从Object中的Array值创建数组

Question

finalRestaurantArray是一个PFObjects数组，其中包含每个对象的数组CloseHours。 CloseHours包含一周中每一天的结束时间[0-6]。

如何为每个对象创建一个包含CloseHours[dayOfWeek]值的数组。如果是星期二（let dayOfWeek = 1），则数组应如下所示：

 [0015, 2350]

当前尝试：

    //create array of CloseHours
    let initialCloseRestaurantHours = finalRestaurantArray.map { $0.objectForKey("CloseHours") as [String] }
    //get the close hour for given day
    let closeRestaurantHours = initialCloseRestaurantHours.map { $0.objectAtIndex(dayOfWeek) as String }
    //Error: [string] does not have a member named objectAtIndex 

其他信息

这是对象数组finalRestaurantArray

[<Restaurant: 0x17411aca0, objectId: LA74J92QDA, localId: (null)> {
    Name = "First One";
    CloseHours =     (
        0005,
        0015,
        0025,
        0035,
        0045,
        0055,
        0065
    );
}, <Restaurant: 0x17411b480, objectId: 0aKFrpKN46, localId: (null)> {
    Name = "Second One";
    CloseHours =     (
        0015,
        2350,
        2350,
        2350,
        2350,
        2350,
        2350
    );
}]

Answer 1

而不是$0.objectAtIndex(dayOfWeek)尝试$0[dayOfWeek]。 $0现在是类型[String]的Swift数组，Swift数组没有objectAnIndex:方法。