arrays - 检查值是否与自定义数组元素列表中的键匹配并检索其值

Question

我在 Swift 中有两个自定义数据数组。我想找到包含字典值的对象，其“目的地”等于第二个数组中的“PlaceId”。这是带有一些数据的结构，只是为了展示它们的外观。

struct FlightInfo {
var minPrice = "648"
var carrier = "Canada Air ways"
var destination = "973973"
var origin = "983983"
}


struct PlaceData {
var cityName = "Melbourne"
var name = "Melbourne"
var cityId = "MEL"
var type = "blah"
var countryName = "Australia"
var placeId = 983983
}

到目前为止我得到了这个:

    let destId = flightsArray[indexPath.row].destination as String
    let results = listOfPlaces.filter { $0.placeId == Int(destId) }

但没有雪茄。我怎样才能得到像下面这样的最终结果:

cell.destinationLabel.text = results.placeID

Answer 1

首先，我会重新考虑使用 Dictionary 作为模型对象。使用 structs、classes 和 enums 是非常可靠的。因此，您的模型看起来类似于:

enum FlightType: String {
    case a = "A"
    case b = "B"
}

enum PlaceType: String {
    case station = "station"
    case port = "port"
}

struct Flight {
    var name: String
    var destinationId: Int
    var type: FlightType
}

struct Place {
    var identifier: Int
    var title: String
    var type: PlaceType
}

假设你有这样的数组:

let flights = [
    Flight(name: "Trenton", destinationId: 403, type: .a),
    Flight(name: "Houston", destinationId: 288, type: .a),
    Flight(name: "Boston", destinationId: 244, type: .a)
]

let places = [
    Place(identifier: 111, title: "Leslie", type: .station),
    Place(identifier: 228, title: "Mary", type: .station),
    Place(identifier: 684, title: "Joe", type: .station),
    Place(identifier: 288, title: "Paul", type: .station),
    Place(identifier: 465, title: "Stephanie", type: .station),
    Place(identifier: 569, title: "Steve", type: .station),
    Place(identifier: 663, title: "Doug", type: .station)
]

您可以像这样获取航类的目的地标题:

let destinationId = flights[indexPath.row].destinationId
let destinationTitle = places.filter{ $0.identifier == destinationId }.first?.title