XamarinForms:RelativeLayout里面的StackLayout没有填满整个屏幕

Question

我有这个

<RelativeLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" BackgroundColor="Red">
                <StackLayout Orientation="Vertical" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" Padding="0,15" Spacing="10"></StackLayout>
</RelativeLayout>

但由于某种原因,即使相对布局明显扩大,StackLayout也没有.如何让stacklayout水平拉伸并填充整个屏幕宽度/高度？

Answer 1

对于RelativeLayout,您需要使用约束而不是Vertical/Horizo​​ntal选项.应该是这样的

<StackLayout Orientation="Vertical" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" Padding="0,15" Spacing="10"
     RelativeLayout.WidthConstraint=
         "{ConstraintExpression Type=RelativeToParent,
                                Property=Width,
                                Factor=1}"
     RelativeLayout.HeightConstraint=
         "{ConstraintExpression Type=RelativeToParent,
                                Property=Height,
                                Factor=1}">
</StackLayout>