Cross-platform pager with xamarin.form - xamarin

In Xamarin.Android it has a class named ViewPager to support "Gestural navigation allows the user to swipe left and right to step through pages of data." (https://learn.microsoft.com/en-us/xamarin/android/user-interface/controls/view-pager/)
But my task is write cross-platform codes for both Android & iOS (without rewrite new code for this gesture). With Xamarin.Form does any library support this ? I have read about Xamarin.Form carousel, but it seem used for slideshow, not appropriate for news list.

I think TabbedPage is more suitable for you. tabbedPage support the Gestural navigation allows the user to swipe left and right to step through pages of data, just set the different pages of data in different tabs.
Here is running GIF.
You can add this Tabbedpage like following code.
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:TabbedPageDemo;assembly=TabbedPageDemo"
x:Class="TabbedPageDemo.TabbedPageDemoPage">
<TabbedPage.Resources>
<ResourceDictionary>
<local:NonNullToBooleanConverter x:Key="booleanConverter" />
</ResourceDictionary>
</TabbedPage.Resources>
<TabbedPage.ItemTemplate>
<DataTemplate>
<ContentPage Title="{Binding Name}" Icon="monkeyicon.png">
<StackLayout Padding="5, 25">
<Label Text="{Binding Name}"
Font="Bold,Large"
HorizontalOptions="Center" />
<Image Source="{Binding PhotoUrl}"
WidthRequest="200"
HeightRequest="200" />
<StackLayout Padding="50, 10">
<StackLayout Orientation="Horizontal">
<Label Text="Family:"
HorizontalOptions="FillAndExpand" />
<Label Text="{Binding Family}"
Font="Bold,Medium" />
</StackLayout>
<StackLayout Orientation="Horizontal"
IsVisible="{Binding Subfamily,
Converter={StaticResource booleanConverter}}">
<Label Text="Subfamily:"
HorizontalOptions="FillAndExpand" />
<Label Text="{Binding Subfamily}"
Font="Bold,Medium" />
</StackLayout>
<StackLayout Orientation="Horizontal"
IsVisible="{Binding Tribe,
Converter={StaticResource booleanConverter}}">
<Label Text="Tribe:"
HorizontalOptions="FillAndExpand" />
<Label Text="{Binding Tribe}"
Font="Bold,Medium" />
</StackLayout>
<StackLayout Orientation="Horizontal">
<Label Text="Genus:"
HorizontalOptions="FillAndExpand" />
<Label Text="{Binding Genus}"
Font="Bold,Medium" />
</StackLayout>
</StackLayout>
</StackLayout>
</ContentPage>
</DataTemplate>
</TabbedPage.ItemTemplate>
</TabbedPage>
You can add different ItemTemplate in the Tabbedpage.
Here is a related link.
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/navigation/tabbed-page
Update: you can add the listview in the tabbpage like following GIF.

Related

How to use a ListView in Xamarin Forms and keep it from growing to big

I need to display a list with about 30 to 40 items that the user has to choose from, and I don't wont to use a combobox, so a Listview seems the way to go.
However, once I put a listview on the page, the listview grows so much in height that it goes off the screen, how can I prevent that ?
I need something like this
<gttCompound:PageBase xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:gttCompound="clr-namespace:gttCompound.Pages"
x:Class="gttCompound.Pages.PageDamageSelectFromList">
<gttCompound:PageBase.ChildStackLayoutContent>
<StackLayout Orientation="Vertical" VerticalOptions="FillAndExpand" Margin="5, 5">
<StackLayout VerticalOptions="Start" Orientation="Horizontal" HorizontalOptions="Center">
<Label Text="SELECT THE DAMAGE LOCATION" FontAttributes="Bold" FontSize="{StaticResource FontSizeLabelSmall}" TextColor="{StaticResource TextColor}" ></Label>
</StackLayout>
<StackLayout x:Name="entirePage" BackgroundColor="Yellow">
<ListView x:Name="listView" ItemsSource="{Binding Items}" Margin="0" BackgroundColor="Red">
<!-- ListView Stuff -->
</ListView>
</StackLayout>
<StackLayout HorizontalOptions="FillAndExpand" Orientation="Horizontal" VerticalOptions="EndAndExpand">
<Button x:Name="ButtonDamageBack" WidthRequest="150" FontAttributes="Bold" HorizontalOptions="Start" TextTransform="Uppercase" Text="{Binding Back}" BackgroundColor="{StaticResource ElementBackgroundColor}" TextColor="{StaticResource ElementTextColor}" FontSize="{StaticResource FontSizeButtonLittle}" />
<Button x:Name="ButtonDamageNext" WidthRequest="150" FontAttributes="Bold" HorizontalOptions="EndAndExpand" TextTransform="Uppercase" IsEnabled="False" Text="{Binding Next}" BackgroundColor="{StaticResource ElementDisabledBackgroundColor}" TextColor="{StaticResource ElementTextColor}" FontSize="{StaticResource FontSizeButtonLittle}" />
</StackLayout>
</StackLayout>
</gttCompound:PageBase.ChildStackLayoutContent>
I gave some elements a noticable background color so I can see how much space they take
The listview takes way to much space.
Might it be because the page is an inherited page ?
The base page looks like this
<?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="gttCompound.Pages.PageBase"
xmlns:helpers="clr-namespace:gttCompound.Pages.Helpers">
<ContentPage.Resources>
<ResourceDictionary>
<helpers:StringNewLineConverter x:Key="StringNewLineConverter"/>
<helpers:StringToTitleCaseConverter x:Key="StringToTitleCaseConverter"/>
<helpers:StringSubstringConverter x:Key="StringSubstringConverter"/>
</ResourceDictionary>
</ContentPage.Resources>
<!-- All the stuff about the AbsoluteLayout is to get a WaitCursor that can show in the center of the screen, see this url
https://stackoverflow.com/questions/48295792/xamarin-forms-how-to-fix-activity-indicator-in-centre-of-screen-in-scrollview
-->
<AbsoluteLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<ScrollView AbsoluteLayout.LayoutBounds="0,0,1,1" AbsoluteLayout.LayoutFlags="All" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<StackLayout>
<StackLayout x:Name="TopStackLayout" VerticalOptions="Start" BackgroundColor="{StaticResource HeaderColor}" Orientation="Horizontal">
<Frame VerticalOptions="Center" Padding="0" BackgroundColor="{StaticResource HeaderColor}" BorderColor="Transparent" WidthRequest="40">
<Button x:Name="ButtonBack" VerticalOptions="Start" Text="" Image="Back.png" BackgroundColor="{StaticResource HeaderColor}" TextColor="{StaticResource TextColor}" FontSize="8" HeightRequest="14" />
</Frame>
<Frame VerticalOptions="CenterAndExpand" Padding="0" BackgroundColor="{StaticResource HeaderColor}" BorderColor="Transparent">
<Label Text="{Binding AppName}" HorizontalOptions="Start" HorizontalTextAlignment="Center" TextColor="White" FontSize="{StaticResource FontSizeLabelBig}" Padding="0" x:Name="Page_Title" />
</Frame>
</StackLayout>
<StackLayout x:Name="ChildStackLayout" VerticalOptions="FillAndExpand" Orientation="Vertical" Margin="0,-6">
</StackLayout>
<StackLayout x:Name="BottomStackLayout" VerticalOptions="End" Orientation="Horizontal" BackgroundColor="{StaticResource HeaderColor}">
<Label x:Name="LabelUser" Text="" TextColor="White" FontSize="{StaticResource FontSizeLabelTiny}" BackgroundColor="{StaticResource HeaderColor}" Margin="0,0,0,-6" HorizontalTextAlignment="Start" IsVisible= "True" />
<Label x:Name="LabelVersion" Text="" HorizontalOptions="CenterAndExpand" TextColor="White" FontSize="{StaticResource FontSizeLabelTiny}" BackgroundColor="{StaticResource HeaderColor}" Margin="0,0,0,-6" HorizontalTextAlignment="Center" IsVisible= "True" />
<Label Text="{Binding CopyRight}" HorizontalOptions="EndAndExpand" BackgroundColor="{StaticResource HeaderColor}" HorizontalTextAlignment="End" TextColor="White" FontSize="{StaticResource FontSizeLabelTiny}" />
</StackLayout>
</StackLayout>
</ScrollView>
<AbsoluteLayout x:Name="LayoutWaitCursor" BackgroundColor="#22000000" AbsoluteLayout.LayoutBounds="0.5,0.5,1,1" AbsoluteLayout.LayoutFlags="All" IsVisible="false">
<ActivityIndicator IsVisible="true" IsRunning="True" Color="{StaticResource TextColor}" AbsoluteLayout.LayoutBounds="0.5,0.5,0.1,0.1" AbsoluteLayout.LayoutFlags="All" />
</AbsoluteLayout>
</AbsoluteLayout>
</ContentPage>
Here is how the form looks like at runtime
And without the listview it looks like this
I changed just this
<StackLayout x:Name="entirePage" BackgroundColor="Yellow">
<!--
<ListView x:Name="listView" ItemsSource="{Binding Items}" Margin="0" BackgroundColor="Red">
</ListView>
-->
</StackLayout>
What I want is that the listview is visible and scrollable, but the 2 buttons should always stay visible. The listview must only occupy the space between the label on top of the page and the 2 buttons on the bottom of the page.
How can I do that ?
1) REMOVE ScrollView.
2) <StackLayout x:Name="ChildStackLayout" VerticalOptions="FillAndExpand" .... Try different VerticalOptions. Try Center. Also try CenterAndExpand..
3) If still wrong, change the outer StackLayout to Grid, and use RowDefinitions="Auto,*,Auto", with the 3 sections marked Grid.Row="0" / "1" / "2".
ChildStackLayout is "1" (numbered from 0), so gets the * in RowDefinitions.

Display title, text content in an xaml in rectangle shape

I want to display title, text content ( approx 300 characters) from database in an Updates.xaml page. The title, text content should display in a rectangle blocks. When ever user submit a new update the latest one should automatically display on top of the page and each should be properly spaced between one another.
<?xml version="1.0" encoding="utf-8" ?>
<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"
x:Class="soccerapp.UpdatesNews" BackgroundColor="#aa49e3" Title="Updates"
mc:Ignorable="d">
<StackLayout>
<!-- Place new controls here -->
<Button x:Name="plusButton"
Text="+"
WidthRequest="60"
HeightRequest="60"
CornerRadius ="30"
VerticalOptions="Start"
HorizontalOptions="EndAndExpand"
Clicked="OnPlusButtonClicked" />
<Label
HorizontalOptions="Center"
Text="News!"
VerticalOptions="CenterAndExpand" />
<ListView x:Name="LstTest" ItemTapped="LstTest_ItemTapped">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Label Text="{Binding .}" />
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage>
<ViewCell>
<Frame>
<StackLayout>
<Label Text="{Binding Title}" />
<Label Text="{Binding Text}" />
<Label Text="{Binding Content}" />
</StackLayout>
</Frame>
</ViewCell>

How can get text from XfxEntry?

I have used Xamrin with vs 2017 professional.
I want to use a floating text view in the cross-platform application.
I have used below link but it not describe how can get a text from it.
[link] https://github.com/XamFormsExtended/Xfx.Controls
Main.xaml
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:xfx="clr-namespace:Xfx;assembly=Xfx.Controls"
x:Class="Reports_Rpt.Signup">
<NavigationPage.TitleView>
<StackLayout Orientation="Horizontal" VerticalOptions="Center" Spacing="10" BackgroundColor="#4B8CA8">
<Image Source="iconXamagon.png">
</Image>
</StackLayout>
</NavigationPage.TitleView>
<ContentPage.Content>
<StackLayout Padding="2,2,2,2" BackgroundColor="White">
<StackLayout Orientation="Horizontal" VerticalOptions="Start" HorizontalOptions="FillAndExpand">
<xfx:XfxEntry
Placeholder="Enter your name"
Text="{Binding Name}"
ErrorText="{Binding NameErrorText}" />
</StackLayout>
</StackLayout>
</ContentPage.Content>
</ContentPage>
You have bound the Text property to Name, so the Name property of your model should contain the text.
Alternatively, you can assign a name to the control and reference it that way
<xfx:XfxEntry x:Name="myEntry" Placeholder="Enter your name"
Text="{Binding Name}"
ErrorText="{Binding NameErrorText}" />
then in your code-behind
var value = myEntry.Text;

Transparency not rendering the same on xamarin.ios project

I just can't understand why the background for my side menu on xamarin forms won't render the same on my xamarin.ios. Yet in other parts of the project my list views render and look the same when I use transparent backgrounds, I even tried copying and pasting the xaml code from other parts of the project where it does render the same, but still it does not work. In case anyone's wondering the side menu on ios was requested by the client.
Attached below I have 2 images showing how the side menu renders differently on the 2 platforms
Here's the Xaml code I'm using for my Side Menu:
<MasterDetailPage.Master>
<StackLayout Orientation="Vertical" BackgroundColor="Transparent" Spacing="0">
<StackLayout
HorizontalOptions="Fill"
Orientation="Horizontal"
VerticalOptions="Fill" BackgroundColor="Black" Padding="50, 50, 50, 50">
<StackLayout HorizontalOptions="Center" Orientation="Vertical">
<ffimageloading:CachedImage x:Name="ProfilePictureCircleImage"
LoadingPlaceholder="profile_image_placeholder.png"
ErrorPlaceholder="profile_image_placeholder.png"
DownsampleToViewSize="true"
FadeAnimationEnabled="true"
HeightRequest="65"
WidthRequest="65">
<ffimageloading:CachedImage.Transformations>
<fftransformations:CircleTransformation/>
</ffimageloading:CachedImage.Transformations>
</ffimageloading:CachedImage>
</StackLayout>
<StackLayout
HorizontalOptions="CenterAndExpand"
Orientation="Vertical"
VerticalOptions="CenterAndExpand">
<Label
x:Name="FullNameLabel"
FontSize="18"
HorizontalOptions="Center"
TextColor="White"
VerticalOptions="CenterAndExpand" />
</StackLayout>
</StackLayout>
<BoxView HeightRequest="2" BackgroundColor="#D90B31"/>
<ListView
x:Name="NavigationMenuItems"
ItemSelected="OnMenuItemSelected"
BackgroundColor="{StaticResource TileColour}"
RowHeight="60"
SeparatorVisibility="None"
SeparatorColor="Transparent">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<!-- Main design for menu items -->
<StackLayout
Padding="20,10,0,10"
Orientation="Horizontal"
Spacing="20"
VerticalOptions="FillAndExpand"
BackgroundColor="Transparent">
<local:TintedCachedImage TintColor="{StaticResource SideMenuIconColor}"
Source="{Binding Icon}"
VerticalOptions="Center"
DownsampleToViewSize="true"
HeightRequest="19"
WidthRequest="19"/>
<Label
FontSize="15"
Text="{Binding Title}"
TextColor="{StaticResource SideMenuTextColor}"
VerticalOptions="Center" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage />
</MasterDetailPage.Detail>
above are pictures illustrating how it looks across the 2 platforms.
Found the solution to this question on another stackoverflow thread I had to use a custom renderer:
public class CustomSideMenuRenderer: TabletMasterDetailRenderer
{
public override void ViewWillLayoutSubviews()
{
base.ViewWillLayoutSubviews();
var master = ViewControllers[0];
master.View.BackgroundColor = UIColor.Clear;
var detail = ViewController.ChildViewControllers[1];
}
}

Xamarin More ListViews in ScrollView not resizing [duplicate]

<?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="Dh.ListPage">
<ContentPage.Content>
<ScrollView>
<StackLayout Style="{StaticResource MainStackLayoutWhenLoggedInStyle}">
<Frame Style="{StaticResource FrameStyle2}">
<StackLayout>
<Label Text="Vragenlijsten" Style="{StaticResource TitelLabelStyle}" />
</StackLayout>
</Frame>
<Frame Style="{StaticResource FrameStyle2}">
<StackLayout>
<Label Text="DRINGENDE VRAGEN: vul deze vragen meteen in!" Style="{StaticResource StandardLabelStyle}"/>
<Frame Style="{StaticResource FrameStyle2}">
<StackLayout Style="{StaticResource ListViewStackLayoutStyle}" >
<ListView ItemTapped="OnItemTapped" ItemsSource="{Binding Question_Lists}" Style="{StaticResource StandardListViewStyle}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<Label Text="{Binding Title}" Style="{StaticResource StandardLabelStyle}" />
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</Frame>
</StackLayout>
</Frame>
</StackLayout>
</ScrollView>
</ContentPage.Content>
When my screen is too small then my listview does not want to scroll. If my screen is not too small then listview does scroll. Can someone help me pls?
Never stack a ListView inside a ScrollView as both implement scrolling on Android at least.
Xamarin.Forms.ScrollView Class documentation says:
Application developers should not nest one ScrollView within another. Additionally, they should refrain from nesting them other elements that can scroll, such as WebView.
ListView.ScrollTo Method Scrolls the ListView to the item.
Put your StackLayout in ListView.Header or ListView.Footer
<ListView ItemsSource="{Binding Comments}">
<ListView.Header>
<StackLayout Padding="30,30,30,0">
<Label Text="Article" />
</StackLayout>
</ListView.Header>
<ListView.Footer>
<StackLayout HeightRequest="85" />
</ListView.Footer>
</ListView>

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