=
                     "{ConstraintExpression Type=RelativeToParent,
                                            Property=X}"
                   RelativeLayout.YConstraint=
                     "{ConstraintExpression Type=RelativeToParent,
                                            Property=Y}"
                   RelativeLayout.WidthConstraint=
                     "{ConstraintExpression Type=RelativeToParent,
                                            Property=Width}"/>
        </RelativeLayout>
    </ContentPage.Content>>
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