ios - 将数据类型附加到 Plist

Question

每次根元素(objstation)被解析并编码为DATA以写入plist时，我都会解析数据并实例化结构

XML 结构

<objStation>
        <StationDesc>Killester</StationDesc>
        <StationAlias/>
        <StationLatitude>53.373</StationLatitude>
        <StationLongitude>-6.20442</StationLongitude>
        <StationCode>KLSTR</StationCode>
        <StationId>101</StationId>
    </objStation>
    <objStation>
        <StationDesc>Clontarf Road</StationDesc>
        <StationAlias/>
        <StationLatitude>53.3629</StationLatitude>
        <StationLongitude>-6.22753</StationLongitude>
        <StationCode>CTARF</StationCode>
        <StationId>109</StationId>
    </objStation>

我在结构中使用以下方法来编码并写入plist，但是只有结构的当前实例保存到plist，我想知道如何附加到plist，因此所有根元素都保存到在 plist 中，我已经尝试过围绕 DATA 类型的各种快速 native 函数，但没有任何乐趣。也许我应该使用字典数组而不是结构体？

         //mark properties, update as necssary, based on xml strucutre
struct StationsEncoder: Codable {

    var station: String
    var latitude: String
    var longitude: String
    var code: String
    var id: String

    //MARK: Initialization

    init(station: String, latitude: String, longitude: String, code: String, id: String ) {
        self.station = station
        self.latitude = latitude
        self.longitude = longitude
        self.code = code
        self.id = id
    }

    //mark initializers
    // lets try encode our data
        func encoder(){
                let stationStruct = StationsEncoder(station: station, latitude: latitude, longitude: longitude, code: code, id: id)
                let encoder = PropertyListEncoder()
                encoder.outputFormat = .xml
                do {
                let data = try encoder.encode(stationStruct)
                try data.write(to: CreatePlist.shared.plistURL)

                } catch {
                // Handle error
                print(error)
                print( CreatePlist.shared.plistURL)
                }
                }


}

Answer 1

我使用 PropertyListSerialization 方法用一小段代码完成了此任务(再次感谢 Maddy，他指出您无法附加到 plist，节省了时间)。我发现最好的选择是先附加到字典，然后将整个字典写入 plist:

do {
    let writeData = try PropertyListSerialization.data(fromPropertyList: [parsedDictionary], format: .xml, options:0)
    //note CreatePlist.shared.plistURL is my URL, just replace with yours, I am accessing a singleton class that has the URL here for convenience:     
    try writeData.write(to: CreatePlist.shared.plistURL)
} catch {
    print(error)
}