在Xamarin iOS中打开相机时出现白屏

Question

通过zxing打开相机进行二维码扫描时，如果正确扫描二维码却显示白屏，则会出现相机白屏？

这是我的代码：

namespace Kefi.Controls
{
    public class CustomScanPage : ContentPage
    {
        ZXingScannerView zxing;
        public CustomScanPage() : base()
        {
            zxing = new ZXingScannerView
            {
                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.Center

            };
            NavigationPage.SetHasNavigationBar(this,false);
            zxing.OnScanResult += (result) =>
                Device.BeginInvokeOnMainThread(() =>
                {
                    zxing.IsAnalyzing = false;
                    zxing.IsScanning = false;
                    MessagingCenter.Send(result, "Scanresult");
                });
            var grid = new Grid
            {
                VerticalOptions = LayoutOptions.FillAndExpand,
                HorizontalOptions = LayoutOptions.FillAndExpand,
            };
        }
        protected  override void OnAppearing()
        {
            base.OnAppearing();
            zxing.Options.DelayBetweenAnalyzingFrames = 5;
            zxing.Options.DelayBetweenContinuousScans = 5;
            zxing.IsScanning = true;

        }

        protected override void OnDisappearing()
        {
            zxing.IsScanning = false;
            base.OnDisappearing();
        }

    }
}

Answer 1

您甚至没有将scannerView添加到contentPage，因此不会显示。添加一个简单的StackLayout来容纳scannerView，然后将其设置为Content的{​​{1}}：

ContentPage

或者您可以自定义xaml中的ScannerView，请在此处查看博客：scanning-generating-barcodes-zxing

让我知道它是否对您有用。