I have a very simple Xamarin Forms application that navigates between two pages.
On the second page (the page being navigated to) the following XAML content exists:
<StackLayout>
<Button Text="TEST" />
</StackLayout>
When the page has this content, the page appears to render correctly. However, if I change the XAML to this:
<StackLayout HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand">
<Button Text="TEST" />
</StackLayout>
The button background appears to be transparent until I hover over the button. It appears that any combination of values for the HorizontalOptions and VerticalOptions properties causes this effect.
Interestingly, if I set the second page as the root page, the button background is not transparent even when the properties are set.
I am using the Prism framework if that makes any difference.
What am I missing? Is this behavior correct?
Should anyone stumble upon this question, I submitted an issue on GitHub (here). It has been confirmed as a bug.
Related
I'm relatively new to Xamarin Forms. I'm trying to have a view that allows me to swipe left/right between different pages with a page indicator at the bottom. I'm using CarouselView, as suggested by the internet, and it seems to work. But, the selected page is very buggy. Sometimes, swiping to the next page causes it to snap back to the previous page. Sometimes, it stays on the current page. Sometimes, it works correctly. I observe the same behavior on both Android and UWP. Although, it appears to be a little worse in UWP than Android.
It seems the index for the current page is getting mixed up somehow. Here is my XAML:
<ContentPage.Content>
<StackLayout>
<CarouselView x:Name="Pages" IndicatorView="{x:Reference ActivePageIndicator}">
<CarouselView.ItemsSource>
<x:Array Type="{x:Type ContentView}">
<views:TroubleshootingPage />
<views:StatusPage />
<views:ContactInfoPage />
</x:Array>
</CarouselView.ItemsSource>
<CarouselView.ItemTemplate>
<DataTemplate>
<ContentView Content="{Binding .}" />
</DataTemplate>
</CarouselView.ItemTemplate>
</CarouselView>
<IndicatorView
x:Name="ActivePageIndicator"
IndicatorColor="LightGray"
SelectedIndicatorColor="Green"
IndicatorSize="16"
IndicatorsShape="Circle"
HorizontalOptions="Center"
Margin="4"
/>
</StackLayout>
</ContentPage.Content>
I've tried using different types of views in the ItemsSource list. But, I still get the same effect.
Is there something I'm doing wrong? Something I'm missing? A bug in CarouselView?
Thanks.
I have a Xamarin.ios project running on Visual Studio for Imac.
I would like to display a png image file using XAML and C#. Would it be best to use a dependency service to construct the image object in C#?
code snippet:
<StackLayout Orientation="Horizontal">
<Image Name="MyImage" Width="180" />
</StackLayout>
I placed my png file in the assets.xcassents folder. The file name is picture.png. How would I get this code to display in the xaml? What would the
code look like. Thanks for your input.
In your case you can use the property Source of the Image tag in XAML. Than you are able to use the following code snippet:
<StackLayout Orientation="Horizontal">
<Image x:Name="MyImage" Source="picture.png" WidthRequest="180" />
</StackLayout>
And there was another issue in your XAML snippet, because the property Width is a readonly property for internal use by Xamarin.Forms. So if you want to specify the width of the image you must use the WidthRequest property.
Got the code working! Changed to BundleResouces and do not copy for the property on the image file. Also move image File to a separate folder.
I'm using a MasterDetailPage in my Xamarin.Forms application.
To creat the menu items, I use buttons
<MasterDetailPage.Master>
<ContentPage Title="Menu">
<StackLayout Orientation="Vertical">
<Button Text="Club-House" Command="{Binding ClubHouseCommand}" />
<Button Text="Parcours" />
<BoxView VerticalOptions="CenterAndExpand" />
<Button Text="A propos" Command="{Binding AProposCommand}" VerticalOptions="End" />
</StackLayout>
</ContentPage>
</MasterDetailPage.Master>
Is there a better way to do it ? I was thinking about something more menuish like MenuItem or else.
Thanks
There is nothing standard for implementing a menu in the Master page.
You can use
ListView
StackLayout
Grid
Or a combination. StackLayout and ListView will most likely be your best options. Personally I go for a StackLayout because it's quicker to code and render than a ListView, which may come with more issues than advantages. However if I have a large menu (which I try to avoid), ListView may be quicker to code. But ListViews are generally meant for dynamically loaded data, not static.
As for the elements, the most common will be
Button
Label
While buttons are designed for clicking, sometimes I move to label's if I don't want to have to undo all the default styling, and use the TapGestureRecognizer.
You can create a new User Control for a menu item, to avoid code replication.
All up, there is no standard. Make it easy to code and understand, and quick to render. How you do that, depends on your requirements.
I have a form page with many fields after editing user have to scroll down all the way down to click save button. Which seems like not user friendly experience i want to move that button at top right position in content page. SO far i found a thing name ToolBarItems in which i can add button but this not helped.
Have you tried adding a ToolbarItem to your page. You can do this in Xaml like so:
<ContentPage.ToolbarItems>
<ToolbarItem Name="Menu1" Activated="OnClick" Order="Primary" Priority="0" />
<ToolbarItem Name="Menu2" Activated="OnClick" Order="Primary" Priority="1" />
</ContentPage.ToolbarItems>
Or if you prefer code behind that can also be done like so:
page.ToolbarItems.Add (new ToolbarItem (....));
Ref: http://codeworks.it/blog/?p=232
I am a complete noob to xamarin :)
So was wondering if someone could point me to right resources.
To be short, I want to implement something like this in prism using Xamarin MasterDetailPage.
Using the master detail sample here, the hamburger menu doesn't act as a fly out.
<MasterDetailPage 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="HelloWorld.Views.MyMasterDetail">
<MasterDetailPage.Master>
<ContentPage Title="Default">
<StackLayout>
<Button Text="ViewA" Command="{Binding NavigateCommand}" CommandParameter="MyNavigationPage/ViewA?id=A" />
<Button Text="ViewB" Command="{Binding NavigateCommand}" CommandParameter="MyNavigationPage/ViewB?id=B" />
<Button Text="ViewC" Command="{Binding NavigateCommand}" CommandParameter="MyNavigationPage/ViewC?id=C" />
</StackLayout>
</ContentPage>
</MasterDetailPage.Master>
</MasterDetailPage>
Right now, though there is enough space, it shows something like
(just as a sample, I am not using SplitViewMenu at all)
I need icons/some small text to show initially and on clicking hamburger, it should expand (you know just like the first link/ groove music app behavior).
Tips?
Right now, though there is enough space, it shows something like
In my experience, if you have assigned the Symbol property for SimpleNavMenuItem, the possible reason is you haven't imported the Themes file Generic.xaml under Themes folder
This file includes templates, styles for custom controls. For example, for NavMenuItem's template, FontIcon's Glyph property needs to be assigned correctly here:
<DataTemplate x:Key="NavMenuItemTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="48" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<FontIcon FontSize="16" Glyph="{Binding Path=SymbolAsChar}" VerticalAlignment="Center"
HorizontalAlignment="Center" ToolTipService.ToolTip="{Binding Path=Label}" />
<TextBlock Grid.Column="1" Text="{Binding Path=Label}" VerticalAlignment="Center" />
</Grid>
</DataTemplate>
While SimpleNavMenuItem class's SymbolAsChar property is based on Symbol's value:
public sealed class SimpleNavMenuItem : INavigationMenuItem
{
......
public Symbol Symbol { get; set; }
public char SymbolAsChar => (char) Symbol;
......
}
And if you still can make it work, please share a demo:)
I've sort of been looking for something like this myself since I can't hide the NavigationBar shown in the Master page of the MasterDetailPage when i run it on a Windows 10 Mobile device (I can hide for PC though). So basically, I'm looking into eventually building my own version of the MasterDetailPage.
Since I have not built it yet, I can't tell you exactly how to achieve what you're asking, but I do know that it will require you to either:
Write your own custom renderer for MasterDetailView or,
Write a new control and its renderer
In both cases, your renderer will involve creating and manipulating a new SplitView (which is the native UWP control that your SplitViewMenu example is extending). There's a tutorial for creating the actual UWP control here. If you havent learned about Xamarin's renderers yet, they are the "Translator" and "Interpreter" between a Xamarin.Forms control and a given platform's native control. I suspect Xamarin will eventually rewrite their MastDetailPage renderer for UWP to use a SplitView as a base, but who knows when that will be. Xamarin also has an open source SDK for Xamarin.Forms (as well as the others) on GitHub so you can study the MasterDetailPageRenderer for UWP.