swift - 从字典 Swift 中检索数据

Question

我正在尝试从字典中检索数据并将值分配给“city”。我想使用 information[1]["City"]，但这也会产生错误。另外，不确定我是否需要在这里打开可选的包装。

let locals = ["Jerry":["City": "Seattle", "Preference": "Adventurer"],"Emily":["City": "Boston", "Preference": "History Buff"]              


func matchTravellerWithLocal(location: String, type: String) -> String {
    var message = " "
    let locals = LocalsInformation().locals
    for (name, information) in locals{
        let city = information["City"]!
        print(city)
        let preference = information["Preference"]
        if city == location{
            message = "Meet your local: \(name), a local of \(city)"
        }else{
            message = "Apologies, there aren't in \(city) on     LocalRetreat. Try again soon!"
            break
        }
        if preference == type{
            message += "who is also a \(preference)"
        }
    }
    return message
}

Answer 1

你的本地人应该这样定义:

let locals: [[String: Dictionary<String, String>]] = [["Jerry":["City": "Seattle", "Preference": "Adventurer"]],["Emily":["City": "Boston", "Preference": "History Buff"]]]

然后就可以这样访问了:

let jerry = locals[0]["Jerry"]