字典

Question

到目前为止我有这个声明：

var meals : [String : Array<String>]

meals = ["Option1": ["01-01-2015","05-02-2015"],
         "Option2": ["05-01-2015","10-04-2015"],
         "Option3": ["03-02-2015", "07-07-2015"]]

我想做类似的事情，但我不知道如何声明meals变量：

meals = ["Option1": ["01-01-2015","05-02-2015"], 2
         "Option2": ["05-01-2015","10-04-2015"], 2
         "Option3": ["03-02-2015", "07-07-2015", "09-08-2015"], 3]

我想将第三个参数添加到字典数组中，即整数，因此每个OptionX必须有2个参数：日期数组和整数。

我知道字典必须是Key-Value，所以我想知道如何为每个数组添加3个元素。我想我必须创建数组数组？

Answer 1

您可以使用元组，我会明确说明字典类型以使事情更清晰：

let meals: [String: ([String], Int)] = ["Option1": (["01-01-2015","05-02-2015"], 2),
                                        "Option2": (["05-01-2015","10-04-2015"], 2),
                                        "Option3": (["03-02-2015", "07-07-2015", "09-08-2015"], 3)]

if let option1 = meals["Option1"] {
    println(option1.0) // Prints: "[01-01-2015, 05-02-2015]"
    println(option1.1) // Prints: "2"
}

或者，您可以使用结构：

struct MealOption {
    // More descriptive variable names would be a good idea here...
    let a: [String]
    let b: Int
}

let meals: [String: MealOption] = ["Option1": MealOption(a: ["01-01-2015","05-02-2015"], b: 2)]

if let option1 = meals["Option1"] {
    println(option1.a) // Prints: "[01-01-2015, 05-02-2015]"
    println(option1.b) // Prints: "2"
}