我有一个问题,如何将我的堆叠布局中的海牛条码扫描器与特定测量结合起来......这是我的代码图片......
这是我的代码实际代码......请帮帮我......
select DATEADD(DAY,
DATEPART(DAY,(MIN([Actual Date]))) - DATEPART(DAY,(MAX([Payment Date]))),
DATEADD(MONTH,
( 11 - COUNT(*) )
, MAX([Payment Date])) )
from @InstalmentTable
答案 0 :(得分:0)
您需要使用ViewRenderer并在页面中包含该视图。 https://developer.xamarin.com/guides/xamarin-forms/application-fundamentals/custom-renderer/view/
此应用程序中https://github.com/manateeworks/xamarin-shopping-cart-demo-app扫描程序实现为页面。进行更改并将PageRenderer转换为ViewRenderer。
也可以在本机ViewRenderer中使用scanner.ScanInView而不是scanner.ScanWithCallback。以下是Droid原生ViewRenderer的代码部分
[assembly: ExportRenderer(typeof(ManateeShoppingCart.CameraPreview), typeof(ManateeShoppingCart.Droid.ScanPageRenderer))]
namespace ManateeShoppingCart.Droid
{
public class ScanPageRenderer : ViewRenderer, IScanSuccessCallback
{
Scanner scanner;
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.View> e)
{
base.OnElementChanged(e);
if (e.OldElement != null || Element == null)
{
return;
}
scanner = new Scanner(Forms.Context);
scanner.setInterfaceOrientation("All");
scanner.closeScannerOnDecode = false;
customDecoderInit();
double screenHeight = App.Current.MainPage.Height > App.Current.MainPage.Width ? App.Current.MainPage.Height : App.Current.MainPage.Width;
double screenWidth = App.Current.MainPage.Height < App.Current.MainPage.Width ? App.Current.MainPage.Height : App.Current.MainPage.Width; ;
float preivewX = (float)((CameraPreview)Element).CameraPreviewX;
float preivewY = (float)((CameraPreview)Element).CameraPreviewY;
float previewWidth = (float)((CameraPreview)Element).CameraPreviewWidth;
float previewHeight = (float)((CameraPreview)Element).CameraPreviewHeight;
scanner.ScanInView(this, new RectangleF((float)(preivewX / screenWidth) * 100, (float)(preivewY / screenHeight) * 100, (float)(previewWidth / screenWidth) * 100, (float)(previewHeight / screenHeight) * 100));
}
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