嵌套字典中的快速訪問字段

Question

我必須處理像這樣的字典，或者更多的嵌套字典。 如何訪問「twotwo」等字段？還是有更好的可能性來建模這樣的結構？

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fieldThree與

let fieldThree = nestedDict["fieldThree"] as! [[String:AnyObject]] 

fieldThree是[String:AnyObject]的Array的字典，你得到的第一個數組元素的twoTwo值與

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

您甚至可以檢索關鍵字的所有值0在陣列中

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