I wanted to create a page render with ContentPage type. I created so in android and it is working but in IOS there has custom page renderer with same type (ContentPage). It can be removed as this was from nuget package and working on different context.
Here is my code
[assembly: ExportRenderer(typeof(ContentPage), typeof(CustomPageRenderer))]
namespace AlwinInvoiceGenerator.IOS
{
using CoreGraphics;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
public class CustomPageRenderer : PageRenderer
{
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
if (Element == null || !(Element is ContentPage basePage) || basePage.BindingContext == null ||
!(basePage.BindingContext is BaseViewModel baseViewModel))
{
return;
}
SetCustomBackButton(baseViewModel);
}
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
OverrideUserInterfaceStyle = UIUserInterfaceStyle.Light;
}
private void SetCustomBackButton(BaseViewModel baseViewModel)
{
var fakeButton = new UIButton {Frame = new CGRect(0, 0, 50, 40), BackgroundColor = UIColor.Clear};
fakeButton.TouchDown += (sender, e) =>
{
baseViewModel.OnBackButtonClicked();
};
NavigationController?.NavigationBar.AddSubview(fakeButton);
}
}
It seems it not registering and that is why not calling.
I have another page renderer that is register in assembly
[assembly: ExportRenderer(typeof(ContentPage), typeof(IOSToolbarExtensions.iOS.Renderers.IOSToolbarExtensionsContentPageRenderer), Priority = short.MaxValue)]
If I removed this line then above code is working but not two in the same time.
Please help
Same type seems not working for multiple renderer.
I have created sub type of my custom renderer and override the methods which needed to. It is working well
Related
I am trying to bind Jumio Natverify library in Xamarin iOS project by creating Objective c library project.
I have crated ApiDefination.cs and Struct.cs file data using sharpie tool. But when I am trying on run it I am getting Could not create an native instance of the type 'JumioNetverifyBinding.NetverifyConfiguration': the native class hasn't been loaded. exception.
ApiDefinition class - ApiDefinition.cs
Struct class - Struct.cs
Called NetverifyViewController from iOS Binding project:
using Foundation;
using JumioNetverifyBinding;
using System;
using UIKit;
namespace JumioNetverifyDemo
{
public partial class ViewController : UIViewController
{
NetverifyViewController netverifyViewController;
public ViewController(IntPtr handle) : base(handle) { }
public override void ViewDidLoad()
{
StartNetverifyButton.TouchUpInside += startNetverify;
}
public void CreateNetverifyController()
{
NetverifyConfiguration config = new NetverifyConfiguration();
config.ApiToken = "My_token_key";
config.ApiSecret = "Secrate_key";
config.DataCenter = JumioDataCenter.Eu;
config.Delegate = new NetverifyViewControllerDelegateHandler(this);
this.netverifyViewController = new NetverifyViewController(config);
}
public void startNetverify(object sender, EventArgs e)
{
this.CreateNetverifyController();
if (this.netverifyViewController != null)
{
this.PresentViewController(netverifyViewController, true, null);
}
else
{
Console.WriteLine("Netverify Mobile SDK : NetverifyViewController is null");
}
}
public void DisplayAlertAsync(string title = "Alert", string message = "")
{
var okAlertController = UIAlertController.Create(title, message, UIAlertControllerStyle.Alert);
okAlertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(okAlertController, true, null);
}
public class NetverifyViewControllerDelegateHandler : NetverifyViewControllerDelegate
{
private ViewController _viewController;
public NetverifyViewControllerDelegateHandler(ViewController viewController)
{
_viewController = viewController;
}
public override void DidCancelWithError(NetverifyViewController netverifyViewController, NetverifyError error, string scanReference, string accountId)
{
Console.WriteLine("NetverifyViewController did finish initializing, error:" + error.Message);
_viewController.DisplayAlertAsync("Error : " + error.Message);
}
public override void DidFinishWithDocumentData(NetverifyViewController netverifyViewController, NetverifyDocumentData documentData, string scanReference, string accountId, bool authenticationResult)
{
_viewController.DisplayAlertAsync("Scan Reference : " + scanReference);
}
}
}
}
I am looking for anyway to handle this exception and make this library work, if anyone have idea about this? Any help would be appreciated.
I've been working in this project for abou a week and haven't find a solution to my problem.
For testing purposes I create a simple new DeclarativeComponent which is a panelGroupLayout that contains 2 OutputText. After that I deploy the jar file and add it to my other Fusion web application libraries.
I want to add this DeclarativeComponent in another UIComponent at runtime by pressing a button which contains the next code in the javabean:
`public void addComponent(ActionEvent actionEvent)
{
// Add event code here...
createOutputComponent();
}
private void createOutputComponent()
{
CuadroDeTextoComponent ui = new CuadroDeTextoComponent(); //This is my Declarative Component
UIComponent parentUIComponent = getPglComponente(); This is the panelGrouopLayout in which i want to add my declarativeComponent
addComponent(parentUIComponent, ui);
}
public void addComponent(UIComponent parentUIComponent, UIXDeclarativeComponent childUIComponent)
{
parentUIComponent.getChildren().add(childUIComponent);
AdfFacesContext.getCurrentInstance().addPartialTarget(parentUIComponent);
}`
I have tried draging the declarative component and it works, but when I do it dynamically the component doesn't display
For your component to display you may need to add a PPR refresh to it's parent element :
In your case :
public void addComponent(ActionEvent actionEvent)
{
// Add event code here...
createOutputComponent();
}
private void createOutputComponent()
{
CuadroDeTextoComponent ui = new CuadroDeTextoComponent(); //This is my Declarative Component
UIComponent parentUIComponent = getPglComponente(); This is the panelGrouopLayout in which i want to add my declarativeComponent
addComponent(parentUIComponent, ui);
addPPR(parentUIComponent); //Refresh the parent component
}
public void addComponent(UIComponent parentUIComponent, UIXDeclarativeComponent childUIComponent)
{
parentUIComponent.getChildren().add(childUIComponent);
AdfFacesContext.getCurrentInstance().addPartialTarget(parentUIComponent);
}
public static void addPPR(UIComponent component) {
if (component != null) {
AdfFacesContext.getCurrentInstance().addPartialTarget(component.getParent());
}
}
Currently we are building a web application, desktop first, that needs device specific Razor Pages for specific pages. Those pages are really different from their Desktop version and it makes no sense to use responsiveness here.
We have tried to implement our own IViewLocationExpander and also tried to use the MvcDeviceDetector library (which is basically doing the same). Detection of the device type is no problem but for some reason the device specific page is not picked up and it is constantly falling back to the default Index.cshtml.
(edit: We're thinking about implementing something based on IPageConvention, IPageApplicationModelProvider or something ... ;-))
Index.mobile.cshtml
Index.cshtml
We have added the following code using the example of MvcDeviceDetector:
public static IMvcBuilder AddDeviceDetection(this IMvcBuilder builder)
{
builder.Services.AddDeviceSwitcher<UrlSwitcher>(
o => { },
d => {
d.Format = DeviceLocationExpanderFormat.Suffix;
d.MobileCode = "mobile";
d.TabletCode = "tablet";
}
);
return builder;
}
and are adding some route mapping
routes.MapDeviceSwitcher();
We expected to see Index.mobile.cshtml to be picked up when selecting a Phone Emulation in Chrome but that didnt happen.
edit Note:
we're using a combination of Razor Views/MVC (older sections) and Razor Pages (newer sections).
also not every page will have a mobile implementation. That's what would have a IViewLocationExpander solution so great.
edit 2
I think the solution would be the same as how you'd implement Culture specific Razor Pages (which is also unknown to us ;-)). Basic MVC supports Index.en-US.cshtml
Final Solution Below
If this is a Razor Pages application (as opposed to an MVC application) I don't think that the IViewLocationExpander interface is much use to you. As far as I know, it only works for partials, not routeable pages (i.e. those with an #page directive).
What you can do instead is to use Middleware to determine whether the request comes from a mobile device, and then change the file to be executed to one that ends with .mobile. Here's a very rough and ready implementation:
public class MobileDetectionMiddleware
{
private readonly RequestDelegate _next;
public async Task Invoke(HttpContext context)
{
if(context.Request.IsFromAMobileDevice())
{
context.Request.Path = $"{context.Request.Path}.mobile";
}
await _next.Invoke(context);
}
}
It's up to you how you want to implement the IsFromAMobileDevice method to determine the nature of the user agent. There's nothing stopping you using a third party library that can do the check reliably for you. Also, you will probably only want to change the path under certain conditions - such as where there is a device specific version of the requested page.
Register this in your Configure method early:
app.UseMiddleware<MobileDetectionMiddleware>();
I've finally found the way to do it convention based. I have implemented a IViewLocationExpander in order to tackle the device handling for basic Razor Views (including Layouts) and I've implemented IPageRouteModelConvention + IActionConstraint to handle devices for Razor Pages.
Note: this solution only seems to be working on ASP.NET Core 2.2 and up though. For some reason 2.1.x and below is clearing the constraints (tested with a breakpoint in a destructor) after they've been added (can probably be fixed).
Now I can have /Index.mobile.cshtml /Index.desktop.cshtml etc. in both MVC and Razor Pages.
Note: This solution can also be used to implement a language/culture specific Razor Pages (eg. /Index.en-US.cshtml /Index.nl-NL.cshtml)
public class PageDeviceConvention : IPageRouteModelConvention
{
private readonly IDeviceResolver _deviceResolver;
public PageDeviceConvention(IDeviceResolver deviceResolver)
{
_deviceResolver = deviceResolver;
}
public void Apply(PageRouteModel model)
{
var path = model.ViewEnginePath; // contains /Index.mobile
var lastSeparator = path.LastIndexOf('/');
var lastDot = path.LastIndexOf('.', path.Length - 1, path.Length - lastSeparator);
if (lastDot != -1)
{
var name = path.Substring(lastDot + 1);
if (Enum.TryParse<DeviceType>(name, true, out var deviceType))
{
var constraint = new DeviceConstraint(deviceType, _deviceResolver);
for (var i = model.Selectors.Count - 1; i >= 0; --i)
{
var selector = model.Selectors[i];
selector.ActionConstraints.Add(constraint);
var template = selector.AttributeRouteModel.Template;
var tplLastSeparator = template.LastIndexOf('/');
var tplLastDot = template.LastIndexOf('.', template.Length - 1, template.Length - Math.Max(tplLastSeparator, 0));
template = template.Substring(0, tplLastDot); // eg Index.mobile -> Index
selector.AttributeRouteModel.Template = template;
var fileName = template.Substring(tplLastSeparator + 1);
if ("Index".Equals(fileName, StringComparison.OrdinalIgnoreCase))
{
selector.AttributeRouteModel.SuppressLinkGeneration = true;
template = selector.AttributeRouteModel.Template.Substring(0, Math.Max(tplLastSeparator, 0));
model.Selectors.Add(new SelectorModel(selector) { AttributeRouteModel = { Template = template } });
}
}
}
}
}
protected class DeviceConstraint : IActionConstraint
{
private readonly DeviceType _deviceType;
private readonly IDeviceResolver _deviceResolver;
public DeviceConstraint(DeviceType deviceType, IDeviceResolver deviceResolver)
{
_deviceType = deviceType;
_deviceResolver = deviceResolver;
}
public int Order => 0;
public bool Accept(ActionConstraintContext context)
{
return _deviceResolver.GetDeviceType() == _deviceType;
}
}
}
public class DeviceViewLocationExpander : IViewLocationExpander
{
private readonly IDeviceResolver _deviceResolver;
private const string ValueKey = "DeviceType";
public DeviceViewLocationExpander(IDeviceResolver deviceResolver)
{
_deviceResolver = deviceResolver;
}
public void PopulateValues(ViewLocationExpanderContext context)
{
var deviceType = _deviceResolver.GetDeviceType();
if (deviceType != DeviceType.Other)
context.Values[ValueKey] = deviceType.ToString();
}
public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
{
var deviceType = context.Values[ValueKey];
if (!string.IsNullOrEmpty(deviceType))
{
return ExpandHierarchy();
}
return viewLocations;
IEnumerable<string> ExpandHierarchy()
{
var replacement = $"{{0}}.{deviceType}";
foreach (var location in viewLocations)
{
if (location.Contains("{0}"))
yield return location.Replace("{0}", replacement);
yield return location;
}
}
}
}
public interface IDeviceResolver
{
DeviceType GetDeviceType();
}
public class DefaultDeviceResolver : IDeviceResolver
{
public DeviceType GetDeviceType() => DeviceType.Mobile;
}
public enum DeviceType
{
Other,
Mobile,
Tablet,
Normal
}
Startup
services.AddMvc(o => { })
.SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
.AddRazorOptions(o =>
{
o.ViewLocationExpanders.Add(new DeviceViewLocationExpander(new DefaultDeviceResolver()));
})
.AddRazorPagesOptions(o =>
{
o.Conventions.Add(new PageDeviceConvention(new DefaultDeviceResolver()));
});
I want to apply Montserrat-Light font style in all the label and entry, I am doing it by making a renderer of controls. EntryRenderer is working fine but LabelRenderer is giving ArgumentNullException with message: Value can not be null.
[assembly: ExportRenderer(typeof(Label), typeof(ExtendedLabelRenderer))]
namespace NewApp.iOS.Renderer
{
public class ExtendedLabelRenderer : LabelRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
Control.Font = UIFont.FromName("Montserrat-Light", 10f);
}
}
}
}
Try below code. It will update if you haven't specified font-family and size in your XAML. Now you can set in your XAML also.
public class CustomLabelRender : LabelRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
if (Control != null)
{
if (e.NewElement != null)
{
if (!String.IsNullOrEmpty(Element.FontFamily))
Control.Font = UIFont.FromName(this.Element.FontFamily, (nfloat)e.NewElement.FontSize);
}
}
}
}
As an easier approach to this issue, I would like to recommend the Label element and/or the CustomFontEffect of the free, open source Forms9Patch NuGet package. It allows you to store your custom font as an Embedded Resource in your Xamarin.Forms application's cross platform project (.NetStandard, PCL, or Shared Library) and then set that font's Embedded Resource ID as the FontFamily for any Xamarin.Forms element that has the FontFamily property.
var entry = new Xamarin.Forms.Entry {
Text = "Xamarin.Forms.Entry element",
FontFamily = "Forms9PatchDemo.Resources.Fonts.Pacifico.ttf"
};
entry.Effects.Add(Effect.Resolve("Forms9Patch.CustomFontEffect"));
var label = new Forms9Patch.Label
{
Text = "Custom Font Text",
FontFamily = "Forms9PatchDemo.Resources.Fonts.Pacifico.ttf"
}
Full disclosure: I am the author of this package.
I am using Prism 6 with UWP. I have a button in MainPage.xaml which redirect to DashboardPage.xaml. In DashboardPage, I am saving the view state in DashboardPage.xaml.cs :
protected override void SaveState(Dictionary<string, object> pageState)
{
base.SaveState(pageState);
pageState["viewState"] = 123;
}
and saving view model state in DashboardPageViewModel.cs :
public override void OnNavigatingFrom(NavigatingFromEventArgs e, Dictionary<string, object> viewModelState, bool suspending)
{
base.OnNavigatingFrom(e, viewModelState, suspending);
}
[RestorableState]
public string Name
{
get { return _name; }
set { SetProperty(ref _name, value); }
}
By pressing back button from topbar, I went back to MainPage.xaml. After that, when I navigate to DashboardPage.xaml again, I found that view state and view model states are being null. Which means, in the below code of DashboardPage.xaml.cs
protected override void LoadState(object navigationParameter, Dictionary<string, object> pageState)
{
if (pageState == null)
{
return;
}
base.LoadState(navigationParameter, pageState);
if (pageState.ContainsKey("viewState"))
{
var data = pageState["viewState"].ToString();
}
}
pageState is found null.
And, for view model state in DashboardPageViewModel.cs :
public async override void OnNavigatedTo(NavigatedToEventArgs e, Dictionary<string, object> viewModelState)
{
base.OnNavigatedTo(e, viewModelState);
}
viewModelState is null
By pressing back button from topbar, I went back to MainPage.xaml. After that, when I navigate to DashboardPage.xaml again, I found that view state and view model states are being null.
From your posted project. I found that you use NavigationService.Navigate to navigate to DashboardPage. It's right at first time, but after you navigating back to MainPage and again navigate back to DashboardPage. You are also using the NavigationService.Navigate API.
I downloaded Prism's Source Codes and found where the LoadState is called:
protected override void OnNavigatedTo(NavigationEventArgs navigationEventArgs)
{
...
if (navigationEventArgs.NavigationMode == NavigationMode.New)
{
var nextPageKey = _pageKey;
int nextPageIndex = frameFacade.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
// Pass the navigation parameter to the new page
LoadState(navigationEventArgs.Parameter, null);
}
else
{
LoadState(navigationEventArgs.Parameter, (Dictionary<String, Object>)frameState[_pageKey]);
}
}
As you can see, the LoadState is called inside OnNavigatedTo and PageState is passed as argument on condition that the NavigationMode is not New. For ViewModelState it is the similar situation. And for your case, everytime navigating to a page through NavigationService.Navigate will create a totally new page, which means NavigationMode=NavigationMode.New. Therefore PageState and ViewModelState are null.
From the NavigationMode document we can see the NavigationMode.Forward fits your requirement.
So, to fix the problem. The only thing that needs to be done is to modify the OnPageChange method in MainPageViewModel.cs like codes below:
private void OnPageChange()
{
if (_navigationService.CanGoForward())
{
_navigationService.GoForward();
}
else
{
_navigationService.Navigate("Dashboard", null);
}
}