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import SwiftUI
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import CoreImage
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import CoreImage.CIFilterBuiltins
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// MARK: - 条形码预览组件
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struct BarcodePreviewView: View {
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let content: String
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let barcodeType: BarcodeType
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var body: some View {
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Group {
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if let barcodeImage = generateBarcodeImage() {
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Image(uiImage: barcodeImage)
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.resizable()
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.aspectRatio(contentMode: .fit)
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.frame(maxWidth: .infinity)
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.background(Color.white)
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.cornerRadius(8)
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.shadow(color: .black.opacity(0.1), radius: 2, x: 0, y: 1)
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} else {
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// 生成失败时的占位符
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VStack(spacing: 8) {
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Image(systemName: "barcode.viewfinder")
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.font(.system(size: 32))
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.foregroundColor(.gray)
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Text("无法生成条形码")
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.font(.caption)
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.foregroundColor(.gray)
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Text("请检查输入内容格式")
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.font(.caption2)
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.foregroundColor(.gray)
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}
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.frame(maxWidth: .infinity)
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.frame(height: 120)
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.background(Color(.systemGray5))
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.cornerRadius(8)
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}
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}
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}
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// MARK: - 生成条形码图片
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private func generateBarcodeImage() -> UIImage? {
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guard !content.isEmpty else { return nil }
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let context = CIContext()
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let filter: CIFilter?
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// 根据条形码类型选择相应的滤镜
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switch barcodeType {
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case .ean13, .ean8, .upce, .itf14:
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filter = CIFilter.code128BarcodeGenerator()
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filter?.setValue(content.data(using: .utf8), forKey: "inputMessage")
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case .code39:
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// Code 39 使用 Code 128 滤镜，因为 Core Image 不直接支持 Code 39
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filter = CIFilter.code128BarcodeGenerator()
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filter?.setValue(content.data(using: .utf8), forKey: "inputMessage")
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case .code128:
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filter = CIFilter.code128BarcodeGenerator()
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filter?.setValue(content.data(using: .utf8), forKey: "inputMessage")
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case .pdf417:
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filter = CIFilter.pdf417BarcodeGenerator()
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filter?.setValue(content.data(using: .utf8), forKey: "inputMessage")
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}
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guard let filter = filter,
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let outputImage = filter.outputImage else { return nil }
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// 设置条形码的尺寸和缩放
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let scale = CGAffineTransform(scaleX: 3, y: 3)
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let scaledImage = outputImage.transformed(by: scale)
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// 转换为UIImage
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guard let cgImage = context.createCGImage(scaledImage, from: scaledImage.extent) else {
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return nil
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}
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return UIImage(cgImage: cgImage)
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}
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}
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#Preview {
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VStack(spacing: 20) {
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BarcodePreviewView(content: "1234567890123", barcodeType: .ean13)
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BarcodePreviewView(content: "12345678", barcodeType: .ean8)
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BarcodePreviewView(content: "CODE39", barcodeType: .code39)
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BarcodePreviewView(content: "123456789012345678901234567890", barcodeType: .pdf417)
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}
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.padding()
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} |
