Xamarin.Forms 上的混合固定和可滚动元素 [英] Mixed fixed and scrollable elements on Xamarin.Forms
问题描述
我刚刚开始在 Xamarin.Forms 中编程,恐怕我需要一点帮助.我对标准 XAML 非常熟悉,但 Xamarin.Forms 有局限性和一些小小的警告.
所以问题是:我将如何在同一个视图中实现混合的固定元素和可滚动元素?就像,我希望下面的按钮固定在底部,然后是内容区域的其余部分,我希望可以滚动.
有没有办法做到这一点?
-- 更新 --
好的……
这是我的代码,顶部和底部部分渲染正确,ScrollView 区域根本没有渲染......完全空白......?
<Grid BackgroundColor="{StaticResource BackgroundGray}"><Grid.RowDefinitions><RowDefinition Height="96"/><RowDefinition Height="*"/><RowDefinition Height="自动"/><RowDefinition Height="自动"/></Grid.RowDefinitions><StackLayout Grid.Row="0" HeightRequest="96" BackgroundColor="White" VerticalOptions="Center"><Image Source="biodatix.jpg" VerticalOptions="Center" HeightRequest="48" Margin="4,8,4,4"/><Label FontFamily="Arial" FontSize="20" TextColor="{StaticResource AppLightOrange}" HorizontalTextAlignment="Center">BioDatix</Label></StackLayout><ScrollView Grid.Row="1" VerticalOptions="FillAndExpand"><Entry x:Name="Username" Placeholder="Email Address" Text="{Binding User.Email}" FontSize="Small"/><Label x:Name="reqemail" Text="请输入电子邮件地址" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="RetypeUsername" Placeholder="重新输入电子邮件地址" FontSize="Small"/><Label x:Name="reqemailverify" Text="请确认您的电子邮件地址" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry IsPassword="True" Placeholder="Password" x:Name="Password" Text="{Binding User.Password}" FontSize="Small"/><Label x:Name="reqpass" Text="请输入密码" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="FirstName" Placeholder="First Name" Text="{Binding User.FirstName}" FontSize="Small"/><Label x:Name="reqfirstname" Text="请输入您的名字" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="LastName" Placeholder="Last Name" Text="{Binding User.LastName}" FontSize="Small"/><Label x:Name="reqlastname" Text="请输入您的姓氏" IsVisible="False" FontSize="Micro" TextColor="Red"/><StackLayout Orientation="Horizontal" Margin="4"><Label x:Name="lblUseMetric" Margin="2">使用公制系统</Label><Switch x:Name="UseMetric" IsToggled="{Binding User.Metric}"></Switch></StackLayout><Entry x:Name="UserHeight" Placeholder="Height" Text="{Binding User.Height}" FontSize="Small"/><Label x:Name="reqheight" Text="请输入您的身高" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="UserWeight" Placeholder="Weight" Text="{Binding User.Weight}" FontSize="Small"/><Label x:Name="reqweight" Text="请输入您的体重" IsVisible="False" FontSize="Micro" TextColor="Red"/><StackLayout Orientation="Horizontal" Margin="4"><Label x:Name="lblWearSide" Margin="2">Wears Right</Label><Switch x:Name="WearSide" IsToggled="{绑定 User.WearSide}"></Switch></StackLayout><Label x:Name="lblError" Text="" IsVisible="False" FontSize="Default" TextColor="Red"/></ScrollView><Button x:Name="RegisterBtn" Clicked="RegisterBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="2" Text="Sign In" Margin="4"/><Button x:Name="CancelBtn" Clicked="CancelBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="3" Text="帮助登录" Margin="4"/></网格></ContentPage.Content>
是的,可以使用
Layouts
和ScrollViews
.
例如,如果你想让你的按钮固定在底部,你可以使用follow组织
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"xmlns:local="clr-namespace:Sample"x:Class="Sample.MainPage"><网格><Grid.RowDefinitions><RowDefinition Height="*"/><RowDefinition Height="自动"/></Grid.RowDefinitions><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="*"/></Grid.ColumnDefinitions><ScrollView Grid.ColumnSpan="2"><!-- 把所有内容放在这里--></ScrollView><Button Text="Cancel" Grid.Row="1" Grid.Column="0" BackgroundColor="Red"/><Button Text="Ok" Grid.Row="1" Grid.Column="1" BackgroundColor="Green"/></网格></内容页>
<块引用>
请记住,ScrollView 只能包含一个子项,因此您需要将内容包装在布局中.
对于您的具体情况:
<Grid BackgroundColor="{StaticResource BackgroundGray}"><Grid.RowDefinitions><RowDefinition Height="96"/><RowDefinition Height="*"/><RowDefinition Height="自动"/><RowDefinition Height="自动"/></Grid.RowDefinitions><StackLayout Grid.Row="0" HeightRequest="96" BackgroundColor="White" VerticalOptions="Center"><Image Source="biodatix.jpg" VerticalOptions="Center" HeightRequest="48" Margin="4,8,4,4"/><Label FontFamily="Arial" FontSize="20" TextColor="{StaticResource AppLightOrange}" HorizontalTextAlignment="Center">BioDatix</Label></StackLayout><ScrollView Grid.Row="1" VerticalOptions="FillAndExpand"><堆栈布局><Entry x:Name="Username" Placeholder="Email Address" Text="{Binding User.Email}" FontSize="Small"/><Label x:Name="reqemail" Text="请输入电子邮件地址" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="RetypeUsername" Placeholder="重新输入电子邮件地址" FontSize="Small"/><Label x:Name="reqemailverify" Text="请确认您的电子邮件地址" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry IsPassword="True" Placeholder="Password" x:Name="Password" Text="{Binding User.Password}" FontSize="Small"/><Label x:Name="reqpass" Text="请输入密码" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="FirstName" Placeholder="First Name" Text="{Binding User.FirstName}" FontSize="Small"/><Label x:Name="reqfirstname" Text="请输入您的名字" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="LastName" Placeholder="Last Name" Text="{Binding User.LastName}" FontSize="Small"/><Label x:Name="reqlastname" Text="请输入您的姓氏" IsVisible="False" FontSize="Micro" TextColor="Red"/><StackLayout Orientation="Horizontal" Margin="4"><Label x:Name="lblUseMetric" Margin="2">使用公制系统</Label><Switch x:Name="UseMetric" IsToggled="{Binding User.Metric}"></Switch></StackLayout><Entry x:Name="UserHeight" Placeholder="Height" Text="{Binding User.Height}" FontSize="Small"/><Label x:Name="reqheight" Text="请输入您的身高" IsVisible="False" FontSize="Micro" TextColor="Red"/><Entry x:Name="UserWeight" Placeholder="Weight" Text="{Binding User.Weight}" FontSize="Small"/><Label x:Name="reqweight" Text="请输入您的体重" IsVisible="False" FontSize="Micro" TextColor="Red"/><StackLayout Orientation="Horizontal" Margin="4"><Label x:Name="lblWearSide" Margin="2">Wears Right</Label><Switch x:Name="WearSide" IsToggled="{绑定 User.WearSide}"></Switch></StackLayout><Label x:Name="lblError" Text="" IsVisible="False" FontSize="Default" TextColor="Red"/></StackLayout></ScrollView><Button x:Name="RegisterBtn" Clicked="RegisterBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="2" Text="Sign In" Margin="4"/><Button x:Name="CancelBtn" Clicked="CancelBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="3" Text="帮助登录" Margin="4"/></网格></内容页>
这是结果:
I'm just getting started programming in Xamarin.Forms, and I'm afraid I might need a little hand-holding. I'm pretty handy with standard XAML, but Xamarin.Forms has limitations and coy little caveats.
So the question is: How would I implement mixed fixed and scrollable elements in the same view? Like, I want the buttons below fixed to the bottom, and then the rest of the content area, I want to be scrollable.
Is there a way to do that?
-- UPDATE --
Okay...
This is my code, and the top and bottom sections render correctly, and the ScrollView area does not render at all ... it's completely blank... ?
<ContentPage.Content>
<Grid BackgroundColor="{StaticResource BackgroundGray}">
<Grid.RowDefinitions>
<RowDefinition Height="96" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<StackLayout Grid.Row="0" HeightRequest="96" BackgroundColor="White" VerticalOptions="Center">
<Image Source="biodatix.jpg" VerticalOptions="Center" HeightRequest="48" Margin="4,8,4,4" />
<Label FontFamily="Arial" FontSize="20" TextColor="{StaticResource AppLightOrange}" HorizontalTextAlignment="Center">BioDatix</Label>
</StackLayout>
<ScrollView Grid.Row="1" VerticalOptions="FillAndExpand">
<Entry x:Name="Username" Placeholder="Email Address" Text="{Binding User.Email}" FontSize="Small" />
<Label x:Name="reqemail" Text="Please enter an email address" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="RetypeUsername" Placeholder="Retype Email Address" FontSize="Small" />
<Label x:Name="reqemailverify" Text="Please confirm your email address" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry IsPassword="True" Placeholder="Password" x:Name="Password" Text="{Binding User.Password}" FontSize="Small" />
<Label x:Name="reqpass" Text="Please enter a password" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="FirstName" Placeholder="First Name" Text="{Binding User.FirstName}" FontSize="Small" />
<Label x:Name="reqfirstname" Text="Please enter your first name" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="LastName" Placeholder="Last Name" Text="{Binding User.LastName}" FontSize="Small" />
<Label x:Name="reqlastname" Text="Please enter your last name" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<StackLayout Orientation="Horizontal" Margin="4">
<Label x:Name="lblUseMetric" Margin="2">Use Metric System</Label>
<Switch x:Name="UseMetric" IsToggled="{Binding User.Metric}"></Switch>
</StackLayout>
<Entry x:Name="UserHeight" Placeholder="Height" Text="{Binding User.Height}" FontSize="Small" />
<Label x:Name="reqheight" Text="Please enter your height" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="UserWeight" Placeholder="Weight" Text="{Binding User.Weight}" FontSize="Small" />
<Label x:Name="reqweight" Text="Please enter your weight" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<StackLayout Orientation="Horizontal" Margin="4">
<Label x:Name="lblWearSide" Margin="2">Wears Right</Label>
<Switch x:Name="WearSide" IsToggled="{Binding User.WearSide}"></Switch>
</StackLayout>
<Label x:Name="lblError" Text="" IsVisible="False" FontSize="Default" TextColor="Red"/>
</ScrollView>
<Button x:Name="RegisterBtn" Clicked="RegisterBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="2" Text="Sign In" Margin="4" />
<Button x:Name="CancelBtn" Clicked="CancelBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="3" Text="Help Signing In" Margin="4" />
</Grid>
</ContentPage.Content>
Yes, it's possible using
Layouts
andScrollViews
.
For example, if you want to keep your buttons fixed at the bottom, you can use the follow organization
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Sample"
x:Class="Sample.MainPage">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ScrollView Grid.ColumnSpan="2">
<!-- Put all the content here -->
</ScrollView>
<Button Text="Cancel" Grid.Row="1" Grid.Column="0" BackgroundColor="Red"/>
<Button Text="Ok" Grid.Row="1" Grid.Column="1" BackgroundColor="Green"/>
</Grid>
</ContentPage>
Remeber that ScrollView can only contain one children, so you need to wrap your content inside a layout.
For your specific case:
<?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="Sample.MixedPage">
<Grid BackgroundColor="{StaticResource BackgroundGray}">
<Grid.RowDefinitions>
<RowDefinition Height="96" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<StackLayout Grid.Row="0" HeightRequest="96" BackgroundColor="White" VerticalOptions="Center">
<Image Source="biodatix.jpg" VerticalOptions="Center" HeightRequest="48" Margin="4,8,4,4" />
<Label FontFamily="Arial" FontSize="20" TextColor="{StaticResource AppLightOrange}" HorizontalTextAlignment="Center">BioDatix</Label>
</StackLayout>
<ScrollView Grid.Row="1" VerticalOptions="FillAndExpand">
<StackLayout>
<Entry x:Name="Username" Placeholder="Email Address" Text="{Binding User.Email}" FontSize="Small" />
<Label x:Name="reqemail" Text="Please enter an email address" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="RetypeUsername" Placeholder="Retype Email Address" FontSize="Small" />
<Label x:Name="reqemailverify" Text="Please confirm your email address" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry IsPassword="True" Placeholder="Password" x:Name="Password" Text="{Binding User.Password}" FontSize="Small" />
<Label x:Name="reqpass" Text="Please enter a password" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="FirstName" Placeholder="First Name" Text="{Binding User.FirstName}" FontSize="Small" />
<Label x:Name="reqfirstname" Text="Please enter your first name" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="LastName" Placeholder="Last Name" Text="{Binding User.LastName}" FontSize="Small" />
<Label x:Name="reqlastname" Text="Please enter your last name" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<StackLayout Orientation="Horizontal" Margin="4">
<Label x:Name="lblUseMetric" Margin="2">Use Metric System</Label>
<Switch x:Name="UseMetric" IsToggled="{Binding User.Metric}"></Switch>
</StackLayout>
<Entry x:Name="UserHeight" Placeholder="Height" Text="{Binding User.Height}" FontSize="Small" />
<Label x:Name="reqheight" Text="Please enter your height" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<Entry x:Name="UserWeight" Placeholder="Weight" Text="{Binding User.Weight}" FontSize="Small" />
<Label x:Name="reqweight" Text="Please enter your weight" IsVisible="False" FontSize="Micro" TextColor="Red"/>
<StackLayout Orientation="Horizontal" Margin="4">
<Label x:Name="lblWearSide" Margin="2">Wears Right</Label>
<Switch x:Name="WearSide" IsToggled="{Binding User.WearSide}"></Switch>
</StackLayout>
<Label x:Name="lblError" Text="" IsVisible="False" FontSize="Default" TextColor="Red"/>
</StackLayout>
</ScrollView>
<Button x:Name="RegisterBtn" Clicked="RegisterBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="2" Text="Sign In" Margin="4" />
<Button x:Name="CancelBtn" Clicked="CancelBtn_Clicked" WidthRequest="200" HorizontalOptions="Center" BackgroundColor="{StaticResource AppGreen}" Grid.Row="3" Text="Help Signing In" Margin="4" />
</Grid>
</ContentPage>
And it's the result:
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