Hi i easily created custom renderer for Forms Entry control, but when i tried to create one to Picker i get this error:
Error CS0115: `Punteam.iOS.PunteamPickerRederer.OnElementChanged(Xamarin.Forms.Platform.iOS.ElementChangedEventArgs<Xamarin.Forms.Picker>)' is marked as an override but no suitable method found to override (CS0115) (Punteam.iOS)
this is my code on Forms project:
using System;
using Xamarin.Forms;
namespace Punteam
{
public class PunteamPicker : Picker
{
}
}
on IOS Project:
using Xamarin.Forms.Platform.iOS;
using Xamarin.Forms;
using Xamarin.Forms.Platform;
using Punteam;
using Punteam.iOS;
using UIKit;
using EventKitUI;
[assembly: ExportRenderer (typeof(PunteamPicker), typeof(PunteamPickerRederer))]
namespace Punteam.iOS
{
public class PunteamPickerRederer : PunteamPicker
{
protected override void OnElementChanged (ElementChangedEventArgs<Picker> e)
{
/* base.OnElementChanged (e);
this.Control.TextAlignment = MonoTouch.UIKit.UITextAlignment.Center;
this.Control.TextColor = UIColor.White;
this.Control.BackgroundColor = UIColor.Clear;
this.Control.BorderStyle = UITextBorderStyle.RoundedRect;
this.Layer.BorderWidth = 1.0f;
this.Layer.CornerRadius = 4.0f;
this.Layer.MasksToBounds = true;
this.Layer.BorderColor = UIColor.White.CGColor;*/
}
}
}
Any body know's Why i get this error?
public class PunteamPickerRederer : PunteamPicker
should be
public class PunteamPickerRederer : PickerRenderer
Related
I found this class at Centering ProgressBar Programmatically in Android which would display a progressbar programmatically, problem is it's an Xamarin Android Studio example and I'm trying to convert it to Xamarin for Visual Studio 2017. This is the code that I have successfully converted with those lines that I can't seem to find a Xamarin VS 2017 equivalent for.
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
namespace OML_Android
{
class ProgressBarHandler
{
private ProgressBar mProgressBar;
private Context mContext;
public ProgressBarHandler(Context context)
{
mContext = context;
ViewGroup layout = (ViewGroup)((Activity)context).FindViewById(Android.Resource.Id.Content).RootView;
mProgressBar = new ProgressBar(context, null, Android.Resource.Attribute.ProgressBarStyleLarge);
// there is no setIndeterminate method for progressbar
mProgressBar.setIndeterminate(true);
// I cannot find an equivilent for LayoutParams
RelativeLayout.LayoutParams params = RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MatchParent, RelativeLayout.LayoutParams.MatchParent);
RelativeLayout rl = new RelativeLayout(context);
// No equivalent for Gravity.CENTER
rl.SetGravity(Gravity.CENTER);
rl.AddView(mProgressBar);
layout.AddView(rl, params);
hide();
}
public void show()
{
mProgressBar.Visibility = Android.Views.ViewStates.Visible;
}
public void hide()
{
mProgressBar.Visibility = Android.Views.ViewStates.Invisible;
}
}
}
Once I have this converted and working I want it to overlay my logon view until the view finishes processing.
I help you transform Java code to C#, there is running GIF.
There is code.
class ProgressBarHandler
{
private ProgressBar mProgressBar;
private Context mContext;
public ProgressBarHandler(Context context)
{
mContext = context;
ViewGroup layout = (ViewGroup)((Activity)context).FindViewById(Android.Resource.Id.Content).RootView;
mProgressBar = new ProgressBar(context, null, Android.Resource.Attribute.ProgressBarStyleLarge);
// there is no setIndeterminate method for progressbar
// mProgressBar.SetIndeterminate(true);
mProgressBar.Indeterminate = true;
// I cannot find an equivilent for LayoutParams
RelativeLayout.LayoutParams layoutparams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MatchParent, RelativeLayout.LayoutParams.MatchParent);
RelativeLayout rl = new RelativeLayout(context);
// No equivalent for Gravity.CENTER
rl.SetGravity(GravityFlags.Center );
rl.AddView(mProgressBar);
layout.AddView(rl, layoutparams);
hide();
}
public void show()
{
mProgressBar.Visibility = Android.Views.ViewStates.Visible;
}
public void hide()
{
mProgressBar.Visibility = Android.Views.ViewStates.Invisible;
}
}
You can use it directly like following code in Activity.
var progress= new ProgressBarHandler(this);
progress.show();
I am using an image picker in my xamarin forms in order to pick an image from gallery to my program...
But, only in IOS device, when I close the image picker using
imagePicker.DismissModalViewController(true);
all my pop ups that is opened are closed with the imagePicker...
Does someone know why? or how I can solve that?
I am using DependencyService to do that in both
This is the code in IOS project
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Foundation;
using UIKit;
using neoFly_Montana.iOS;
using Xamarin.Forms;
using neoFly_Montana.Interface;
using System.Threading.Tasks;
using System.IO;
[assembly: Dependency(typeof(PicturePickerImplementation))]
namespace neoFly_Montana.iOS
{
public class PicturePickerImplementation : IPicturePicker
{
TaskCompletionSource<Stream> taskCompletionSource;
UIImagePickerController imagePicker;
public Task<Stream> GetImageStreamAsync()
{
// Create and define UIImagePickerController
imagePicker = new UIImagePickerController
{
SourceType = UIImagePickerControllerSourceType.PhotoLibrary,
MediaTypes = UIImagePickerController.AvailableMediaTypes(UIImagePickerControllerSourceType.PhotoLibrary)
};
// Set event handlers
imagePicker.FinishedPickingMedia += OnImagePickerFinishedPickingMedia;
imagePicker.Canceled += OnImagePickerCancelled;
// Present UIImagePickerController;
UIWindow window = UIApplication.SharedApplication.KeyWindow;
var viewController = window.RootViewController;
viewController.PresentModalViewController(imagePicker, true);
// Return Task object
taskCompletionSource = new TaskCompletionSource<Stream>();
return taskCompletionSource.Task;
}
void OnImagePickerFinishedPickingMedia(object sender, UIImagePickerMediaPickedEventArgs args)
{
UIImage image = args.EditedImage ?? args.OriginalImage;
if (image != null)
{
// Convert UIImage to .NET Stream object
NSData data = image.AsJPEG(1);
Stream stream = data.AsStream();
// Set the Stream as the completion of the Task
taskCompletionSource.SetResult(stream);
}
else
{
taskCompletionSource.SetResult(null);
}
imagePicker.DismissModalViewController(true);
}
void OnImagePickerCancelled(object sender, EventArgs args)
{
taskCompletionSource.SetResult(null);
imagePicker.DismissModalViewController(true);
}
}
}
I am using RG.PLUGIN.POPUP
I have created a custom renderer for a WebView in my Xamarin.Forms project. The WebView works great on Android. Unfortunately, on iOS, when the device is rotated, the webpage (any webpage) does not correctly adjust to the new dimensions of the WebView. If I use the built in WebView for Forms, the pages correctly resize on rotate.
What am I doing wrong with my custom renderer?
Below is a stripped down version of my custom renderer (the issue still occurs):
using Xamarin.Forms.Platform.iOS;
using Xamarin.Forms;
using UIKit;
using Foundation;
[assembly: ExportRenderer(typeof(WebView), typeof(MyProject.iOS.WebViewRenderer))]
namespace MyProject.iOS {
public class WebViewRenderer : ViewRenderer<WebView, UIWebView> {
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e) {
if (Control == null) {
var webView = new UIWebView(Frame);
webView.AutoresizingMask = UIViewAutoresizing.All;
SetNativeControl(webView);
webView.LoadRequest(new NSUrlRequest(new NSUrl("http://cnn.com")));
}
}
}
}
To fix the issue, add the following to the custom renderer:
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint) {
return new SizeRequest(Size.Zero, Size.Zero);
}
To fix the rotate problem you need to use the NativeView.Bounds when you create the UIWebView.
[assembly: ExportRenderer(typeof(CustomWebView), typeof(CustomWebViewRenderer))]
namespaceMobile.App.iOS
{
public class CustomWebViewRenderer : ViewRenderer<CustomWebView, UIWebView>
{
protected override void OnElementChanged(ElementChangedEventArgs<CustomWebView> e)
{
base.OnElementChanged(e);
if (Control == null)
{
var webView = new UIWebView(NativeView.Bounds);
webView.ShouldStartLoad += HandleShouldStartLoad;
webView.AutoresizingMask = UIViewAutoresizing.All;
webView.ScalesPageToFit = true;
SetNativeControl(webView);
webView.LoadRequest(new NSUrlRequest(new NSUrl(Element.Url)));
}
}
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
return new SizeRequest(Size.Zero, Size.Zero);
}
}
}
I'm using Mono-For-Droid. I have an ImageView and want to move it to follow my finger when I touch it and stop moving when I release my finger.
Here is my code, please advice how do it?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Util;
using Android.Graphics.Drawables;
using Android.Content.Res;
[assembly: UsesPermission(Name = Android.Manifest.Permission.SystemAlertWindow)]
namespace ExtremeKeyboard
{
[Service]
public class ChatheadService: Android.App.Service
{
System.Threading.Timer _timer;
private IWindowManager windowManager;
private ImageView ReminderHead;
private Drawable icon;
private Android.Views.WindowManagerLayoutParams LOParams;
public override void OnStart(Android.Content.Intent intent, int startId)
{
base.OnStart(intent, startId);
var windowService = this.GetSystemService(Android.Content.Context.WindowService);
var windowManager = windowService.JavaCast<Android.Views.IWindowManager>();
ReminderHead = new ImageView(this);
ReminderHead.SetImageResource(Resource.Drawable.Icon);
LOParams = new Android.Views.WindowManagerLayoutParams(
Android.Views.WindowManagerLayoutParams.WrapContent,
Android.Views.WindowManagerLayoutParams.WrapContent,
Android.Views.WindowManagerTypes.Phone,
Android.Views.WindowManagerFlags.NotFocusable,
Android.Graphics.Format.Translucent);
LOParams.Gravity = GravityFlags.Top | GravityFlags.Left;
LOParams.X = 0;
LOParams.Y = 100;
windowManager.AddView(ReminderHead, LOParams);
}
public override Android.OS.IBinder OnBind(Android.Content.Intent intent)
{
throw new NotImplementedException();
}
}
}
I`m developing for a Intermec handheld device CK30 with a 2D reader in C# compact framework 2.0 (windows mobile 6.1).
Everytime I use barcode mey keyboard stops working. Any ideas why?
Heres the code. The first section is a class that configures the barcode reader. The second section is a form that uses the barcode reader to fill a textbox.
After reading something with the barcode reader the keyboard stops working...
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using Intermec.DataCollection;
namespace BarCodeReaderTest
{
class LeitorCodigoDeBarras
{
public BarcodeReader LerCodigoDeBarras()
{
try
{
BarcodeReader meuLeitor = new BarcodeReader("default", 4096);
meuLeitor.ScannerEnable = true;
meuLeitor.ThreadedRead(true);
return meuLeitor;
}
catch (BarcodeReaderException bx)
{
MessageBox.Show("Não foi possível inicializar o leitor de código de barras. Contate seu supervisor. \n" + bx.Message);
return null;
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Intermec.DataCollection;
namespace BarCodeReaderTest
{
public partial class Form1 : Form
{
public BarcodeReader leitor;
public Form1()
{
InitializeComponent();
LeitorCodigoDeBarras classeLeitor = new LeitorCodigoDeBarras();
leitor = classeLeitor.LerCodigoDeBarras();
leitor.BarcodeRead += new BarcodeReadEventHandler(this.eventoLeitorCodigoDeBarras);
}
void eventoLeitorCodigoDeBarras(object sender, BarcodeReadEventArgs e)
{
tbCodLido.Text = e.strDataBuffer;
}
}
}
OK, I now relaized that you are using the BarcodeReader within a separate class.
Please try the follwing, standard, example (one listbox and one button in form):
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Intermec.DataCollection;
namespace BarcodeReader
{
public partial class Form1 : Form
{
private Intermec.DataCollection.BarcodeReader bcr;
public Form1()
{
InitializeComponent();
bcr = new Intermec.DataCollection.BarcodeReader();
bcr.BarcodeRead += new BarcodeReadEventHandler(bcr_BarcodeRead);
bcr.ThreadedRead(true);
}
void bcr_BarcodeRead(object sender, BarcodeReadEventArgs bre)
{
this.listBox1.Items.Add(bre.strDataBuffer);
}
}
private void btnExit_Click(object sender, EventArgs e)
{
if (bcr !=null)
{
bcr.Dispose();
}
Application.Exit();
}
}
If that works (see also the examples coming with the Intermec Datacollection resource kit), we can examine, why you construct does not work. I assume you have the latest DataCollection Resource Kit installed.