ios - 嵌套字典中的 Swift 访问字段

Question

我必须处理像这样或更多嵌套的字典。我怎样才能访问像“twotwo”这样的字段？或者是否有更好的可能性来模拟这种结构？

let nestedDict = [
    "fieldOne": "name",
    "fieldTwo": "name",
    "fieldThree":
        [
            [
            "twoOne": "some text",
            "twoTwo": true,
            "twoThree": 1e-40
            ],
            [
            "twoOne": "some text",
            "twoTwo": true,
            "twoThree": 1e-40
            ]
        ]
]

Answer 1

nestedDict 是一个字典，你得到fieldThree

let fieldThree = nestedDict["fieldThree"] as! [[String:Any]] // [[String:AnyObject]] in Swift 2 and lower.

fieldThree 是 [String:AnyObject] 字典的Array，你得到 twoTwo 的值带有

的第一个数组项

let twoTwo = fieldThree[0]["twoTwo"] as! Bool

您甚至可以检索数组中键 twoTwo 的所有值

let allTwoTwo = fieldThree.map { $0["twoTwo"] as! Bool }