Xcode调试异常：变量列表可见imageURL却提示不在作用域

调试过程中执行po imageURL命令时，Xcode调试器报错：cannot find 'imageURL' in scope，但imageURL明确显示在变量列表中（截图显示变量列表里存在该变量，但po命令执行失败）。

同样的问题也出现在if语句块内定义的holdCountString、copyCountString、isbn、upc等变量上。

已尝试的排查操作：

• 清理构建文件夹
• 清除Xcode缓存
• 重启电脑及Xcode

但以上操作均未解决问题，调试器仍提示变量不在作用域。

相关代码 #

核心处理函数 #

static func newSearchResult(from record: SwiftSoup.Element) async throws -> SearchResult? {
    let title = try record.select(CSSSelector.title.rawValue).text()
    let author = try record.select(CSSSelector.author.rawValue).text()
    
    let typeString = try record.select(CSSSelector.type.rawValue).text()
    let type = ItemType(rawValue: typeString)
    
    if type == nil {
        return nil
    }
    
    var releaseYear = try record.select(CSSSelector.releaseYear.rawValue).text()
    if releaseYear.last == "." { releaseYear.removeLast() }
    
    let description = try record.select(CSSSelector.description.rawValue).text()
    let itemRelativePath = try record.select(CSSSelector.itemRelativePath.rawValue).attr(AttributeKey.href.rawValue)
    
    var holdCount = 0
    var copyCount = 0
    
    var imageURL: URL? = nil
    let sizeCode = try record.select(CSSSelector.mainImage.rawValue).attr(AttributeKey.imageSizeCode.rawValue)
    
    if type == .ebook {
        let overdriveID = try record.select(CSSSelector.overdriveImage.rawValue).attr(AttributeKey.overdriveID.rawValue)
        
        let availability = try await overdriveAvailability(forID: overdriveID)
        holdCount = availability.holdCount
        copyCount = availability.copyCount
        
        let overdriveImage = try await overdriveCoverImage(forID: overdriveID)
        imageURL = URL(string: overdriveImage.src)
        
    } else if type != .elearning && type != .evideo {
        let holdCountString = try record.select(CSSSelector.holdCount.rawValue).text()
        if holdCountString != "" { holdCount = Int(holdCountString.split(separator: " ")[0])! }
        
        let copyCountString = try record.select(CSSSelector.copyCount.rawValue).text()
        if copyCountString != "" { copyCount = Int(copyCountString.split(separator: " ")[0])! }
        
        let isbn = try record.select(CSSSelector.mainImage.rawValue).attr(AttributeKey.isbn.rawValue)
        let upc = try record.select(CSSSelector.mainImage.rawValue).attr(AttributeKey.upc.rawValue)
        
        imageURL = TPLAPI.syndeticsImageURL(usingISBN: isbn, orUPC: upc, withSizeCode: sizeCode)
    }
    
    return SearchResult(
        imageURL: imageURL, title: title, author: author,
        type: type!, releaseYear: releaseYear,
        description: description, copyCount: copyCount,
        holdCount: holdCount, itemRelativePath: itemRelativePath
    )
}

newSearchResult(from:)是异步函数，被异步函数searchResults(for:)调用，后者负责下载HTML文件，通过SwiftSoup提取搜索结果容器元素后，调用该函数处理每个元素。

视图调用代码 #

.onSubmit {
    Task {
        do {
            showProgressView.toggle()
                            
            print("task started running for input: \(input)")
                            
            searchResults = try await TPLAPI.searchResults(for: input)
            showProgressView.toggle()
        } catch {
            print(error.localizedDescription)
        }
    }
}

内容的提问来源于stack exchange，提问作者mediter