I am getting the following error when I try to call the expander control in Xamarin forms:
Xamarin.Forms.WeakEventManager..ctor()' is inaccessible from method Xamarin.CommunityToolkit.UI.Views.Expander..ctor()''
I have installed the Xamarin Community Toolkit nuget package and I'm referencing the namespace in my XAML file.
Control wise, I don't think I'm doing anything too crazy - does anybody know how I resolve this error?
My code is as follows:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:xct="http://xamarin.com/schemas/2020/toolkit"
xmlns:Services="clr-namespace:My_App.Services"
xmlns:ViewModel="clr-namespace:My_App.ViewModels"
x:Class="My_App.Views.MyPage"
NavigationPage.HasNavigationBar="false"
ControlTemplate="{StaticResource ContentPageTemplate}"
>
.
.
.
<xct:Expander HorizontalOptions="FillAndExpand"
Margin="{StaticResource UniversalMargin}"
BackgroundColor="Gray">
<xct:Expander.Header>
<StackLayout Orientation="Horizontal" Margin="{StaticResource UniversalMargin}">
<Label HorizontalOptions="StartAndExpand"
VerticalOptions="CenterAndExpand"
Text="{Binding Name, Converter={Services:NullToUnnamedDeviceConverter}}" FontSize="Medium" TextColor="White" />
<Label HorizontalOptions="EndAndExpand"
VerticalOptions="CenterAndExpand"
Text="{Binding BondState, Converter={Services:BondedStateToStringConverter}}" FontSize="Medium" TextColor="{StaticResource DarkBorder}" />
</StackLayout>
</xct:Expander.Header>
<xct:Expander.Content>
<Grid HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand">
<Grid.RowDefinitions>
<RowDefinition Height = "*" />
<RowDefinition Height = "*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width = "*" />
<ColumnDefinition Width = "*" />
</Grid.ColumnDefinitions>
<Label Grid.Row="0"
Grid.Column="0"
Grid.ColumnSpan="2"
Text="Info text goes here"
TextColor="White"
FontSize="Medium"/>
</Grid>
</xct:Expander.Content>
</xct:Expander>
Solution:
Update Xamarin forms from version 4.8 to 5.0 could solve this issue.
Related
I just want to put the icon on the begging of the Entry, there is not way, i had read and i can not, please i need any help
Here you have part of the code where i want to insert the ico
<ContentPage.Content>
<Grid RowSpacing="{OnPlatform iOS=25,Android=20}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<StackLayout Grid.Row="3" HorizontalOptions="Center"
WidthRequest="{OnPlatform iOS=300,Android=300}"
Orientation="Vertical">
<!-- Here where i insert the image -->
<Image Grid.Column="1" Source="userImage.png"></Image>
<Label
Text="Usuario"
FontSize="{OnPlatform Android=13}"
TextColor="Black"
/>
<Frame
HasShadow="{OnPlatform Android=true, iOS=false}"
Padding="{OnPlatform Android=6,iOS=0}"
CornerRadius="{OnPlatform Android=7}">
<Entry
Placeholder="Usuario"
ClearButtonVisibility="WhileEditing"
MaxLength="25"
FontSize="{OnPlatform Android=15,iOS=16}"
TextColor="Blue"
x:Name="txtUser">
</Entry>
</Frame>
</StackLayout>
You seem to be using Grids and StackLayouts somewhat haphazardly.
Your problem indeed comes from trying to left align an element in a vertical StackLayout. Simply having this in an horizontal StackLayout should fix your problem.
<StackLayout>
<StackLayout HorizontalOptions="Center"
WidthRequest="{OnPlatform iOS=300,Android=300}"
Orientation="Horizontal">
<Image Grid.Column="1"
Source="userImage.png"/>
<Label Text="Usuario"
FontSize="{OnPlatform Android=13}"
TextColor="Black" />
</StackLayout>
<Frame HasShadow="{OnPlatform Android=true, iOS=false}"
Padding="{OnPlatform Android=6,iOS=0}"
CornerRadius="{OnPlatform Android=7}">
<Entry Placeholder="Usuario"
ClearButtonVisibility="WhileEditing"
MaxLength="25"
FontSize="{OnPlatform Android=15,iOS=16}"
TextColor="Blue"
x:Name="txtUser" />
</Frame>
</StackLayout>
Watch out when you are defining a "Grid.Row" or a "Grid.Column" in a xaml element that is not directly "underneath" your Grid. In your example, assigning a grid column to your image element does not work since it is a child of the StackLayout and not the Grid. This will not assign the element to any of the grid's row or column since it is not a child of it. You can look into Xamarin's Grid Control documentation for more information.
I have a problem.I want to turn off a Group header in SfListView.I read on the forums to turn off IsStickyGroupHeader,I did it but IsStickyGroupHeader="False" does not work.Maybe I understand something wrong.Please help me.Thank you
<syncfusion:SfListView
x:Name="listView"
Grid.Row="0"
ItemSize="40"
IsStickyGroupHeader="False"
ItemsSource="{Binding contactsinfo}"
SelectionMode="None">
<syncfusion:SfListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<StackLayout
Grid.Column="1"
HorizontalOptions="StartAndExpand"
Orientation="Vertical"
VerticalOptions="Center">
<Label
HorizontalOptions="Center"
HorizontalTextAlignment="Center"
LineBreakMode="WordWrap"
Text="{Binding ContactName}"
TextColor="#474747"
VerticalOptions="Center"
VerticalTextAlignment="Center" />
</StackLayout>
</Grid>
<StackLayout BackgroundColor="LightGray" HeightRequest="1" />
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</syncfusion:SfListView.ItemTemplate>
</syncfusion:SfListView>
You can hide the GroupHeader by using the GroupHeaderSize as 0. Please refer to the following code snippets,
<ListView:SfListView
x:Name="listView"
Grid.Row="0"
ItemSize="40"
GroupHeaderSize="0"
ItemsSource="{Binding ContactsInfo}"
SelectionMode="None">
You can also refer to our user guidance document regarding the same,
UG link: https://help.syncfusion.com/xamarin/listview/grouping#height-customization
Also, if you are using SfListView.AutoFitMode as Height or DynamicHeight, then the items size will be calculated based on the template elements. Hence, you can customize the GroupHeaderTemplate with Height 0.
<ListView:SfListView
x:Name="listView"
Grid.Row="0"
AutoFitMode="DynamicHeight"
ItemsSource="{Binding ContactsInfo}"
SelectionMode="None">
<ListView:SfListView.GroupHeaderTemplate>
<DataTemplate>
<ViewCell Height="0"/>
</DataTemplate>
</ListView:SfListView.GroupHeaderTemplate>
Refer the following documentation regarding the same,
UG link: https://help.syncfusion.com/xamarin/listview/grouping#group-header-customization
I use the following code to create a xamarin form using visual studio for android when i look into the output lot of spaces between the controls.
Attachment contains output in emulator. Please let me know how to reduce the space between the controls:
.
Code use to create a form:
You can add the specific value for your Height in Grid.(If you do not set it, the default value of the RowDefinition.Height property is *). If you do not want to set the specific Height, please change the value of VerticalOptions from CenterAndExpand to Center(Row 1 and Row 3's Lable).
Here is code.
<ContentPage Title="Home" >
<StackLayout>
<Grid ColumnSpacing="0" RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="200"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid Grid.Row="0" >
<CarouselView x:Name="Imageslider">
<CarouselView.ItemTemplate>
<DataTemplate>
<Image Source="MonkeyFace.jpg" Aspect="AspectFill" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"></Image>
</DataTemplate>
</CarouselView.ItemTemplate>
</CarouselView>
</Grid>
<Label Grid.Row="1" HorizontalOptions="Center" VerticalOptions="Center" TextColor="Black" Text="About Us" VerticalTextAlignment="Center" FontSize="Large" />
<Label Grid.Row="2" Padding="2,0,2,0" HorizontalTextAlignment="Center" VerticalOptions="Center" HorizontalOptions="Center" Text="Surabi Institute of Hotel Management and Fashion Technology recognized by Bharathidhasan University. Surabi Institute of Hotel Management and Fashion Technology was established in the year of 2006. The aim of the Founder is to Provide Hotel Management / Fashion Technology to the poor and Need of the Society">
</Label>
<!-- Place new controls here -->
<Label Grid.Row="3" HorizontalOptions="Center" VerticalOptions="Center" TextColor="Black" Text="Saravana Educational Welfare Trust" />
</Grid>
</StackLayout>
</ContentPage>
Here is running screenshot.
I have an ImageButton which will work fine with some properties, but as soon as i add these properties to it CornerRadius , BorderColor and BorderWidth it acts weird and it scales and also goes in a weird spot of the page.
here is the full xaml code:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="Accounting.MainPage">
<StackLayout Margin="3">
<Entry
x:Name="NameEntry"
Placeholder="Enter the Fullname"
/>
<Grid Margin="3,-6,3,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button
Margin="0,0,2,0"
VerticalOptions="Center"
x:Name="AddButton"
Text="Add"
HeightRequest="50"
BackgroundColor="#03A9F4"
TextColor="White"
CornerRadius="10"
Grid.Column="0"
Clicked="AddButton_Clicked"
/>
<ImageButton
Source="add.png"
Grid.Column="1"
HorizontalOptions="Center"
VerticalOptions="Center"
WidthRequest="50"
HeightRequest="50"
CornerRadius="50"
/>
<Button
Margin="2,0,0,0"
VerticalOptions="Center"
x:Name="DeleteButton"
Text="Delete"
HeightRequest="50"
BackgroundColor="#f44336"
TextColor="White"
CornerRadius="10"
Grid.Column="2"
Clicked="DeleteButton_Clicked"
/>
</Grid>
<ListView x:Name="WorkersListView" BackgroundColor="#ECEFF1" Margin="2" ItemSelected="WorkersListView_ItemSelected">
<ListView.ItemTemplate>
<DataTemplate>
<TextCell TextColor="Black" Text="{Binding WorkerName}"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
NOTE :
The behaviors i said is for the Image that i used in the ImageButton source not the button itself , see the Picture below, and I SHOULD ALSO SAY THAT THIS PROBLEM ONLY SHOWS ON XAMARIN FORMS PREVIEWER :
Can anyone tell me the problem with it and how to fix it?
Thanks for your help in advance.
Yes, it is just the case for Xamarin Previewer, it often has problems. And we apologize for the inconvenience.
The xamarin development team is doing their best to address this issue and we are urging them to release the latest version as soon as possible.
Of course, you can also try other alternate tools ,e.g. LiveXAMLand Xamarin live reload.
For more details, you can check:
https://www.livexaml.com/
https://marketplace.visualstudio.com/items?itemName=Xamarin.XamarinLiveReload
I am trying to display a CarouselView inside a TabbedPage. I already added the (prerelease-)packages to the Project. Here is my xaml file:
<control:CarouselView x:Name="CVMain"
HeightRequest="150" >
<control:CarouselView.ItemTemplate>
<DataTemplate>
<Label HorizontalOptions="Center"
Text="Just a test :)"
VerticalOptions="Center" />
</DataTemplate>
</control:CarouselView.ItemTemplate>
</control:CarouselView>
(control: xmlns:control="clr-namespace:Xamarin.Forms;assembly=Xamarin.Forms.CarouselView")
The label doesn't show up when I launch my app. The carousel still exists tho, I can confirm that by adding the BackgroundColor="Green"attribute to the CarouselView.
What am I missing?
Edit: As suggested, I placed the Label inside a Grid, but without any success (I also added an Image):
<control:CarouselView x:Name="CVMain" HeightRequest="150">
<control:CarouselView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Image Grid.RowSpan="2"
Aspect="AspectFill"
Source="{Binding ImageBase64,
Converter={StaticResource Base64ToImageConverter}}" />
<StackLayout Grid.Row="1">
<Label Text="Test123" />
</StackLayout>
</Grid>
</DataTemplate>
</control:CarouselView.ItemTemplate>
</control:CarouselView>