Swift - 如何使用 UISearchController 过滤多个关键字

Question

我有一个 UISearchController，当用户输入文本时，它会搜索对象。但是用户只能搜索一个关键字，我希望他们搜索多个关键字。

型号：

struct DiagnosisDetails: Codable {
    let diagnosisCodeId: Int
    let diagnosisMappingId: Int
    let diagnosisCode: String?
    let bodyRegion: String?
    let bodyPart: String?
    let bodySite: String?
}

搜索代码

 func filteredDiagnosis(for queryOrNil: String?) -> [DiagnosisDetails] {
        guard let diagnosis = self.diagnosis, let query = queryOrNil, !query.isEmpty else { return [] }
        
        let filteredDiagnosis: [DiagnosisDetails] = diagnosis.filter {
            if let bodyPart = $0.bodyPart,
               let bodySite = $0.bodySite,
               let bodyRegion = $0.bodyRegion,
               let diagnosisCode = $0.diagnosisCode {
                return (bodyPart.lowercased().contains(query.lowercased()) || bodySite.lowercased().contains(query.lowercased()) || bodyRegion.lowercased().contains(query.lowercased()) || diagnosisCode.lowercased().contains(query.lowercased()))
            } else {
                return false
            }
        }
        return filteredDiagnosis
    }

如何让用户搜索多个关键字？

Answer 1

您可以通过创建要查询的诊断字段的帮助字符串来简化搜索逻辑，然后找到与之匹配的任何子字符串。

首先，创建从诊断返回“主搜索字符串”的函数：

struct DiagnosisDetails: Codable, Hashable {
    let diagnosisCodeId: Int
    let diagnosisMappingId: Int
    let diagnosisCode: String?
    let bodyRegion: String?
    let bodyPart: String?
    let bodySite: String?

    func getSearchString() -> String {
        let bPart = bodyPart ?? ""
        let bSite = bodySite ?? ""
        let bRegion = bodyRegion ?? ""
        let dCode = diagnosisCode ?? ""
        return bPart + bSite + bRegion + dCode
    }
}

那么简单的搜索功能如下：

func filteredDiagnosis(for queryOrNil: String?) -> [DiagnosisDetails] {
    guard let diagnosis = self.diagnosis, let query = queryOrNil, !query.isEmpty else { return [] }

    return diagnosis.filter({
        return $0.getSearchString().range(of: query, options: .caseInsensitive) != nil
    })
} 

---

UPD 多词搜索字符串的过滤功能：思路很简单——将搜索查询拆分为词，为每个匹配的词过滤诊断数组，并使用集合组合所有答案

func filteredDiagnosis(for queryOrNil: String?) -> [DiagnosisDetails] {
    guard let diagnosis = self.diagnosis, let query = queryOrNil, !query.isEmpty else { return [] }

    let searchWords = query.components(separatedBy: " ").filter({$0 != ""})
    var filterResults = Set<DiagnosisDetails>()

    for word in searchWords {
        let wordResult = diagnosis.filter {$0.getSearchString().range(of: word, options: .caseInsensitive) != nil}
        for res in wordResult { filterResults.insert(res) }
    }

    return Array(filterResults)
}