Context
I am using the ExrinSampleMobileApp from the Exrin repository.
Question
How can I set the main and detail tab's title?
I tried to set the appropriate view's title with no effect (DetaiView and MainView)
Because everything is wrapped in a NavigationPage, you need to set the Title of the NavigationPage. The easiest way to do this is via the Stack.
When you pass through a new NavigationPage, set it's title, as shown here.
public class MainStack : BaseStack
{
public MainStack(IViewService viewService)
: base(new NavigationProxy(new NavigationPage() { Title = "My Title" }),
viewService,
Stacks.Main,
nameof(Main.Main))
{
ShowNavigationBar = false;
}
protected override void Map()
{
base.NavigationMap<AboutView, AboutViewModel>(nameof(Main.About));
base.NavigationMap<MainView, MainViewModel>(nameof(Main.Main));
base.NavigationMap<SettingsView, SettingsViewModel>(nameof(Main.Settings));
base.NavigationMap<View.ListView, ListViewModel>(nameof(Main.List));
base.NavigationMap<DetailView, DetailViewModel>(nameof(Main.Detail));
}
}
Related
Hello i am trying to set icon of bottom nav bar
Icon
But everytime it changes color of whole icon and then it look like this
Icon
Is it possible to not give icon color so it wont change whole icon?
You could try to use the custom renderer to the set the icon. And set the ItemIconTintList to null.
[assembly: ExportRenderer(typeof(AppShell), typeof(ShellCustomRenderer))]
namespace App_Shell.Droid
{
class ShellCustomRenderer : ShellRenderer
{
public ShellCustomRenderer(Context context) : base(context)
{
}
protected override IShellBottomNavViewAppearanceTracker CreateBottomNavViewAppearanceTracker(ShellItem shellItem)
{
return new CustomBottomNavAppearance();
}
}
public class CustomBottomNavAppearance : IShellBottomNavViewAppearanceTracker
{
public void Dispose()
{
}
public void ResetAppearance(BottomNavigationView bottomView)
{
}
public void SetAppearance(BottomNavigationView bottomView, IShellAppearanceElement appearance)
{
bottomView.ItemIconTintList = null;
IMenu myMenu = bottomView.Menu;
IMenuItem myItemOne = myMenu.GetItem(0);
if (myItemOne.IsChecked)
{
myItemOne.SetIcon(Resource.Drawable.cactus_24px); // selected icon
}
else
{
myItemOne.SetIcon(Resource.Drawable.icon_about); //default icon
}
}
}
}
Update:
If you want to change the burger icon of shell, you could use Custom renderer to reset the icon vis CreateToolbarAppearanceTracker.
For more details, you could refer to the thread i done before. How to hide back button in navigation bar using Xamarin.Forms - AppShell?
If you want to change the back button color of navigation bar, you could set in style. Please check the link below. Change back button color in Xamarin.Android
I'm creating an app using xamarin Forms (multiplatform), I'm using a Navigation page, but I want to change the arrow ("<-") to text ("back")
Do you know how could i do it?
Thanks
(I'm going to use it in an Android App, but I'm creating the app using Xamarin forms)
You could use custom renderer to remove the navigation icon and set it with text. But, when you do that, you need to capture the click of the text and simulate the back event.
Create the interface:
public class CustomNavigationPage : NavigationPage
{
public CustomNavigationPage(Page startupPage) : base(startupPage)
{
}
}
The implementation of Android:
[assembly: ExportRenderer(typeof(CustomNavigationPage),
typeof(NavigationPageRenderer_Droid))]
namespace NavigationPageDemo.Droid
{
public class NavigationPageRenderer_Droid : NavigationPageRenderer
{
public Android.Support.V7.Widget.Toolbar toolbar;
public Activity context;
public NavigationPageRenderer_Droid(Context context) : base(context)
{
}
protected override Task<bool> OnPushAsync(Page view, bool animated)
{
var retVal = base.OnPushAsync(view, animated);
context = (Activity)Forms.Context;
toolbar = context.FindViewById<Android.Support.V7.Widget.Toolbar>(Droid.Resource.Id.toolbar);
if (toolbar != null)
{
//if (toolbar.NavigationIcon != null)
//{
//toolbar.NavigationIcon = Android.Support.V7.Content.Res.AppCompatResources.GetDrawable(context, Resource.Drawable.back);
//toolbar.NavigationIcon = null;
toolbar.NavigationIcon = null;
toolbar.Title = "back";
toolbar.SetOnClickListener(new OnClick());
//}
}
return retVal;
}
protected override Task<bool> OnPopViewAsync(Page page, bool animated)
{
return base.OnPopViewAsync(page, animated);
}
}
public class OnClick : Java.Lang.Object, IOnClickListener
{
void IOnClickListener.OnClick(Android.Views.View v)
{
App.Current.MainPage.Navigation.PopAsync();
}
}
In the custom renderer, use the OnClickListener to capture the click on text.
when you are working with xamarin forms it is suggested make use of common components and make least use of custom renderer.
Now for your requirement you want to create custom navigation bar
so here is how you can do it.
Create BaseContent Page
Create a Control Template inside your base page your can follow this link
Inside your control template using a grid view place your label with text binding (Back),also your can place a label in center to show title of page again u can make use of template binding which u would come to know when u go through the link
Now inherit your main page with your basecontentpage page
add your control template inside your main page
turn off your navigation bar of your main page
and you are done, this would give u more power to add more things like image or toolbar in your navbar
also to dynamically handle your back button u can check the count from navigationstack if its 0 u can show Humburger Icon or if its more than 0 u can show your label using IsVisible True/False
I'm doing like so:
<Controls:MetroWindow x:Class="BS.Expert.Client.App.Views.ShellView"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
ShowTitleBar="True"
Title="My Title">
The thing is that this is at the same time a defined main conductor on the main window with which I control navigation through other windows, so I'm not able to inherit from MetroWindow to at least trying change the title in the ViewModel:
public class ShellViewModel : Conductor<IScreen>.Collection.OneActive, IShell
{
public ShellViewModel()
{
#region mahApps Theme Loading
var theme = ThemeManager.DetectAppStyle(Application.Current);
var appTheme = ThemeManager.GetAppTheme(App.Configuration.Theme);
ThemeManager.ChangeAppStyle(Application.Current, theme.Item2, appTheme);
#endregion
//TODO: Changing Title here is not possible ((MetroWindow)this).Title = "No way";
// Tudo bem na seguinte liña
LocalizeDictionary.Instance.Culture = new System.Globalization.CultureInfo("pt-BR");
ShowPageOne();
}
public void ShowPageOne()
{
ActivateItem(new PageOneViewModel());
}
}
How should I change the title?
When using the MVVM pattern you should never try to set anything on the view directly in the view model like this. Instead using data binding to accomplish this.
So you would have a property on your ShellViewModel with something like:
public string MyTitle
{
get { return _myTitle; }
set
{
_myTitle = value;
//Insert your property change code here (not sure of the caliburn micro version)
}
}
and in your window xaml it would be something like:
<Controls:MetroWindow
Title="{Binding MyTitle}"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
...
>
I want to manage the nav bar appearence in the xaml?
And how can I manage the nav bar appearence in a Tabbed Page?
NavigationBar.SetHasNavigationBar(tabPage,true) seems not working.
Thank you all,
Ilenia
Maybe check that your mainpage is wrapped with NavigationPage in the public App() function:
MainPage = new NavigationPage(new LoginPage());
Changing the color of your navigation bar
To change the color of your navigation bar generically using Xamarin.Forms so that you only need to change the properties in one place, I'd suggest you add the following to your App.cs file like mentioned in this post on the Xamarin Forums.
Changing the color of the tab bar
Unfortunately, changing the color of the Tab Bar is currently not supported in xaml.
You will although need to write a customer renderer for iOS like so:
[assembly: ExportRenderer(typeof(TabbedPage), typeof(CustomTabbedPageRenderer))]
namespace JetAdvice_Free.iOS.Renderers
{
class CustomTabbedPageRenderer : TabbedRenderer
{
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
TabBar.TintColor = MonoTouch.UIKit.UIColor.Black;
TabBar.BarTintColor = MonoTouch.UIKit.UIColor.FromRGB(255, 128, 0);
}
}
}
Then, whenever you use a TappedPage on iOS, the background color will be applied to your tab bar.
You can set the navigationbar color only when you initialize your navigationpage like so:
new NavigationPage(your page here)
{
BarBackgroundColor = Color.Green,
BarTextColor = Color.White
};
For the issue of setting the tintcolor of the tabbar I recommend using a renderer like so:
public class TabPage_iOS : TabbedRenderer
{
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
this.TabBar.TintColor = Color.Blue.ToUIColor();
UITableView tableView = (UITableView)this.MoreNavigationController.TopViewController.View;
tableView.TintColor = this.TabBar.TintColor;
}
}
I'm trying to follow the standard approach to creating a custom UINavigationBar in order to change its background image, but have found an issue in the subclassing process. If I subclass UINavigationController, with the intent of overriding the virtual NavigationBar property to provide my own implementation, all navigation items (any left or right buttons, and the title view) disappear. At first I thought it was due to the background being rendered over top of the navigation items, but I can reproduce the problem with a no-op subclass.
It's reproducible with the following code:
[Register("NavigationBar")]
public class NavigationBar : UINavigationBar
{
public NavigationBar () : base()
{
}
public NavigationBar (NSCoder coder) : base(coder)
{
}
public NavigationBar (IntPtr ptr) : base(ptr)
{
}
public NavigationBar (NSObjectFlag t) : base(t)
{
}
public NavigationBar (RectangleF frame) : base(frame)
{
}
}
[Register("NavigationController")]
public class NavigationController : UINavigationController
{
private UINavigationBar _navBar;
public NavigationController () : base()
{
}
public NavigationController (NSCoder coder) : base(coder)
{
}
public NavigationController (IntPtr ptr) : base(ptr)
{
}
public NavigationController (NSObjectFlag t) : base(t)
{
}
public override UINavigationBar NavigationBar
{
get
{
if(_navBar == null)
{
return base.NavigationBar;
}
return _navBar;
}
}
public void SetNavigationBar(UINavigationBar navigationBar)
{
_navBar = (UINavigationBar)navigationBar;
}
}
Now, all you need to do to lose your navigation items is to use the custom classes instead of the default ones:
var navigationBar = new NavigationBar();
navigationBar.BarStyle = UIBarStyle.Black;
navigationBar.TintColor = HeaderColor;
var navigationController = new NavigationController();
navigationController.SetNavigationBar(navigationBar);
// ...
Well, your SetNavigationBar() method doesn't pass that down to the native base class and since you don't do any explicit drawing yourself, how is the native drawing code ever supposed to be invoked for your custom NavigationBar class?
In your example code, that NavigationBar is just floating around in space and never gets told to draw.
In order to subclass UINavigationBar, you must define the IntPtr constructor in your derived class and instantiate the UINavigationController using the public UINavigationController(Type navigationBarType, Type toolbarType) constructor. Example:
public class MyNavigationBar: UINavigationBar
{
public MyNavigationBar(IntPtr h) : base(h)
{
}
// Do something.
}
....
var navController = new UINavigationController(typeof(MyNavigationBar), typeof(UIToolbar));
Took me a while to figure it out. More information on this page: http://developer.xamarin.com/guides/ios/platform_features/introduction_to_ios_6/ in section Subclassing UINavigationBar.
Can you create a sample project where you're adding NavigationItems directly to a UINavigationController and then using the sub-classed UINavigationController/UINavigationBar causes these buttons to disappear?
Thanks,
ChrisNTR
After a lot of research and back and forth with Xamarin, the answer to this problem is that you must use an IB stub file that is essentially no-op, but exists to shuttle the desired base type for your navigation elements. There is a working example on my OSS project: http://github.com/danielcrenna/artapp