ios - swift 字典中的 "Extract"数组

Question

我是 Swift 的新手，需要您的帮助来解决(可能)非常基本的问题。

我有一本字典:

var dict = ["title" : "Title", "Features" : ["feat1", "feat2", "feat3"], ...]

我可以像这样从中创建一个字符串:

var headline = dict["title"]! as string

但我无法创建数组。我尝试了各种组合:

var features = dict["Features"]
var features = dict["Features"]! as Array
var features: Array = dict["Features"]

所以请赐教!如何创建数组？有可能吗？

Answer 1

您应该指定数组的类型。要么

let features = dict["Features"] as [String] 

或

let features = dict["Features"] as Array<String>

参见 The Swift Language. 中关于集合类型的讨论