ios - 无法使用类型为 '[Int : [String]]' 的索引下标类型为 'String!' 的值

Question

请问我错在哪里？我有 Xcode 错误:

Cannot subscript a value of type '[Int : [String]]' with an index of type 'String!'

在 let keyExists = myDict[tmp.Hour] != nil, myDict[tmp.Hour] = Int 和 myDict[tmp.Hour].append(tmp.Minutes) 这部分代码中:

func array() -> Dictionary <Int,[String]>
    {

        let timeInfos = getTimeForEachBusStop()

        var myDict: Dictionary = [Int:[String]]()


        for tmp in timeInfos {

        let keyExists = myDict[tmp.Hour] != nil
           if (!keyExists) {
                myDict[tmp.Hour] = [Int]()
            }
           myDict[tmp.Hour].append(tmp.Minutes)
            }
        return myDict
    }

我明白，该问题是可选类型，但我不明白问题在哪里

更新

 func getTimeForEachBusStop() -> NSMutableArray {

        sharedInstance.database!.open()
        let lineId = getIdRoute

        let position = getSelectedBusStop.row + 1


        let getTimeBusStop: FMResultSet! = sharedInstance.database!.executeQuery("SELECT one.hour, one.minute FROM shedule AS one JOIN routetobusstop AS two ON one.busStop_id = (SELECT two.busStop_id WHERE two.line_id = ? AND two.position = ?) AND one.day = 1 AND one.line_id = ? ORDER BY one.position ASC ", withArgumentsInArray: [lineId, position, lineId])


        let getBusStopInfo : NSMutableArray = NSMutableArray()

        while getTimeBusStop.next() {

            let stopInfo: TimeInfo = TimeInfo()
            stopInfo.Hour = getTimeBusStop.stringForColumnIndex(0)
            stopInfo.Minutes = getTimeBusStop.stringForColumnIndex(1)
            getBusStopInfo.addObject(stopInfo)

        }
       sharedInstance.database!.close()
       return getBusStopInfo

    }

Answer 1

您将字典声明为具有 Int 类型键和 [String] 类型值的字典:

var myDict: Dictionary = [Int:[String]]()

(最好写成:var myDict: [Int: [String]] = [:] 因为通过将其转换为 Dictionary 您将删除类型)。

然而，在

myDict[tmp.Hour] = [Int]()

您正在使用一个 [Int] 类型的值，tmp.Hour 可能是一个 String。

所以，您的问题是类型不匹配。