在xamarin ios中打开摄像头时出现白屏
在xamarin ios中打开摄像头时出现白屏
提问于 2019-07-03 19:26:41
当通过zxing打开摄像头进行二维码扫描时，当它正确扫描二维码时，会出现白屏而不是白屏？
下面是我的代码：
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();
}
}
}回答 1
Stack Overflow用户
发布于 2019-07-04 15:18:49
您甚至没有将scannerView添加到contentPage，所以它不会显示。添加一个简单的StackLayout来保存scannerView，然后将其设置为ContentPage的Content
public CustomScanPage()
{
zxing = new ZXingScannerView
{
HorizontalOptions = LayoutOptions.CenterAndExpand,
VerticalOptions = LayoutOptions.CenterAndExpand,
BackgroundColor = Color.Orange
};
NavigationPage.SetHasNavigationBar(this, false);
zxing.OnScanResult += (result) =>
Device.BeginInvokeOnMainThread(() =>
{
zxing.IsAnalyzing = false;
zxing.IsScanning = false;
MessagingCenter.Send(result, "Scanresult");
});
var layout = new StackLayout();
layout.BackgroundColor = Color.Red;
layout.Children.Add(zxing);
Content = zxing;
}或者，您也可以在xaml中自定义scannerView，请参阅此处的博客：scanning-generating-barcodes-zxing
如果它对你有效，请让我知道。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56869079
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