swift - 无法更新嵌套字典的值

Question

我正在尝试更新未知类型的复杂 Dictionary 中的值，因为它同时包含 String 和子词典。我的初始化函数代码如下。

这是我的 Dictionary 之前的样子:

var methods = [
    "PUN": [
        "name": "Time of PUN",
        "params": ["FJ": 18, "IS": 17]
    ],
    "KHR": [
        "name": "Time KHR",
        "params": ["FJ": 15, "IS": 15]
    ],
    "LHR": [
        "name": "Time of LHR",
        "params": ["FJ": 19.5, "IS": 17.5 , "MG": 8.9]
    ]
]

这就是我想要动态实现的:

var methods = [
    "PUN": [
        "name": "Time of PUN",
        "params": ["FJ": 18, "IS": 17, "Offset": "0 min", "Midnight": "Standard"]
    ],
    "KHR": [
        "name": "Time KHR",
        "params": ["FJ": 15, "IS": 15, "Offset": "0 min", "Midnight": "Standard"]
    ],
    "LHR": [
        "name": "Time of LHR",
        "params": ["FJ": 19.5, "IS": 17.5 , "MG":8.9, "Offset": "0 min", "Midnight": "Standard"]
    ]
]

这是我的代码:

我从 defaultParams(Dictionary)中获取额外值并插入到methods(Dictionary ).

var methods = [String: AnyObject]()
let defaultParams = ["Offset": "0 min", "Midnight": "Standard"]

init() { 
    methods["Punjab"] = [
        "name": "Punjab Time",
        "params": ["FJ": 18, "IS": 17]
    ]

    methods["Karachi"] = [
        "name": "Time of Karachi",
        "params": ["FJ": 15, "IS": 15]
    ]

    methods["Lahore"] = [
        "name": "Lahore City Time",
        "params": ["FJ": 19.5, "IS": 17.5 , "MG": 8.9]
    ]     

    for (methodName, methodValue) in methods {
        var params = methodValue["params"]!!

        for (defaultParamKey, defaultParamValue) in defaultParams {
            if params.objectForKey(defaultParamKey) == nil {
                // I am having problem with the line below, it says 
                // cannot asign a value of type String to a value of type AnyObject?!
                params[defaultParamKey] = defaultParamValue
            }
        }
    }
}

在初始化时，我只想通过使用变量 defaultParams 检查字典变量 methods 来插入缺失值。

Answer 1

这有点复杂，但它有效:

class Test {
    var methods = [String: [String: AnyObject]]()
    let defaultParams = ["Offset": "0 min", "Midnight": "Standard"]

    init() {
        methods["Punjab"] = [
            "name": "Punjab Time",
            "params": ["FJ": 18, "IS": 17]
        ]

        methods["Karachi"] = [
            "name": "Time of Karachi",
            "params": ["FJ": 15, "IS": 15]
        ]

        methods["Lahore"] = [
            "name": "Lahore City Time",
            "params": ["FJ": 19.5, "IS": 17.5 , "MG": 8.9]
        ]

        for (methodName, methodValue) in methods {

            for (mKey, mValue) in methodValue {

                if mKey == "params" {

                    var pDic = mValue as! [String: AnyObject]

                    for (defaultKey, defaultValue) in defaultParams {

                        if !contains(pDic.keys, defaultKey) {

                            pDic[defaultKey] = defaultValue

                            methods[methodName]!["params"]! = pDic

                        }

                    }



                }

            }

        }
    }
}

let t = Test()
println(t.methods)

结果:

[Karachi: [params: { FJ = 15; IS = 15; Midnight = Standard; Offset = "0 min"; }, name: Time of Karachi], Punjab: [params: { FJ = 18; IS = 17; Midnight = Standard; Offset = "0 min"; }, name: Punjab Time], Lahore: [params: { FJ = "19.5"; IS = "17.5"; MG = "8.9"; Midnight = Standard; Offset = "0 min"; }, name: Lahore City Time]]