Core Spotlight：セマンティック検索を試みる – その２ (CSUserQuery)

/// Using CSSearchQuery

// Build a query with keywords
func buildQuery(with keywords: [String]) -> String {
    // refer to: 
    // Searching for information in your app | Apple Developer Documentation
    // https://developer.apple.com/documentation/corespotlight/searching-for-information-in-your-app
    let perWordQueries: [String] = keywords.map { word in
        let v = "\"*\(word)*\"c" //大文字小文字を無視
        return "(title == \(v)) || (textContent == \(v)))"
    }
    return perWordQueries.count > 1
        ? "(" + perWordClauses.joined(separator: ") && (") + ")"
        : perWordClauses.first ?? ""
}

let searchQuery = buildQuery(with: keywords)
let context = CSSearchQueryContext()
let query = CSSearchQuery(
    queryString: searchQuery,
    queryContext: context
)
// Event handling
query.foundItemsHandler = { items in ...
query.completionHandler = { error in ...

// Start searching
query.start() 

/// Using CSUserQuery

let context = CSUserQueryContext()
let query = CSUserQuery(
    userQueryString: searchQuery,
    userQueryContext: context
)
for try await element in query.responses {
    switch(element) {
    case .item(let item): 
        // 検索結果に対する処理
    case .suggestion(let suggestion):
        //サジェスト候補に対する処理
    @unknown default: break
    }
}