I'm devolpin an app with Xamarin.Forms for iOS and Android and I have a page that I want show ToolbarItem only for iOS app. In Android, I want use a button inside of page. How can I do that? I made it adding a ToolbarItem with blank text in Android, but I believe that is not the right way to do that.
Here is my page xaml code:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="VFood.Views.Garcons">
<ContentPage.Content>
<StackLayout>
<Label Text="Garçons"
VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand" />
</StackLayout>
</ContentPage.Content>
<ContentPage.ToolbarItems>
<OnPlatform x:TypeArguments="ToolbarItem">
<OnPlatform.iOS>
<ToolbarItem Text="Adicionar"/>
</OnPlatform.iOS>
<OnPlatform.Android>
<ToolbarItem Text=""/>
</OnPlatform.Android>
</OnPlatform>
</ContentPage.ToolbarItems>
don't specify anything for the platform you DON'T want to have it
<ContentPage.ToolbarItems>
<OnPlatform x:TypeArguments="ToolbarItem">
<OnPlatform.iOS>
<ToolbarItem Text="Adicionar"/>
</OnPlatform.iOS>
</OnPlatform>
</ContentPage.ToolbarItems>
I too got null reference exception doing that in XAML, what worked for me however is doing that in code-behind:
public partial class Garcons
{
public Garcons()
{
InitializeComponent();
if (Device.RuntimePlatform == Device.iOS)
{
var myToolbarItem = new ToolbarItem()
{
Icon = "myIcon.png",
Order = ToolbarItemOrder.Primary,
Priority = 0,
Text = "MyToolbarItem"
};
myToolbarItem.SetBinding(MenuItem.CommandProperty, "MyToolbarItemCommand");
ToolbarItems.Insert(0, myToolbarItem);
}
}
}
The above code is equivalent of this XAML version:
<ToolbarItem Icon="myIcon.png" Order="Primary" Priority="0"
Text="MyToolbarItem" Command="{Binding MyToolbarItemCommand}"/>
Related
I have a question. I created the following TabbedPage:
<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage 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"
xmlns:views="clr-namespace:MyApp.Views"
mc:Ignorable="d"
x:Class="MyApp.Views.MainPage"
xmlns:android="clr-namespace:Xamarin.Forms.PlatformConfiguration.AndroidSpecific;assembly=Xamarin.Forms.Core"
android:TabbedPage.ToolbarPlacement="Bottom"
BarBackgroundColor="White"
BarTextColor="Black"
android:TabbedPage.BarItemColor="#B2B2B2"
android:TabbedPage.BarSelectedItemColor="#56D7A5"
android:TabbedPage.IsSwipePagingEnabled="False">
<TabbedPage.Children>
<NavigationPage Title="page1" IconImageSource="navbar_page1">
<x:Arguments>
<views:page1 NavigationPage.HasNavigationBar="False" />
</x:Arguments>
</NavigationPage>
<NavigationPage Title="page2" IconImageSource="navbar_page2">
<x:Arguments>
<views:page2 NavigationPage.HasNavigationBar="False" />
</x:Arguments>
</NavigationPage>
<NavigationPage Title="page3" IconImageSource="navbar_page3">
<x:Arguments>
<views:page3 NavigationPage.HasNavigationBar="False" />
</x:Arguments>
</NavigationPage>
</TabbedPage>
Now on every page I have added this custom FabMenu like this:
<c:FloatingMenu Margin="0, 0, 10, 10" BGColor="#56D7A5" OpenIcon="openFab_icon" CloseIcon="closeFab_icon"
AbsoluteLayout.LayoutBounds=".95,.95" AbsoluteLayout.LayoutFlags="PositionProportional">
<c:FloatingButton x:Name="btnAddHomework" BGColor="#59E1FF" IconSrc="add_homework_icon" OnClickCommand="{Binding btnAddHomeworkCommand}" />
<c:FloatingButton x:Name="btnAddDeadline" BGColor="#0FF1A0" IconSrc="add_deadline_icon"/>
<c:FloatingButton x:Name="btnAddTest" BGColor="#5988FF" IconSrc="add_test_icon"/>
</c:FloatingMenu>
The problem is that every page has his own FabMenu, so you see it dissapear and reappear on every page, so my question is: Is there some kind of root view that overlays all the tabs in the TabbedPage?
Please let me know how I do that!
Disclaimer
I came up with a way to create the effect wanted using only pure Xamarin.Forms. Read along and pay attention to the tricky parts of the solution.
Abstract
This solution is achieved implementing AbsoluteLayout, CarouselView, IndicatorView and DataTemplateSelector. Xamarin.Forms 4.8 is supposed in what follows. If a lower version is used, please take into account that features like CarouselView or IndicatorView could be in Preview status.
DataTemplateSelector, CarouselView and IndicatorView are used to simulate a TabbedPage, and AbsoluteLayout is used to provide the Overlay.
So, now with the solution:
Create your Views
Here you create a view for each of the pages you want. In this example i want my application to consist of two pages, so i create two views (code behind remains untouched):
View1.xaml
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="overlayTest.View1"
BackgroundColor="Black">
<ContentView.Content>
<StackLayout>
<Label Text="Welcome to Xamarin.Forms 1!"
TextColor="White"
VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand" />
</StackLayout>
</ContentView.Content>
</ContentView>
View2.xaml
<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="overlayTest.View2">
<ContentView.Content>
<StackLayout>
<Label Text="Welcome to Xamarin.Forms 2!"
VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand" />
</StackLayout>
</ContentView.Content>
</ContentView>
Create a DataTemplateSelector
This will be used by the CarouselView in order to select one view or the other depending on the current Position.
using System;
using Xamarin.Forms;
namespace overlayTest
{
class MyTemplateSelector : DataTemplateSelector
{
readonly DataTemplate view1, view2;
public MyTemplateSelector()
{
view1 = new DataTemplate(typeof(View1));
view2 = new DataTemplate(typeof(View2));
}
protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
{
String s = item.ToString();
if(s == "1")
{
return view1;
}
return view2;
}
}
}
Create your Main Page
Page1.xaml
<?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:t="clr-namespace:overlayTest"
x:Class="overlayTest.Page1">
<ContentPage.Resources>
<ResourceDictionary>
<t:MyTemplateSelector x:Key="templateSelector"/>
</ResourceDictionary>
</ContentPage.Resources>
<ContentPage.Content>
<AbsoluteLayout>
<StackLayout AbsoluteLayout.LayoutBounds="0,0,1,1"
AbsoluteLayout.LayoutFlags="All"
Padding="0"
Spacing="0">
<CarouselView ItemTemplate="{StaticResource templateSelector}"
IndicatorView="indicatorView">
<CarouselView.ItemsSource>
<x:Array Type="{x:Type x:String}">
<x:String>1</x:String>
<x:String>2</x:String>
</x:Array>
</CarouselView.ItemsSource>
</CarouselView>
<IndicatorView x:Name="indicatorView">
<IndicatorView.IndicatorTemplate>
<DataTemplate>
<StackLayout HorizontalOptions="FillAndExpand">
<Frame Margin="10">
<Label/>
</Frame>
</StackLayout>
</DataTemplate>
</IndicatorView.IndicatorTemplate>
</IndicatorView>
</StackLayout>
<ContentView
IsVisible="True" VerticalOptions="Start"
AbsoluteLayout.LayoutBounds="0,0,1,1"
AbsoluteLayout.LayoutFlags="All"
BackgroundColor="Transparent">
<Frame CornerRadius="10"
Margin="20"
VerticalOptions="StartAndExpand"
HorizontalOptions="CenterAndExpand" InputTransparent="False">
<StackLayout Padding="0">
<Label
FontSize="Medium"
TextColor="Black"/>
<StackLayout Orientation="Horizontal"
HorizontalOptions="CenterAndExpand">
<Label Text="I am floating here"/>
<Switch IsToggled="True" />
</StackLayout>
<Button Text="Save"
BackgroundColor="Accent"/>
</StackLayout>
</Frame>
</ContentView>
</AbsoluteLayout>
</ContentPage.Content>
</ContentPage>
And in the code behind we set the name of the tabs. Here please put attention in the fact that i am supposing an element tree of a StackLayout -> Frame -> Label. If you change the IndicatorTemplate, you will have to also modify this part of the code!
Page1.xaml.cs
using System.Linq;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace overlayTest
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class Page1 : ContentPage
{
public Page1()
{
InitializeComponent();
indicatorView.PropertyChanged += (s, a) =>
{
if (a.PropertyName == IndicatorView.HeightProperty.PropertyName)
{
var indicators = indicatorView.IndicatorLayout.Children.ToList();
int counter = 0;
foreach(var indicator in indicators)
{
var indicatorBaseStack = (StackLayout)indicator;
var indicatorFrame = (Frame)indicatorBaseStack.Children[0];
var indicatorFrameLabel = (Label)indicatorFrame.Content;
indicatorFrameLabel.Text = counter == 0 ? "View1" : "View2";
counter++;
}
}
};
}
}
}
Finally set that Page to the MainPage property of App:
public App()
{
InitializeComponent();
MainPage = new Page1();
}
The final result looks like this:
As a workaround, you could set ToolbarItem of each ContentPage (or you can define a base ContentPage).
<ContentPage.ToolbarItems>
<ToolbarItem Text="Example Item"
IconImageSource="xxx.png"
Order="Secondary"
Clicked="{Binding xx}"
Priority="0" />
<ToolbarItem Text="Example Item"
IconImageSource="xxx.png"
Order="Secondary"
Priority="1" />
<ToolbarItem Text="Example Item"
IconImageSource="xxx.png"
Order="Secondary"
Priority="2" />
</ContentPage.ToolbarItems>
I recommend creating a BaseContentPage that includes a static FloatingButton. This allows every page to inherit from BaseContentPage and use the same FloatingButton.
Code
BaseContentPage
abstract class BaseContentPage : ContentPage
{
protected static Button Button { get; } = new Button { Text = $"This button was created at {DateTimeOffset.UtcNow}" }.Invoke(button => button.Clicked += HandleButtonClicked);
static async void HandleButtonClicked(object sender, EventArgs e) =>
await Application.Current.MainPage.DisplayAlert("Button Clicked", "This is the same button on both pages", "OK");
}
Example LabelPage
class LabelPage : BaseButtonPage
{
public LabelPage()
{
Title = "LabelPage";
Content = new StackLayout
{
Children =
{
new Label { Text = "Label Page" }.TextCenter().Center(),
Button
}
}
}
}
Example ButtonPage
class ButtonPage : BaseButtonPage
{
public ButtonPage()
{
Title = "ButtonPage";
Content = Button;
}
}
Example App
public class App : Application
{
public App()
{
Device.SetFlags(new[] { "Markup_Experimental" });
MainPage = new TabbedPage
{
Children =
{
new ButtonPage(),
new LabelPage()
}
};
}
}
Sample App
Here is the sample app used to create the attached GIF:
https://github.com/brminnick/TabbedPageButton/
I'm a beginner in mobile app development and I'm developing an android app using Xamarin forms for a project.
it has 3 tabbed pages.
each page needs some actions to be done when a user clicks on something.
since there are few actions in one tab to be clicked and actions are different for each tab, I want to show both toolbar and tab bar at the same time just like "Whatsapp" shows in there interface.
I have 3 pages named Farm, Treatments, and Autopsy.
all 3 pages are showing as tabbed pages in the tabbedPageContainer XAML.
this is the tabbedPageContainer XAML Code
<TabbedPage 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="TabbedForms.TabbedPages.TabbedPageContainer"
xmlns:pages="clr-namespace:TabbedForms.TabbedPages"
>
<pages:page_Farm />
<pages:Page_Treatments/>
<pages:Page_Autopsy/>
</TabbedPage>
and this TabbedPageContainer is my Main page.
What I have so far is something like this
but what I want is something like this
how can I achieve this in Xamarin forms XAML?
This is the App.XAML
using System;
using TabbedForms.TabbedPages;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace TabbedForms
{
public partial class App : Application
{
public App()
{
InitializeComponent();
MainPage = new TabbedPageContainer();
//Background color
//MainPage.SetValue(NavigationPage.BarBackgroundColorProperty, Color.Black);
//Title color
// MainPage.SetValue(NavigationPage.BarTextColorProperty, Color.White);
}
protected override void OnStart()
{
}
protected override void OnSleep()
{
}
protected override void OnResume()
{
}
}
}
I'm using VS 2019 Enterprise edition and testing on android 8.1
App.Xaml:
public App()
{
InitializeComponent();
MainPage = new NavigationPage( new TabbedPage1());
}
Tab page:
<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage 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"
xmlns:page="clr-namespace:XamarinControls"
x:Class="XamarinControls.TabbedPage1">
<!--Pages can be added as references or inline-->
<page:Page4 Title="Tab 1" />
<ContentPage Title="Tab 2" />
<ContentPage Title="Tab 3" />
</TabbedPage>
Content Page:
<?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"
mc:Ignorable="d"
NavigationPage.HasNavigationBar="True"
x:Class="XamarinControls.Page4">
<ContentPage.ToolbarItems>
<ToolbarItem Text="Add" Priority="0"/>
<ToolbarItem Text="Noti" Priority="1"/>
</ContentPage.ToolbarItems>
<ContentPage.Content>
<StackLayout>
<Label Text="Welcome to Xamarin.Forms!"
VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand" />
</StackLayout>
</ContentPage.Content>
</ContentPage>
It worked for me.
You could put the child ContentPage of the Tabbed in a NavigationPage like
<TabbedPage.Children>
<NavigationPage Title="xxx" IconImageSource="xxx">
<x:Arguments>
<views:ItemsPage1 />
</x:Arguments>
</NavigationPage>
<NavigationPage Title="xxx" IconImageSource="xxx">
<x:Arguments>
<views:ItemsPage2 />
</x:Arguments>
</NavigationPage>
</TabbedPage.Children>
I am new to Xamarin Form Application development and Want to try a simple app that will get string from textfield and place it in label by data binding.
Text field with 20 px margin from both side and vertically center.
Label will be below text field.
When typing in textField, the label will update (MVVM)
UI design will be from XAML.
Thank you.
If you are using Xamarin Forms to achieve this and using DataBinding (MVVM), first in your ViewModel (We will call it MainPageViewModel.cs) you need something like this:
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace SandboxForms.ViewModels
{
public class MainPageViewModel : INotifyPropertyChanged
{
private string _myTextField;
public string MyTextField
{
get { return _myTextField; }
set
{
_myTextField = value;
OnPropertyChanged(nameof(MyTextField));
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged([CallerMemberName] string propertyName = "")
{
var handler = PropertyChanged;
if (handler != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Then in our ContentPage (We will call this one MainPage.xaml):
<?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="SandboxForms.Pages.MainPage"
xmlns:viewmodels="clr-namespace:SandboxForms.ViewModels;SandboxForms">
<ContentPage.BindingContext>
<viewmodels:MainPageViewModel />
</ContentPage.BindingContext>
<ContentPage.Content>
<StackLayout Padding="20">
<!-- I am applying EndAndExpand to the entry and
StartAndExpand to the label to center them each other -->
<Entry
HorizontalOptions="FillAndExpand"
VerticalOptions="EndAndExpand"
Placeholder="Write here and see the magic!!!"
Text="{Binding MyTextField}"/>
<Label
HorizontalTextAlignment="End"
HorizontalOptions="FillAndExpand"
VerticalOptions="StartAndExpand"
Text="{Binding MyTextField}"/>
</StackLayout>
</ContentPage.Content>
</ContentPage>
Here is a few screenshots of the results:
Application starting,
Entering text on your Entry
Hope this works for you, my best regards!
There are two approaches for data binding each of which has merits depending on the situation. The first is MVVM as mentioned previously. This works well for fields that your ViewModel should know about, such as the text in an entry field but this isn't always the case and it's important to have a complete understanding before choosing the right method for your needs.
MVVM Approach
ViewModel
public class MyPageViewModel : INotifyPropertyChanged
{
private string myTextField;
public string MyTextField
{
get { return myTextField; }
set
{
if( !myTextField.Equals( value ) )
{
myTextField = value;
OnPropertyChanged("MyTextField");
}
}
}
}
View
<?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="SandboxForms.Pages.MainPage"
xmlns:viewmodels="clr-namespace:SandboxForms.ViewModels;SandboxForms">
<ContentPage.BindingContext>
<viewmodels:MainPageViewModel />
</ContentPage.BindingContext>
<ContentPage.Content>
<StackLayout Padding="20">
<!-- I am applying EndAndExpand to the entry and
StartAndExpand to the label to center them each other -->
<Entry
HorizontalOptions="FillAndExpand"
VerticalOptions="EndAndExpand"
Placeholder="Write here and see the magic!!!"
Text="{Binding MyTextField}"/>
<Label
HorizontalTextAlignment="End"
HorizontalOptions="FillAndExpand"
VerticalOptions="StartAndExpand"
Text="{Binding MyTextField}"/>
</StackLayout>
</ContentPage.Content>
</ContentPage>
This is generally a preferred approach by most developers as opposed to mixing business logic directly in the code behind of your UI.
There are a number of helpers, and frameworks out there that you can look at if you aren't familiar with this. The following are some of the more popular ones.
MvvmHelpers - James Montemagno
Prism Library (my personal favorite)
Mvvm Cross
Mvvm Light
View Centric Approach
Sometimes it actually would violate the MVVM pattern to directly bind to a property of our ViewModel, and other times we may want to display something in our View without the need of updating a backing field in the ViewModel. As an example we can look at Xamarin's guide to data binding.
<?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="XamlSamples.SliderBindingsPage"
Title="Slider Bindings Page">
<StackLayout>
<Label Text="ROTATION"
BindingContext="{x:Reference Name=slider}"
Rotation="{Binding Path=Value}"
FontAttributes="Bold"
FontSize="Large"
HorizontalOptions="Center"
VerticalOptions="CenterAndExpand" />
<Slider x:Name="slider"
Maximum="360"
VerticalOptions="CenterAndExpand" />
<Label BindingContext="{x:Reference slider}"
Text="{Binding Value,
StringFormat='The angle is {0:F0} degrees'}"
FontAttributes="Bold"
FontSize="Large"
HorizontalOptions="Center"
VerticalOptions="CenterAndExpand" />
</StackLayout>
</ContentPage>
I should note that one of the most common times I would recommend using this approach is with Context Actions in a ListView, since our ViewModel may contain the Command that we want to execute on the individual cell, however the cell in which we are executing the context action actually is bound to the object from our IEnumerable<T> and not our ViewModel. In this particular case we would do something like the following:
<?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:Name="someListPage"
x:Class="MyApp.Views.SomeListPage">
<ListView ItemsSource="{Binding Gear}"
CachingStrategy="RecycleElement"
IsRefreshing="{Binding IsRefreshing}"
IsPullToRefreshEnabled="True"
RefreshCommand="{Binding RefreshCommand}">
<ListView.ItemTemplate>
<DataTemplate>
<TextCell Text="{Binding Description}" Detail="{Binding Detail}">
<TextCell.ContextActions>
<MenuItem Text="Remove"
Command="{Binding BindingContext.RemoveItemCommand,Source={x:Reference someListPage}}"
CommandParameter="{Binding .}"
IsDestructive="True" />
</TextCell.ContextActions>
</TextCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ContentPage>
You'll notice that for this to work we first give the page itself a name that we can then reference for our binding for the ContextAction Command property. This is only changing where we are looking for this single property. We then resume using the normal binding context for the CommandParameter property and pass in the actual object the cell is bound to with {Binding .}
Hope this helps you better understand your options for binding with Xaml. Happy Coding!
I'm used to Android development, and am having some difficulty accomplishing what I would think is a simple task.
I have a MasterDetailPage (called ContainerView.xaml).
The Master is my navigation bar (called NavbarView.xaml).
The Details is supposed to be a page with a fixed title bar, and a "view" I can can swap per user choices.
The Details page is called MainView.xaml.
The Title I'd like to display at the top and is called TitleBarView.xaml.
Then I have a number of content pages such as Page1View.xaml.
in my ContainerView.xaml:
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.ContainerView"
IsGestureEnabled="True"
MasterBehavior="Popover"
Title="MasterDetail Page">
<MasterDetailPage.Master>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
</MasterDetailPage.Detail>
</MasterDetailPage>
in my NavbarView.xaml - this is the Master
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.NavBarView"
Title="Nav Bar">
<ContentPage.Content>
<StackLayout Orientation="Vertical">
<Label Text="{Binding Item1}"/>
<Button Text="Options" Command="{Binding Option1Command}"/>
</StackLayout >
</ContentPage.Content>
</ContentPage>
in my MainView.xaml - this is the details
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.MainView"
Title="Main View">
<ContentPage.Content>
// what to put here to show the TitleBarView.xaml?
// what to put here to show my content xaml pages?
</ContentPage.Content>
</ContentPage>
in my TitleBarView.xaml
<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.TitleBarView">
<ContentView.Content>
<StackLayout Orientation="Horizontal">
<Label Text="{Binding Item1}"/>
<Button Text="Options" Command="{Binding OptionsCommand}"/>
</StackLayout>
</ContentView.Content>
</ContentView>
and a generic content view, of course there will be many others I want to switch between
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.Page1View">
<ContentView.Content>
<StackLayout Orientation="Vertical">
<Label Text="{Binding Info}"/>
<Button Text="Log In" Command="{Binding GoToPage2Command}"/>
</StackLayout >
</ContentView.Content>
</ContentView>
I am using the MVVM model and have this code, but can't seem to get just the basics working.
The Master page displays fine.
If the Details page is just a simple page, it works, but I can't figure out how to insert the TitleBar and swap out the "Content".
ContainerView containerPage = new ContainerView();
ContainerViewModel containerVM = new ContainerViewModel();
containerPage.BindingContext = containerVM;
NavBarView navigationBar = new NavBarView();
navigationBar.Title = "Navigation Bar"; // required, otherwise I get an exception.
NavBarViewModel navigationBarVM = new NavBarViewModel();
navigationBar.BindingContext = navigationBarVM;
MainView mainView = new MainView();
mainView.Title = "MainView";
MainViewModel mainViewVM = new MainViewModel();
mainView.BindingContext = mainViewVM;
TitleBarView titleBar = new TitleBarView();
TitleBarViewModel titleBarVM = new TitleBarViewModel();
titleBar.BindingContext = titleBarVM;
Page1View page1 = new Page1View();
Page1ViewModel page1VM = new Page1ViewModel();
page1.BindingContext = page1VM;
mainView.Content = new StackLayout()
{
Orientation = StackOrientation.Vertical,
Children =
{
new Label { Text = "I'm Content!" },
new Label { Text = "I'm Content!" },
//titleBar.Content,
//loginView.Content
}
};
containerPage.MasterBehavior = MasterBehavior.Popover;
containerPage.Master = navigationBar;
containerPage.Detail = new NavigationPage(mainView);
I'm sure I'm missing a fundamental concept. Any help would be appreciated
Xaml can instantiate any control, defined in code or in Xaml, so in case of TitleBarView, you can instantiate it in any Xaml by
<xmlnsprefix:TitleBarView />
The problem is to set the right xmlnsprefix. Every xaml file define a few xmlns and you can add your own, like this:
xmlns:local="clr-namespace:MyApp"
and it'll mean that the Xml namespace 'local' will reference the clr namespace 'MyApp' in the current assembly.
So you MainView becomes:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:MyApp"
x:Class="MyApp.MainView"
Title="Main View">
<ContentPage.Content>
<local:TitleBarView />
</ContentPage.Content>
</ContentPage>
I am trying to link my XAML ViewCell with the c# counterpart and use it with listview.
WeatherCell.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ViewCell xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Name="cell"
x:Class="UI.WeatherCell">
<ViewCell.View>
<StackLayout Orientation="Vertical" Padding="10">
<Label Text="WeatherCell"
x:Name="TempLabel"
VerticalOptions="Center"
HorizontalOptions="Center" />
<Label Text="WeatherCell"
x:Name="LocationLabel"
VerticalOptions="Center"
HorizontalOptions="Center" />
</StackLayout>
</ViewCell.View>
</ViewCell >
WeatherCell.cs
namespace UI
{
public partial class WeatherCell : ViewCell
{
public WeatherCell()
{
InitializeComponent();
}
}
}
Referred in MainPage.cs as follows
this.WeatherListView.ItemsSource = Weather.Weather.DataFactory.genForecast();
this.WeatherListView.ItemTemplate = new DataTemplate(typeof(WeatherCell));
While building I get error as
'Page' is not supported by the specific combination of the project's targets. \WeatherCell.xaml.
My guesss was x:Class="UI.WeatherCell" will link both the xaml and cs. What am I doing wrong?
Changing build action for WeatherCell.xaml fixed the problem.
it has to be set to EmbeddedResource
Build Action property can be found in file properties context menu.
Right Click the xaml file and click Properties.
Under Properties select Embedded Resource.
Rebuild your project.