Swift 访问嵌套字典中的字段

Question

我必须处理像这样或更多嵌套的字典。如何访问 "twotwo" 之类的字段？或者有没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 Dictionary，你得到 fieldThree 和

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

fieldThree 是 Array 个 [String:AnyObject] 字典，你得到第一个数组项 twoTwo 的值

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 { [=12=]["twoTwo"] as! Bool }

Swift 访问嵌套字典中的字段

Swift access fields in nested dictionary

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