使用不区分大小写的搜索过滤字典

Question

这是关于如何Filter a Dictionary 的后续问题，只有我需要过滤器不区分大小写

我有一本在 Swift 3 中填充 Pickerview 的字典。

var facilityDict:       [Int: [String: String]] = [:]

17: ["id": "199", "facilitycode": "036", "location_name": "中心点 医务室"],
41：[“id”：“223”，“设施代码”：“162”， "location_name": "黑岭医疗中心"],
14：[“id”：“196”， "facilitycode": "023", "location_name": "Spinnerpark"],
20：[“身份证”： "202", "facilitycode": "048", "location_name": "教育剧院"],
30：[“id”：“212”，“设施代码”：“090”，“location_name”：“合作伙伴 医务室"],
49：[“id”：“231”，“设施代码”：“223”， "location_name": "GreenBay 行政办公室"]

字典很长。我有一个Textbox，它在数据更改时触发，我用它来创建一个搜索变量。如果有人输入“ar”，我想过滤字典中包含字符“ar”的所有内容，以便我可以使用原始大字典列表中更小的子部分重置选取器列表。

过滤器 let filteredDictionaries = facilityDict.filter{$0.value.contains(where: {$0.value.contains("ar")})}.map{$0.value} 似乎可以很好地过滤字典，但是我需要搜索不区分大小写。我可以设置哪些选项来将过滤器显示更改为不区分大小写？

Answer 1

包含方法它与range(of: "String") != nil 相同，没有任何选项。您只需要使用 String != nil 的范围和不区分大小写的选项：

extension String {
    func contains(_ string: String, options: CompareOptions) -> Bool {
        return range(of: string, options: options) != nil
    }
}

现在你可以这样做了：

"whatever".contains("ER", options: .caseInsensitive)

如果您需要从字典数组创建字典，则需要使用 forEach 遍历结果并从中重建字典：

---

let facilityDict: [Int: [String: String]] = [
    17: ["id": "199", "facilitycode": "036", "location_name": "Centerpoint Medical Offices"],
    41: ["id": "223", "facilitycode": "162", "location_name": "Dark Ridge Medical Center"],
    14: ["id": "196", "facilitycode": "023", "location_name": "Spinnerpark"],
    20: ["id": "202", "facilitycode": "048", "location_name": "Educational Theater"],
    30: ["id": "212", "facilitycode": "090", "location_name": "Partner Medical Offices"],
    49: ["id": "231", "facilitycode": "223", "location_name": "GreenBay Administrative Offices"]]

var filtered: [Int: [String: String]] =  [:]

facilityDict.filter{$0.value.contains{$0.value.contains("AR", options: .caseInsensitive)}}.forEach{filtered[$0.key] = $0.value}

print(filtered)  // [30: ["id": "212", "facilitycode": "090", "location_name": "Partner Medical Offices"], 41: ["id": "223", "facilitycode": "162", "location_name": "Dark Ridge Medical Center"], 14: ["id": "196", "facilitycode": "023", "location_name": "Spinnerpark"]]