Swift字典，数组为值

How do you declare a dictionary that has an array as the value? Is this even possible?

如何声明一个以数组作为值的字典？这有可能吗？

3 个解决方案

#1

Yes

是

let myDictionary: [String: [Int]] = ["Hello": [1, 2, 3], "World": [4, 5, 6]]

In fact, you don't even need the explicit type declaration if you assign an initial value in place. It can go as simple as:

实际上，如果您分配了初始值，则甚至不需要显式类型声明。它可以简单到：

let myDictionary = ["Hello": [1, 2, 3], "World": [4, 5, 6]]

To use the value:

要使用该值：

println(myDictionary["Hello"][0]) // Print 1
println(myDictionary["World"][0]) // Print 4

#2

 var dictionary : [String:[AnyObject]]

 var dictionary2 = [String:[AnyObject]]()

You can change AnyObject for any class or use it like AnyObject itself if you don't know the class that will be in the array.

如果您不知道将在数组中的类，您可以为任何类更改AnyObject或像AnyObject本身一样使用它。

#3

If you want to store for example an array of strings:

如果要存储例如字符串数组：

var dict: [String: [String]]

or without syntactic sugar:

或没有语法糖：

var dict: Dictionary<String, Array<String>>

Dictionaries, like arrays and more generally whatever uses generics, can handle anything that is a swift type, including tuples, closures, dictionaries, dictionaries of dictionaries, arrays of dictionaries, etc. - unless conditions are specified for the generic type (for instance, a dictionary key can be any type that implements the Hashable protocol), and in that case types must conform to the constraints.

字典，如数组，更常见的是使用泛型，可以处理任何快速类型的东西，包括元组，闭包，字典，字典字典，字典数组等等 - 除非为泛型类型指定条件（例如，字典键可以是实现Hashable协议的任何类型，在这种情况下，类型必须符合约束。

#1

Yes

是

let myDictionary: [String: [Int]] = ["Hello": [1, 2, 3], "World": [4, 5, 6]]