在对象数组中搜索字符串

Question

我正在应用程序中使用产品搜索引擎。

我有以下代码：

func searchStringInProductArray(searchString: String) {
    let documentsDir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let path = documentsDir.appendingPathComponent((AppGlobalManager.sharedManager.loggedUser?.selectedLanguage)! + "/json/products.json")
    do {
        let data = try Data(contentsOf: path)
        let decoder = JSONDecoder()
        var productsTmpObjectArray = [Products]()

        productsTmpObjectArray = try decoder.decode([Products].self, from: data)
        productsTmpObjectArray =  productsTmpObjectArray.filter({($0.code?.contains(searchString))!})
        productsTmpObjectArray =  productsTmpObjectArray.filter({($0.name?.contains(searchString))!})
        productsTmpObjectArray =  productsTmpObjectArray.filter({($0.langVersions.name?.contains(searchString))!})
        productsTmpObjectArray =  productsTmpObjectArray.filter({($0.langVersions?.description?.contains(searchString))!})
        productsObjectArray = productsTmpObjectArray
        collectionView1.reloadData()
    } catch {
        NotificationCenter.default.post(name: Notification.Name("NotificationAlertMessage"), object: nil, userInfo: ["object": errorMessage(title: "Blad".localized(), description: "problemWithParseData".localized(), buttonTitle: "Ok".localized())])
    }
}

和对象：

struct ChangeTime : Codable {
    let year : Int?
    let month : Int?
    let dayOfMonth : Int?
    let hourOfDay : Int?
    let minute : Int?
    let second : Int?
}

struct Lang : Codable {
    let id : Int?
    let code : String?
    let name : String?
}

struct LangVersions : Codable {
    let id : Int?
    let parentId : Int?
    let name : String?
    let lang : Lang?
    let description : String?
}

struct Products : Codable {
    let id : Int?
    let code : String?
    let name : String?
    let inPieces : Bool?
    let prepDeepFryer : String?
    let langVersions : [LangVersions]?
    let changeTime : ChangeTime?
}  

在TextField中输入文本后，将调用该函数：

@IBAction func searchProductTextFieldChanged(_ sender: Any) {
    searchStringInProductArray(searchString: searchTextField.text!)
}

我有以下错误：

1. productsTmpObjectArray = productsTmpObjectArray.filter（{（$ 0.langVersions.name?.contains(searchString））！}）-类型[LangVersions]的值？ 没有成员“名称”

2. productsTmpObjectArray = productsTmpObjectArray.filter（{（$ 0.langVersions？.description？.contains（searchString））！}）-无法对类型为'String'的非可选值使用可选链接

我希望我的搜索引擎一次搜索所有字段：

• $ 0.code？.contains（searchString）

• $ 0.name？.contains（searchString）

• $ 0.langVersions.name？.contains（searchString）

• $ 0.langVersions？.description？包含（searchString）

Answer 1

您尚未注意到“产品”对象包含“ LangVersions”对象的数组。 方法的编辑版本：

func searchStringInProductArray(searchString: String) {
    let documentsDir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let path = URL(string: "")!
    do {
        let data = try Data(contentsOf: path)
        let decoder = JSONDecoder()
        var productsTmpObjectArray = [Products]()

        productsTmpObjectArray = try decoder.decode([Products].self, from: data)
        productsObjectArray =   productsTmpObjectArray.filter({return ($0.code?.lowercased().contains(searchString.lowercased()))! || ($0.name?.lowercased().contains(searchString.lowercased()))! || (($0.langVersions?.filter({($0.name?.lowercased().contains(searchString.lowercased()))!}))?.count)! > 0 || (($0.langVersions?.filter({($0.description?.lowercased().contains(searchString.lowercased()))!}))?.count)! > 0 })
        collectionView1.reloadData()
    } catch {
        NotificationCenter.default.post(name: Notification.Name("NotificationAlertMessage"), object: nil, userInfo: ["object": errorMessage(title: "Blad".localized(), description: "problemWithParseData".localized(), buttonTitle: "Ok".localized())])
    }
}

Answer 2

您可以尝试此搜索所有值

let searchString = "searStr".lowercased()

productsTmpObjectArray = productsTmpObjectArray.filter { ($0.name?.lowercased().contains(searchString))! || ($0.code?.lowercased().contains(searchString))! ||   $0.langVersions?.filter {($0.name?.lowercased().contains(searchString))!}.count != 0 || $0.langVersions?.filter {($0.description?.lowercased().contains(searchString))!}.count != 0 }