Couldn't get basic Hamburger Master Detail view - xamarin

After looking at all the questions and forums, I'm still unable to get my Master Detail page with Hamburger icon. If i use this Master detail page as application start then I'm seeing the functionality working as expected. Please look at the code below
DashBoadCreator.xaml
`
<MasterDetailPage.Master>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
</x:Arguments>
</NavigationPage>
</MasterDetailPage.Detail>
`
`public partial class DashBoadCreator : MasterDetailPage
{
DashboardMaster master;
DashboardDetail1 detil;
public DashBoadCreator()
{
InitializeComponent();
master = new DashboardMaster();
detil = new DashboardDetail1();
Master = master;
Master.Title = "this is a title";
Master.Icon = "icon.png";
Detail = new NavigationPage(detil);
}
// Event for Menu Item selection, here we are going to handle navigation based
// on user selection in menu ListView
}`
DashboadMaster.xaml
`
<!--
This StackLayout you can use for other
data that you want to have in your menu drawer
<StackLayout BackgroundColor="#e74c3c"
HeightRequest="75">
<Label Text="Some Text title"
FontSize="20"
VerticalOptions="CenterAndExpand"
TextColor="White"
HorizontalOptions="Center"/>
</StackLayout> -->
<ListView x:Name="navigationDrawerList"
RowHeight="60"
SeparatorVisibility="None"
BackgroundColor="#e8e8e8"
ItemSelected="OnMenuItemSelected">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<!-- Main design for our menu items -->
<StackLayout VerticalOptions="FillAndExpand"
Orientation="Horizontal"
Padding="20,10,0,10"
Spacing="20">
<Image Source="{Binding Icon}"
WidthRequest="40"
HeightRequest="40"
VerticalOptions="Center" />
<Label Text="{Binding Title}"
FontSize="Medium"
VerticalOptions="Center"
TextColor="Black"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
`
` public partial class DashboardMaster : ContentPage
{
public List<MasterPageItem> menuList { get; set; }
public DashboardMaster()
{
Title = "samples";
InitializeComponent();
menuList = new List<MasterPageItem>();
// Creating our pages for menu navigation
// Here you can define title for item,
// icon on the left side, and page that you want to open after selection
var page1 = new MasterPageItem() { Title = "Item 1", Icon = "itemIcon1.png", TargetType = typeof(DashboardDetail1) };
var page2 = new MasterPageItem() { Title = "Item 2", Icon = "itemIcon2.png", TargetType = typeof(DashboardDetail1) };
var page3 = new MasterPageItem() { Title = "Item 3", Icon = "itemIcon3.png", TargetType = typeof(DashboardDetail1) };
var page4 = new MasterPageItem() { Title = "Item 4", Icon = "itemIcon4.png", TargetType = typeof(DashboardDetail1) };
var page5 = new MasterPageItem() { Title = "Item 5", Icon = "itemIcon5.png", TargetType = typeof(DashboardDetail1) };
var page6 = new MasterPageItem() { Title = "Item 6", Icon = "itemIcon6.png", TargetType = typeof(DashboardDetail1) };
var page7 = new MasterPageItem() { Title = "Item 7", Icon = "itemIcon7.png", TargetType = typeof(DashboardDetail1) };
var page8 = new MasterPageItem() { Title = "Item 8", Icon = "itemIcon8.png", TargetType = typeof(DashboardDetail1) };
var page9 = new MasterPageItem() { Title = "Item 9", Icon = "itemIcon9.png", TargetType = typeof(DashboardDetail1) };
// Adding menu items to menuList
menuList.Add(page1);
menuList.Add(page2);
menuList.Add(page3);
menuList.Add(page4);
menuList.Add(page5);
menuList.Add(page6);
menuList.Add(page7);
menuList.Add(page8);
menuList.Add(page9);
// Setting our list to be ItemSource for ListView in MainPage.xaml
navigationDrawerList.ItemsSource = menuList;
//Application.Current.MainPage = new DashboardMaster();
// NavigationPage.SetHasNavigationBar(this, false);
}
private void OnMenuItemSelected(object sender, SelectedItemChangedEventArgs e)
{
DashBoadCreator creator = new DashBoadCreator();
var item = (MasterPageItem)e.SelectedItem;
Type page = item.TargetType;
creator.Detail = new NavigationPage((Page)Activator.CreateInstance(page));
creator.IsPresented = false;
}
}
<ListView.ItemTemplate>
<Image Source="{Binding Icon}"
WidthRequest="40"
HeightRequest="40"
VerticalOptions="Center" />
<Label Text="{Binding Title}"
FontSize="Medium"
VerticalOptions="Center"
TextColor="Black"/>
<!-- <Label Text="{Binding Description}"
FontSize="Small"
VerticalOptions="End"/>-->
<StackLayout VerticalOptions="End" HorizontalOptions="End">
<Button Text="Apply" FontSize="10" TextColor="Green" BorderWidth="1" HorizontalOptions="End" />
</StackLayout>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

set icon for master page to see hamburger icon
Sample code :
public masterpage()
{
Icon = "hamburger.png";
}

I coded a working´s demo following a few differents tutos, and getting the most important part of them. So, at least for me, it was a simplier demo I can get it.
Check this link out.
My github working demo
Where Intervection is a random detail page (constructor by parameter).
Let me know aobut any doubt you could have.
Cheers mate. Merry Christmas.

After of some finding I came accorss this discussion
Missing menu button on MasterDetailPage when assigning App.MainPage
Using those findings I changed my app.xaml.cs as follows
MainPage = new NavigationPage(new MenuPage());
MasterDetailTest.App.Current.MainPage.Navigation.PushAsync(new MainPage());
Now the Master page is always the root page and the hamburger menu works as expected. To anyone else having this problem hope this helps you in some way

Related

Xamarin: Binding to ImageSource property is not working

I am trying to display images dynamically through binding:
I have ObservableCollection of TabItem to which I load a png into the Icon Property:
TabItems.Add(new TabItem()
{
Title = AppResources.Home,
IsSelected = true,
Icon = ImageSource.FromResource("Home.png")
});
Where:
public class TabItem : BindableObject
{
private bool _isSelected;
public ImageSource Icon { get; set; }
public string Title { get; set; }
public bool IsSelected
{
get
{
return _isSelected;
}
set
{
if (_isSelected != value)
{
_isSelected = value;
OnPropertyChanged();
}
}
}
}
And I have a DataTemplate of TabItem in a CollectionView that displays these items and uses the Icon Property to bind to Image:
<DataTemplate x:DataType="local:TabItem" x:Key="TabItem_DataTemplate">
<StackLayout Orientation="Vertical" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"
WidthRequest="{Binding Title, Converter={StaticResource ProportionateConverter}}"
>
<Image Source="{Binding Icon}" InputTransparent="True" HeightRequest="50" />
<Label HorizontalOptions="Center" VerticalOptions="End" FontSize="Small"
Text="{Binding Title}"
InputTransparent="True"
TextColor="{Binding IsSelected, Converter={StaticResource IsSelectedToTextColorConverter}}"/>
</StackLayout>
</DataTemplate>
I get an Error in runtime:
ImageLoaderSourceHandler: Image data was invalid: Xamarin.Forms.StreamImageSource
The images are in the Resources folder and are marked as Embedded resource
Updated solution:
(Thanks Jason)
The solution was using my markup extension when initializing the Icon property (I'll be glad to hear of a more elegant way)
var homeExt = new ImageResourceExtension()
{
Source = "TimeManager.Resources.Icons.Home.png"
};
TabItems.Add(new TabItem()
{
Title = AppResources.Home,
IsSelected = true,
Icon = (ImageSource)(homeExt.ProvideValue(null))
});

How to change fontsize of listview in xamarin?

This is my code in my edit.cs
var db = new SQLiteConnection(_dbPath);
StackLayout stackLayout = new StackLayout();
_listView = new ListView();
_listView.ItemsSource = db.Table<SpeechRecTable>().OrderBy(x => x.Text).ToList();
_listView.ItemSelected += _listView_ItemSelected;
//_listView.SeparatorColor = Color.WhiteSmoke;
stackLayout.Children.Add(_listView);
_button = new Button();
_button.Text = "UPDATE";
_button.BackgroundColor = Color.Coral;
_button.TextColor = Color.WhiteSmoke;
_button.Clicked += _button_Clicked;
stackLayout.Children.Add(_button);
Content = stackLayout;
I am new in xamarin, and Im trying to create a CRUD application, I am following this tutorial: https://www.youtube.com/watch?v=aabHAgY5VXo&t=58s
I cant seem to customize its font size, this is just a .cs file, not a xaml.cs file
I show you 2 solution.
In C#
public class CustomCell : ViewCell
{
public CustomCell()
{
var nameLabel = new Label();
var verticaLayout = new StackLayout();
var horizontalLayout = new StackLayout();
//set bindings
nameLabel.SetBinding(Label.TextProperty, new Binding("Name"));
nameLabel.FontSize = 24;
//add views to the view hierarchy
verticaLayout.Children.Add(nameLabel);
horizontalLayout.Children.Add(verticaLayout);
// add to parent view
View = horizontalLayout;
}
}
_listView.ItemTemplate = new DataTemplate(typeof(CustomCell));
or in Xaml
<StackLayout>
<ListView x:Name="ItemsListView"
ItemsSource="{Binding Items}"
VerticalOptions="FillAndExpand"
HasUnevenRows="true"
RefreshCommand="{Binding LoadItemsCommand}"
IsPullToRefreshEnabled="true"
IsRefreshing="{Binding IsBusy, Mode=OneWay}"
CachingStrategy="RecycleElement"
ItemSelected="OnItemSelected">
<d:ListView.ItemsSource>
<x:Array Type="{x:Type x:String}">
<x:String>First Item</x:String>
<x:String>Second Item</x:String>
<x:String>Third Item</x:String>
<x:String>Fourth Item</x:String>
<x:String>Fifth Item</x:String>
<x:String>Sixth Item</x:String>
</x:Array>
</d:ListView.ItemsSource>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Padding="10">
<Label Text="{Binding Text}"
d:Text="{Binding .}"
LineBreakMode="NoWrap"
Style="{DynamicResource ListItemTextStyle}"
FontSize="16" />
<Label Text="{Binding Description}"
d:Text="Item descripton"
LineBreakMode="NoWrap"
Style="{DynamicResource ListItemDetailTextStyle}"
FontSize="13" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
Try modifying your code like this,
var db = new SQLiteConnection(_dbPath);
StackLayout stackLayout = new StackLayout();
ListView _listView = new ListView
{
// template for displaying each item.
ItemTemplate = new DataTemplate(() =>
{
Label nameLabel = new Label();
nameLabel.TextColor = Color.Black;
nameLabel.FontSize = 15;
nameLabel.SetBinding(Label.TextProperty, "Name");
return new ViewCell
{
View = new StackLayout
{
Padding = new Thickness(5),
VerticalOptions = LayoutOptions.Center,
Children =
{
nameLabel
}
}
};
})
};
//_listView.SeparatorColor = Color.WhiteSmoke;
_listView.ItemsSource = db.Table<SpeechRecTable>().OrderBy(x => x.Text).ToList();
_listView.ItemSelected += _listView_ItemSelected;
stackLayout.Children.Add(_listView);
_button = new Button();
_button.Text = "UPDATE";
_button.BackgroundColor = Color.Coral;
_button.TextColor = Color.WhiteSmoke;
_button.Clicked += _button_Clicked;
stackLayout.Children.Add(_button);
Content = stackLayout;

xamarin automatically adjust webview height

How to configure Xamarin Webview to display an automatic height according to html content?
I am developing a news app in Xamarin and I have this problem, because the webview forces me to inform the height and the width to display the information and as my content is dynamic, (always changes) ends up being an empty space on screen!
Sorry for english, I used google translate!
Thanks!
Code: PostView.cs
namespace AppNewsPlay.Views
{
public partial class PostView : TabbedPage
{
private int object_id;
// Criando a Listagem de Ultimas Noticias Playstation
List<PostViewModels> UPost;
public TabbedPage Detail { get; private set; }
public PostView(int object_id)
{
this.object_id = object_id;
UPost = new List<PostViewModels>();
ObterPost();
InitializeComponent();
}
private async void ObterPost()
{
var resp = string.Empty;
try
{
var uri = new HttpClient()
{
BaseAddress = new Uri("http://api.newsplay.com.br")
};
var url = "/api/post/" + this.object_id;
var result = await uri.GetAsync(url);
if (!result.IsSuccessStatusCode)
{
await DisplayAlert("Erro de Conexão", "Não foi possível obter as notícias do servidor, Tente novamente mais tarde!", "OK");
return;
}
resp = await result.Content.ReadAsStringAsync();
}
catch (Exception ex)
{
await DisplayAlert("Erro de Conexão com o Servidor", ex.Message, "OK");
return;
}
// transformando o retorno em objeto através do json e deserealize e retornando em lista
var UPost = JsonConvert.DeserializeObject<List<PostViewModels>>(resp);
var browser = new WebView();
// var htmlsource = new UrlWebViewSource();
foreach (var item in UPost)
{
var html = item.Guid;
browser.Source = html;
}
// Adicionando os itens ao ListView na Home.xaml - Aba Playstation*/
PostViewList.ItemsSource = UPost;
// ProgressLoader.IsRunning = false;
}
Code: PostView.xaml
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="AppNewsPlay.Views.PostView"
Title="Voltar"
Icon=""
BarBackgroundColor="#1c9e33"
>
<TabbedPage.Children>
<ContentPage Title="Notícia" Icon="ic_filter_list_black_24dp.png">
<ContentPage.Content >
<StackLayout
Spacing="20">
<ListView x:Name="PostViewList"
HasUnevenRows="True"
SeparatorColor="White"
SeparatorVisibility="Default"
>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout
Padding="20"
Orientation="Vertical"
>
<Label x:Name="Post_title" Text="{ Binding Post_title }"
FontSize="20"
FontAttributes="Bold"
HorizontalTextAlignment="Center"
/>
<Label x:Name="Post_ad" Text="{Binding Post_ad}"
FontSize="12"
HorizontalTextAlignment="Center"
/>
<WebView HorizontalOptions= "FillAndExpand"
VerticalOptions="FillAndExpand"
HeightRequest="3500"
WidthRequest="650"
x:Name="browser"
Source="{Binding Guid}"
>
</WebView>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage.Content>
</ContentPage>
</TabbedPage.Children>
</TabbedPage>

How can I show HTML inside a Xamarin.Forms page with source for HTML in C#?

I wrote this code to try and show a couple of lines of HTML within a web page:
I have this XAML:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Japanese;assembly=Test"
x:Class="Test.HelpCards"
x:Name="HelpCards"
Title="Help ▹ Cards Tab">
<ContentPage.Content>
<ScrollView>
<StackLayout Spacing="10" Margin="20">
<WebView x:Name="Browser" />
</StackLayout>
</ScrollView>
</ContentPage.Content>
</ContentPage>
public HelpCards()
{
InitializeComponent();
var htmlSource = new HtmlWebViewSource();
htmlSource.Html = #"<html><body>
<h1>ABC</h1>
<p>DEF</p>
</body></html>";
Browser.Source = htmlSource;
}
However when running the code I see only a blank page.
Does anyone have any ideas as to what might be wrong?
Make sure to specify layout-options for WebView.
<ContentPage.Content>
<ScrollView> <!-- ScrollView not needed as WebView has inbuilt scrolling behavior -->
<StackLayout Spacing="10" Margin="20">
<WebView x:Name="Browser" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" />
</StackLayout>
</ScrollView>
</ContentPage.Content>
Xamarin has updated the label element at some point. The update included a way to display HTML in the label element, by adding TextType="Html" to the element.
Example:
<Label TextType="Html">
<![CDATA[
This is <strong style="color:red">HTML</strong> text.
]]>
</Label>
(Source: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/text/label#display-html)
The webview can be in the ContentPage.Content by itself. No need to wrap it in a ScrollView or StackLayout. This method also doesn't require Horizontal or Vetical Options to be specified as well.
<ContentPage.Content>
<WebView x:Name="Browser" />
</ContentPage.Content>
Try this with the webBrowser
public MainPage()
{
InitializeComponent();
CheckWifiOnStart();
CheckWifiContinously();
}
private void CheckWifiOnStart()
{
var source = new HtmlWebViewSource();
source.BaseUrl = "file://android_asset/";
//CONTROL TO SEE IF USER IS CONNECTED
if (!CrossConnectivity.Current.IsConnected)
{
Browser.Source = "file:///android_asset/index.html";
}
else
{
Browser.Source = "ONLINE URL";
}
}
private void CheckWifiContinously()
{
var source = new HtmlWebViewSource();
source.BaseUrl = "file://android_asset/";
//CONTROL TO CONNECTIVITY CHANGE
CrossConnectivity.Current.ConnectivityChanged += (sender, args) => {
if (!CrossConnectivity.Current.IsConnected)
{
DisplayAlert("ERROR", "OFFLINE MODE", "OK");
Browser.Source = "file:///android_asset/index.html";
}
else
{
DisplayAlert("INTERNET DETECTED", "ONLINE MODE", "OK");
Browser.Source = "ONLINE URL";
}
};
}
public interface IBaseUrl { string GetFile(); }

Reinitializing MasterPage is throwing null exception in IOS - Xamarin forms

I have a MDPage which is a MasterDetailPage which calls side menu items list page as Master. The Detail for this is added with a new NavigationPage of a home page.
My code is
public MDPage(){
Master = new SideMenuPage();
InitializeComponent();
masterPage.ListView.ItemSelected += OnItemSelected;
Detail = new NavigationPage(new HomePage())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};}
I have a requirement where the NavigationPage contains a bottom menu such that on clicking a bottom menu, the MDPage needs to be reinitialized to set a new NavigationPage of a different page (say AboutUs page). So i added a parameterized constructor for MDPage and on clicking the bottom menu item i am calling App.Current.MainPage = new MDPage("AboutUs").Below is the parameterized constructor.
public MDPage(string bottomMenuItem)
{
Master = new SideMenuPage();
InitializeComponent();
masterPage.ListView.ItemSelected += OnItemSelected;
if("AboutUs" == bottomMenuItem)
{
Detail = new NavigationPage(new AboutUs())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}}
Here the MDPage constructor is called initially when i open the app. Then from the side menu i have the option to open a HomePage which is added as Detail. Note that this HomePage contains a bottom sub menu, which is nothing but an image. On tapping this, it should again reinitialize the MDPage. Here this is working fine in Andorid. But in iOS, it is throwing null exception. It is not allowing me to set Master = new SideMenuPage(); I have found the root cause by trial and error as this code will not throw exception and it is throwing in the iOS Main.cs file. Please help me.
MainPage - XAML
<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:ClubApp.Views;assembly=ClubApp"
x:Class="ClubApp.Views.MainPage">
<MasterDetailPage.Master>
<local:MasterPage x:Name="masterPage" />
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage>
<x:Arguments>
</x:Arguments>
</NavigationPage>
</MasterDetailPage.Detail>
</MasterDetailPage>
MainPage.xaml.cs
using System.Linq;using System.Text;using System.Threading.Tasks;using Xamarin.Forms;namespace Test.Views{
public partial class MainPage : MasterDetailPage
{
public MainPage()
{
Master = new MasterPage();
InitializeComponent();
masterPage.ListView.ItemSelected += OnItemSelected;
Detail = new NavigationPage(new Views.HomePage())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}
public MainPage(string bottomMenu)
{
Master = new MasterPage();
InitializeComponent();
masterPage.ListView.ItemSelected += OnItemSelected;
if ("News" == bottomMenu)
{
Detail = new NavigationPage(new Views.HomePage())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}
else if ("Profile" == bottomMenu)
{
Detail = new NavigationPage(new Views.Profile())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}
}
async void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
{
try
{
var item = e.SelectedItem as MasterPageItem;
if (item != null)
{
if (item.Title == "News")
{
Detail = new NavigationPage(new Views.NewsPage())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}
if (item.Title == "Home")
{
Detail = new NavigationPage(new Views.HomePage())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}
if (item.Title == "Profile")
{
Detail = new NavigationPage(new Views.Profile())
{
BarBackgroundColor = Color.Black,
BarTextColor = Color.White,
};
}
masterPage.ListView.SelectedItem = null;
IsPresented = false;
}
}
catch (Exception ex)
{
}
}
}}
MasterPage.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="Test.Views.MasterPage"> <ContentPage.Content>
<StackLayout VerticalOptions="FillAndExpand" BackgroundColor="#10000c" Padding = "0,50,0,0" >
<StackLayout x:Name="slUserProfile" Orientation="Vertical" Spacing = "0"
VerticalOptions="FillAndExpand">
<Image Source="{Binding member_image}" x:Name="imgSideImage"
HorizontalOptions="CenterAndExpand" Aspect="AspectFill" HeightRequest="100"
WidthRequest="100" />
<Label Text="{Binding name}" TextColor="#efa747"
FontSize ="17"
HorizontalOptions="CenterAndExpand"/>
</StackLayout >
<ListView x:Name="lvSideMenu" VerticalOptions="FillAndExpand" SeparatorVisibility="None"
BackgroundColor="Black">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Padding="15,5,0,0" Orientation="Horizontal">
<Image Source="{Binding IconSource}"/>
<StackLayout Padding = "10,0,0,0">
<local:CustomLabel Text="{Binding Title}" VerticalOptions="CenterAndExpand"
TextColor="#dac6ac" FontSize ="14"/>
</StackLayout>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout></ContentPage.Content></ContentPage>
MasterPage.xaml.cs
using Xamarin.Forms;namespace Test.Views{
public partial class MasterPage : ContentPage
{
public ListView ListView { get { return lvSideMenu; } }
public Page Detail { get; set; }
public MasterPage()
{
InitializeComponent();
var masterPageItems = new List<MasterPageItem>();
//Fills side menu items.
masterPageItems.Add(new MasterPageItem
{
Title = "Profile",
IconSource = "profile_sidemenu.png"
});
masterPageItems.Add(new MasterPageItem
{
Title = "Home",
IconSource = "home_smenu.png"
});
masterPageItems.Add(new MasterPageItem
{
Title = "News",
IconSource = "news_smenu.png"
});
lvSideMenu.ItemsSource = masterPageItems;
Icon = "menu.png";
Title = "Menu";
}
}
public class MenuItems
{
public string MenuTitle { get; set; }
}
public class MasterPageItem
{
public string Title { get; set; }
public string IconSource { get; set; }
}}
HomePage.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="Test.Views.HomePage" Title="Home"><ContentPage.Content><StackLayout> <Label Text="This is Home page"/></StackLayout></ContentPage.Content></ContentPage>
Profile.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="Test.Views.Profile" Title="Profile"><ContentPage.Content> <StackLayout>
<StackLayout>
<Label Text="This is Profile page" />
</StackLayout>
<StackLayout HeightRequest="80">
<Grid RowSpacing="0" ColumnSpacing="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackLayout x:Name="tProfile" BackgroundColor="Red" Grid.Column="0" Spacing="0" Padding="0,10,0,10">
<Image Source="bprofileSel.png" HorizontalOptions="Center" VerticalOptions="End"/>
<Label Text="Profile" FontSize="10" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalTextAlignment="Center"/>
</StackLayout>
<StackLayout x:Name="tNews" BackgroundColor="Black" Grid.Column="1" Spacing="0" Padding="0,10,0,10">
<Image Source="bNewsUnsel.png" HorizontalOptions="Center" VerticalOptions="End"/>
<local:CustomLabel Text="News" FontSize="10" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalTextAlignment="Center"/>
</StackLayout>
</Grid>
</StackLayout>
</StackLayout></ContentPage.Content></ContentPage>
Profile.xaml.cs
Using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Xamarin.Forms;namespace Test.Views{
public partial class Profile : ContentPage
{
public Profile()
{
InitializeComponent();
try
{
tProfile.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => ProfileClicked()),
});
tNews.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => NewsClicked()),
});
}
catch (Exception ex)
{
}
}
private void ProfileClicked()
{
App.Current.MainPage = new MainPage("Profile");
}
private void NewsClicked()
{
App.Current.MainPage = new MainPage("News");
}
}}
News page can be set similar to the profile page. In app.cs call MainPage = new MainPage()
Here when the app is launched, it will show the HomePage with the side menu. Now when i click a menu (say profile from side menu), it will take me to the profile page and according to the design a bottom submenus can be seen there. Clicking on it will cause the null exception occurring in iOS code. This is working fine in android. My assumption is the root cause is due to MasterPage reinitialization to Master. But i need this requirement to be flown like this. Please help me.
This is the error in iOS Main.cs

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