我正在设置一个跨平台的应用程序。如何使输入字符串的格式正确
这是一个 Xamarim.forms 项目
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="TestProjectXamarin.Views.DetailViews.InfoScren1">
<ContentPage.Content>
<StackLayout x:Name="MainLayout">
<RelativeLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<StackLayout x:Name="SubLayout"
Orientation="Vertical"
VerticalOptions="FillAndExpand"
RelativeLayout.XConstraint="{ConstraintExpression Type=Constant, Constant=e}"
RelativeLayout.YConstraint="{ConstraintExpression Type=Constant, Constant=e}">
<Label Text="Let's see the bla bla bla Over Here" HorizontalOptions="Center" VerticalOptions="Center"/>
</StackLayout>
<ActivityIndicator IsRunning="True" Color="Gray" x:Name="ActivitySpinner"
VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand"
RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent, Property=width, Factor=0.45}"
RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.45}"/>
</RelativeLayout>
</StackLayout>
</ContentPage.Content>
我希望代码没有错误,但它告诉我输入字符串的格式不正确
您得到的错误是因为您正在分配Constant=e
,而 Constant 必须获得一个值。
常量 – 用作值偏移量的值。
此外,在您的 ActivityIndicator 中,该属性是Width
.
这是您的示例工作。根据您的需要调整常量值。
<StackLayout x:Name="MainLayout">
<RelativeLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<StackLayout x:Name="SubLayout"
Orientation="Vertical"
VerticalOptions="FillAndExpand"
RelativeLayout.XConstraint="{ConstraintExpression Type=Constant, Constant=1}"
RelativeLayout.YConstraint="{ConstraintExpression Type=Constant, Constant=1}">
<Label Text="Let's see the bla bla bla Over Here" HorizontalOptions="Center" VerticalOptions="Center"/>
</StackLayout>
<ActivityIndicator IsRunning="True" Color="Gray" x:Name="ActivitySpinner"
VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand"
RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor=0.45}"
RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.45}"/>
</RelativeLayout>
</StackLayout>
有关 RelativeLayouts 的更多信息,请查看文档
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