44 lines
1.7 KiB
Swift
44 lines
1.7 KiB
Swift
import AppKit
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import SwiftUI
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/// 国旗：使用包内由 flag-icons（MIT）渲染好的 PNG，不使用 emoji。
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/// 不直接读 SVG：系统的 SVG 渲染器对嵌套 <use> 等写法支持不好，中国、乌兹别克斯坦等旗子会画错（见 scripts/render_flags.sh）
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struct FlagImage: View {
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let countryCode: String
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var height: CGFloat = DS.Space.s3
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var body: some View {
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if let image = FlagCache.shared.image(for: countryCode) {
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Image(nsImage: image)
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.resizable()
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.aspectRatio(4 / 3, contentMode: .fit)
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.frame(height: height)
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.clipShape(RoundedRectangle(cornerRadius: DS.Radius.sm / 2))
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.overlay(RoundedRectangle(cornerRadius: DS.Radius.sm / 2).strokeBorder(DS.Palette.border, lineWidth: DS.Size.stroke))
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.accessibilityHidden(true)
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}
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}
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}
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@MainActor
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final class FlagCache {
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static let shared = FlagCache()
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private var images: [String: NSImage] = [:]
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private var missing: Set<String> = []
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func image(for countryCode: String) -> NSImage? {
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let code = countryCode.lowercased()
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// 只接受两位字母，避免拼出包外路径
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guard code.count == 2, code.unicodeScalars.allSatisfy({ ("a"..."z").contains($0) }) else { return nil }
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if let image = images[code] { return image }
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guard !missing.contains(code) else { return nil }
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guard let url = Bundle.module.url(forResource: code, withExtension: "png", subdirectory: "Flags"),
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let image = NSImage(contentsOf: url) else {
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missing.insert(code)
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return nil
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}
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images[code] = image
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return image
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}
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}
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