Bool将忽略struct中的dict值

Question

现在在底部带有一个简短的最小可行示例

我看到了这种怪异的行为..我试图将时间序列条目的位置设置为true：

struct TimeSeriesEntry: Codable, Equatable {
    let id: String
    let uid: String
    let date: Date
    let apps: [String:Double]
    let locations: [String:Bool]

    func changeApp(app: String, value: Double) -> TimeSeriesEntry {
        var apps = self.apps
        apps[app] = value

        return TimeSeriesEntry(id: self.id, uid: self.uid, date: self.date, apps: apps, locations: self.locations)
    }
}

此代码没有扩展名。完全是TimeSeriesEntry。

我正在调试器中对此进行评估，因为出于某种原因始终将其设置为 false ，但是我在代码中将其硬编码为 true 。它在调试器中的工作原理相同：

调试器评估

TimeSeriesEntry(id: String(describing: UUID()), uid: DBIFirebase.uid, 
    date: data.date.round(to: TimeSeries.defaults.interval, 
    TimeSeries.defaults.intervalComponent), apps:[:], locations: 
    [data.id:true])
.locations["c72b2cc2-897e-4621-8fba-452cf43afa0a"]

结果

... = (Bool?) false

在其他地方，当我分配apps时，双打效果很好。我对为什么发生这种情况有些困惑。

附录

实际分配是在此函数中进行的，在代码的此分支中，它是函数中位置的部分，而不是应用程序中的部分：

func timeSeriesData (appData: AppData? = nil, locationData: LocationData? = nil) -> TimeSeriesEntry? {
    if let data = appData {
        return TimeSeriesEntry(id: String(describing: UUID()), uid: DBIFirebase.uid, date: data.date.round(to: TimeSeries.defaults.interval, TimeSeries.defaults.intervalComponent), apps: [data.id:data.metric], locations:[:])
    } else {
        guard let data = locationData else {
            return nil
        }
        return TimeSeriesEntry(id: String(describing: UUID()), uid: DBIFirebase.uid, date: data.date.round(to: TimeSeries.defaults.interval, TimeSeries.defaults.intervalComponent), apps:[:], locations: [data.id:true])
    }
}

使其成为完整的独立mve：

import Foundation

struct TimeSeriesEntry: Codable, Equatable {
    let id: String
    let uid: String
    let date: Date
    let apps: [String:Double]
    let locations: [String:Bool]

    func changeApp(app: String, value: Double) -> TimeSeriesEntry {
        var apps = self.apps
        apps[app] = value

        return TimeSeriesEntry(id: self.id, uid: self.uid, date: self.date, apps: apps, locations: self.locations)
    }
}

struct LocationData: Codable, Equatable {
    //    let name: String
    let id: String
    let date: Date
    let latitude: Double
    let longitude: Double
}

func timeSeriesData (locationData: LocationData) -> TimeSeriesEntry? {
    return TimeSeriesEntry(id: String(describing: UUID()), uid: "DBIFirebase.uid", date: locationData.date, apps:[:], locations: [locationData.id:true])
}

let df = DateFormatter()
df.dateFormat = "yyyy-MM-dd HH:mm:ssZ"

let locationData = LocationData(
    id: "c72b2cc2-897e-4621-8fba-452cf43afa0a",
    date: df.date(from: "2017-08-28 00:00:01Z")!,
    latitude: 67.1404,
    longitude: -151.4804)

let timeSeriesEntry = timeSeriesData(locationData: locationData)

在repl中，位置将包含1个具有正确ID的条目，但bool设置为 false ：

 39. let timeSeriesEntry = timeSeriesData(locationData: locationData)

df: DateFormatter = {
  Foundation.Formatter = {
    baseNSObject@0 = {
      isa = NSDateFormatter
    }
  }
}
locationData: LocationData = {
  id = "c72b2cc2-897e-4621-8fba-452cf43afa0a"
  date = 2017-08-28 00:00:01 UTC
  latitude = 67.1404
  longitude = -151.4804
}
timeSeriesEntry: TimeSeriesEntry? = some {
  id = "C836C671-B266-4CA1-9A80-841E3329C6C8"
  uid = "DBIFirebase.uid"
  date = 2017-08-28 00:00:01 UTC
  apps = 0 key/value pairs
  locations = 1 key/value pair {
    [0] = {
      key = "c72b2cc2-897e-4621-8fba-452cf43afa0a"
      value = false
    }
  }
}

编辑：好的，现在我很困惑。.我在repl中玩了一点，我明白了：

 42> timeSeriesEntry!.locations["c72b2cc2-897e-4621-8fba-452cf43afa0a"]
$R1: Bool? = true
 43> timeSeriesEntry!
$R2: TimeSeriesEntry = {
  id = "C836C671-B266-4CA1-9A80-841E3329C6C8"
  uid = "DBIFirebase.uid"
  date = 2017-08-28 00:00:01 UTC
  apps = 0 key/value pairs
  locations = 1 key/value pair {
    [0] = {
      key = "c72b2cc2-897e-4621-8fba-452cf43afa0a"
      value = false
    }
  }
}
 44> timeSeriesEntry!.locations
$R3: [String : Bool] = 1 key/value pair {
  [0] = {
    key = "c72b2cc2-897e-4621-8fba-452cf43afa0a"
    value = false
  }
}