如何在 .NET MAUI 中在 iOS 上读取和写入条形码
.NET MAUI(多平台应用程序用户界面)构建于Xamarin.Forms之上,提供了一个统一的框架,用于使用.NET开发跨平台应用程序。 它使开发人员能够创建在 Android、iOS、macOS 和 Windows 上无缝运行的本地主界面,简化了应用程序开发过程。
BarCode.iOS package 为 iOS 提供条形码支持!!
如何在 .NET MAUI 中在 iOS 上读取和写入条形码
IronBarcode iOS 包
BarCode.iOS 包通过 .NET 跨平台项目在 iOS 设备上实现条形码功能。 不需要原始的BarCode包。
PM > Install-Package BarCode.iOS
使用 NuGet 安装
Install-Package BarCode.iOS
创建一个.NET MAUI项目
在多平台部分中,选择 .NET MAUI App 并继续。
包括BarCode.iOS库
可以通过多种方式添加库。 或许使用 NuGet 是最简单的方式。
在 Visual Studio 中,右键单击“依赖项 > NuGet”,然后选择“管理 NuGet 包...”。
选择“浏览”选项卡并搜索“BarCode.iOS”。
选择“BarCode.iOS”包并点击“添加包”。
为了防止与其他平台发生问题,在针对 iOS 平台进行目标设置时,修改 csproj 文件以仅包含该包。 为了做到这一点:
右键单击项目的 *.csproj 文件,然后选择“编辑项目文件”。
- 创建一个新的 ItemGroup 元素,如下所示:
<ItemGroup Condition="$(TargetFramework.Contains('ios')) == true">
<PackageReference Include="BarCode.iOS" Version="2025.3.4" />
</ItemGroup>
将 "BarCode.iOS" 的 PackageReference 移动到我们刚刚创建的 ItemGroup 内。
上述步骤将防止在诸如Android等平台上使用“BarCode.iOS”软件包。 为此,请改为安装BarCode.Android。
设计应用程序界面
修改XAML文件以接受用于生成条形码和QR码的输入值。 还包括一个按钮以选择文档来读取条形码。 下面是一个例子:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="IronBarcodeMauiIOS.MainPage">
<VerticalStackLayout Padding="20">
<HorizontalStackLayout>
<CheckBox x:Name="generatePdfCheckBox" IsChecked="{Binding IsGeneratePdfChecked}" />
<Label Text="PDF (unchecked for PNG)" VerticalOptions="Center"/>
</HorizontalStackLayout>
<Entry x:Name="barcodeInput" Placeholder="Enter barcode value..." />
<Button Text="Generate and save barcode" Clicked="WriteBarcode" />
<Entry x:Name="qrInput" Placeholder="Enter QR code value..." />
<Button Text="Generate and save QR code" Clicked="WriteQRcode" />
<Button
Text="Read Barcode"
Clicked="ReadBarcode"
Grid.Row="0"
HorizontalOptions="Center"
Margin="20, 20, 20, 10"/>
<ScrollView
Grid.Row="1"
BackgroundColor="LightGray"
Padding="10"
Margin="10, 10, 10, 30">
<Label x:Name="OutputText"/>
</ScrollView>
</VerticalStackLayout>
</ContentPage>
读取和写入条形码
从上述 MainPage.xaml 代码中,我们可以看到复选框决定生成的条形码和二维码是否应为 PDF 格式。 接下来,我们设置许可证密钥。 请在此步骤中使用试用版或付费版许可证密钥。
代码检查并检索barcodeInput变量的值,然后使用CreateBarcode
方法生成条形码。 最后,它调用SaveToDownloadsAsync
方法,该方法能够在Android和iOS上正确保存文件。
在 iOS 上,导出文档到 文件 应用程序需要自定义文件路径。
using IronBarCode;
namespace IronBarcodeMauiIOS;
public partial class MainPage : ContentPage
{
public bool IsGeneratePdfChecked
{
get => generatePdfCheckBox.IsChecked;
set
{
generatePdfCheckBox.IsChecked = value;
}
}
public MainPage()
{
InitializeComponent();
IronBarCode.License.LicenseKey = "IRONBARCODE-MYLICENSE-KEY-1EF01";
}
private async void WriteBarcode(object sender, EventArgs e)
{
try
{
if (!string.IsNullOrEmpty(barcodeInput.Text))
{
var barcode = BarcodeWriter.CreateBarcode(barcodeInput.Text, BarcodeEncoding.EAN13);
// Generate file name
string fileExtension = IsGeneratePdfChecked ? "pdf" : "png";
string fileName = $"Barcode_{DateTime.Now:yyyyMMddHHmmss}.{fileExtension}";
byte[] fileData = IsGeneratePdfChecked ? barcode.ToPdfBinaryData() : barcode.ToPngBinaryData();
// Get file saver instance and save the file to the Downloads folder (or Documents on iOS)
await SaveToDownloadsAsync(fileData, fileName);
}
}
catch (Exception ex)
{
// Handle exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
private async void WriteQRcode(object sender, EventArgs e)
{
try
{
if (!string.IsNullOrEmpty(qrInput.Text))
{
var barcode = QRCodeWriter.CreateQrCode(qrInput.Text);
// Generate file name
string fileExtension = IsGeneratePdfChecked ? "pdf" : "png";
string fileName = $"QRcode_{DateTime.Now:yyyyMMddHHmmss}.{fileExtension}";
byte[] fileData = IsGeneratePdfChecked ? barcode.ToPdfBinaryData() : barcode.ToPngBinaryData();
// Get file saver instance and save the file to the Downloads folder (or Documents on iOS)
await SaveToDownloadsAsync(fileData, fileName);
}
}
catch (Exception ex)
{
// Handle exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
private async void ReadBarcode(object sender, EventArgs e)
{
try
{
var options = new PickOptions
{
PickerTitle = "Please select a file"
};
var file = await FilePicker.PickAsync(options);
OutputText.Text = "";
if (file != null)
{
using var stream = await file.OpenReadAsync();
BarcodeResults result;
if (file.ContentType.Contains("pdf"))
{
result = BarcodeReader.ReadPdf(stream);
}
else
{
result = BarcodeReader.Read(stream);
}
string barcodeResult = "";
int count = 1;
result.ForEach(x => { barcodeResult += $"barcode {count}: {x.Value}\n"; count++; });
OutputText.Text = barcodeResult;
}
}
catch (Exception ex)
{
// Handle exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
public async Task SaveToDownloadsAsync(byte[] fileData, string fileName)
{
#if IOS
// Define the custom path you want to save to
var customPath = "/Users/Iron/Library/Developer/CoreSimulator/Devices/7D1F57F2-1103-46DA-AEE7-C8FC871502F5/data/Containers/Shared/AppGroup/37CD82C0-FCFC-45C7-94BB-FFEEF7BAFF13/File Provider Storage/Document";
// Combine the custom path with the file name
var filePath = Path.Combine(customPath, fileName);
try
{
// Create the directory if it doesn't exist
if (!Directory.Exists(customPath))
{
Directory.CreateDirectory(customPath);
}
// Save the file to the specified path
await File.WriteAllBytesAsync(filePath, fileData);
// Display a success message
await Application.Current.MainPage.DisplayAlert("Saved", $"File saved to {filePath}", "OK");
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Error saving file: " + ex.Message);
}
#endif
}
}
using IronBarCode;
namespace IronBarcodeMauiIOS;
public partial class MainPage : ContentPage
{
public bool IsGeneratePdfChecked
{
get => generatePdfCheckBox.IsChecked;
set
{
generatePdfCheckBox.IsChecked = value;
}
}
public MainPage()
{
InitializeComponent();
IronBarCode.License.LicenseKey = "IRONBARCODE-MYLICENSE-KEY-1EF01";
}
private async void WriteBarcode(object sender, EventArgs e)
{
try
{
if (!string.IsNullOrEmpty(barcodeInput.Text))
{
var barcode = BarcodeWriter.CreateBarcode(barcodeInput.Text, BarcodeEncoding.EAN13);
// Generate file name
string fileExtension = IsGeneratePdfChecked ? "pdf" : "png";
string fileName = $"Barcode_{DateTime.Now:yyyyMMddHHmmss}.{fileExtension}";
byte[] fileData = IsGeneratePdfChecked ? barcode.ToPdfBinaryData() : barcode.ToPngBinaryData();
// Get file saver instance and save the file to the Downloads folder (or Documents on iOS)
await SaveToDownloadsAsync(fileData, fileName);
}
}
catch (Exception ex)
{
// Handle exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
private async void WriteQRcode(object sender, EventArgs e)
{
try
{
if (!string.IsNullOrEmpty(qrInput.Text))
{
var barcode = QRCodeWriter.CreateQrCode(qrInput.Text);
// Generate file name
string fileExtension = IsGeneratePdfChecked ? "pdf" : "png";
string fileName = $"QRcode_{DateTime.Now:yyyyMMddHHmmss}.{fileExtension}";
byte[] fileData = IsGeneratePdfChecked ? barcode.ToPdfBinaryData() : barcode.ToPngBinaryData();
// Get file saver instance and save the file to the Downloads folder (or Documents on iOS)
await SaveToDownloadsAsync(fileData, fileName);
}
}
catch (Exception ex)
{
// Handle exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
private async void ReadBarcode(object sender, EventArgs e)
{
try
{
var options = new PickOptions
{
PickerTitle = "Please select a file"
};
var file = await FilePicker.PickAsync(options);
OutputText.Text = "";
if (file != null)
{
using var stream = await file.OpenReadAsync();
BarcodeResults result;
if (file.ContentType.Contains("pdf"))
{
result = BarcodeReader.ReadPdf(stream);
}
else
{
result = BarcodeReader.Read(stream);
}
string barcodeResult = "";
int count = 1;
result.ForEach(x => { barcodeResult += $"barcode {count}: {x.Value}\n"; count++; });
OutputText.Text = barcodeResult;
}
}
catch (Exception ex)
{
// Handle exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
public async Task SaveToDownloadsAsync(byte[] fileData, string fileName)
{
#if IOS
// Define the custom path you want to save to
var customPath = "/Users/Iron/Library/Developer/CoreSimulator/Devices/7D1F57F2-1103-46DA-AEE7-C8FC871502F5/data/Containers/Shared/AppGroup/37CD82C0-FCFC-45C7-94BB-FFEEF7BAFF13/File Provider Storage/Document";
// Combine the custom path with the file name
var filePath = Path.Combine(customPath, fileName);
try
{
// Create the directory if it doesn't exist
if (!Directory.Exists(customPath))
{
Directory.CreateDirectory(customPath);
}
// Save the file to the specified path
await File.WriteAllBytesAsync(filePath, fileData);
// Display a success message
await Application.Current.MainPage.DisplayAlert("Saved", $"File saved to {filePath}", "OK");
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Error saving file: " + ex.Message);
}
#endif
}
}
Imports Microsoft.VisualBasic
Imports IronBarCode
Namespace IronBarcodeMauiIOS
Partial Public Class MainPage
Inherits ContentPage
Public Property IsGeneratePdfChecked() As Boolean
Get
Return generatePdfCheckBox.IsChecked
End Get
Set(ByVal value As Boolean)
generatePdfCheckBox.IsChecked = value
End Set
End Property
Public Sub New()
InitializeComponent()
IronBarCode.License.LicenseKey = "IRONBARCODE-MYLICENSE-KEY-1EF01"
End Sub
Private Async Sub WriteBarcode(ByVal sender As Object, ByVal e As EventArgs)
Try
If Not String.IsNullOrEmpty(barcodeInput.Text) Then
Dim barcode = BarcodeWriter.CreateBarcode(barcodeInput.Text, BarcodeEncoding.EAN13)
' Generate file name
Dim fileExtension As String = If(IsGeneratePdfChecked, "pdf", "png")
Dim fileName As String = $"Barcode_{DateTime.Now:yyyyMMddHHmmss}.{fileExtension}"
Dim fileData() As Byte = If(IsGeneratePdfChecked, barcode.ToPdfBinaryData(), barcode.ToPngBinaryData())
' Get file saver instance and save the file to the Downloads folder (or Documents on iOS)
Await SaveToDownloadsAsync(fileData, fileName)
End If
Catch ex As Exception
' Handle exceptions
System.Diagnostics.Debug.WriteLine(ex)
End Try
End Sub
Private Async Sub WriteQRcode(ByVal sender As Object, ByVal e As EventArgs)
Try
If Not String.IsNullOrEmpty(qrInput.Text) Then
Dim barcode = QRCodeWriter.CreateQrCode(qrInput.Text)
' Generate file name
Dim fileExtension As String = If(IsGeneratePdfChecked, "pdf", "png")
Dim fileName As String = $"QRcode_{DateTime.Now:yyyyMMddHHmmss}.{fileExtension}"
Dim fileData() As Byte = If(IsGeneratePdfChecked, barcode.ToPdfBinaryData(), barcode.ToPngBinaryData())
' Get file saver instance and save the file to the Downloads folder (or Documents on iOS)
Await SaveToDownloadsAsync(fileData, fileName)
End If
Catch ex As Exception
' Handle exceptions
System.Diagnostics.Debug.WriteLine(ex)
End Try
End Sub
Private Async Sub ReadBarcode(ByVal sender As Object, ByVal e As EventArgs)
Try
Dim options = New PickOptions With {.PickerTitle = "Please select a file"}
Dim file = Await FilePicker.PickAsync(options)
OutputText.Text = ""
If file IsNot Nothing Then
Dim stream = Await file.OpenReadAsync()
Dim result As BarcodeResults
If file.ContentType.Contains("pdf") Then
result = BarcodeReader.ReadPdf(stream)
Else
result = BarcodeReader.Read(stream)
End If
Dim barcodeResult As String = ""
Dim count As Integer = 1
result.ForEach(Sub(x)
barcodeResult &= $"barcode {count}: {x.Value}" & vbLf
count += 1
End Sub)
OutputText.Text = barcodeResult
End If
Catch ex As Exception
' Handle exceptions
System.Diagnostics.Debug.WriteLine(ex)
End Try
End Sub
Public Async Function SaveToDownloadsAsync(ByVal fileData() As Byte, ByVal fileName As String) As Task
#If IOS Then
' Define the custom path you want to save to
Dim customPath = "/Users/Iron/Library/Developer/CoreSimulator/Devices/7D1F57F2-1103-46DA-AEE7-C8FC871502F5/data/Containers/Shared/AppGroup/37CD82C0-FCFC-45C7-94BB-FFEEF7BAFF13/File Provider Storage/Document"
' Combine the custom path with the file name
Dim filePath = Path.Combine(customPath, fileName)
Try
' Create the directory if it doesn't exist
If Not Directory.Exists(customPath) Then
Directory.CreateDirectory(customPath)
End If
' Save the file to the specified path
Await File.WriteAllBytesAsync(filePath, fileData)
' Display a success message
Await Application.Current.MainPage.DisplayAlert("Saved", $"File saved to {filePath}", "OK")
Catch ex As Exception
System.Diagnostics.Debug.WriteLine("Error saving file: " & ex.Message)
End Try
#End If
End Function
End Class
End Namespace
最后,将构建目标切换为 iOS 模拟器并运行项目。
运行项目
这将向您展示如何运行项目并使用条形码功能。

下载 .NET MAUI 应用程序项目
您可以下载本指南的完整代码。它以压缩文件的形式提供,您可以将其作为.NET MAUI App项目在Visual Studio中打开。