我试图向字典中添加一个数组,但是我得到了这个错误:
无法将'[String : String]‘类型的值转换为所需的字典值类型'Array
下面是我的实现:
let dicContent:[String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray:Array = [[String: String]]()
myArray.append(dicContent)
let mainDict:[String:Array] = ["MainDictionary": myArray]
我在这一行let mainDict:[String:Array] = ["MainDictionary": myArray]
上得到错误
你们中的任何人可能知道我为什么会得到这个错误或解决这个问题的方法?
发布于 2019-04-19 02:45:47
不要使用Array
关键字来定义字典的类型。尝试以下操作来解决您的问题:
let dicContent: [String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = [[String: String]]()
myArray.append(dicContent)
let mainDict: [String: [[String: String]]] = ["MainDictionary": myArray]
因此,在这种情况下可以隐式定义变量的类型,因此您的代码可以简化为:
let dicContent = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
let mainDict = ["MainDictionary": [dicContent]]
发布于 2019-04-19 02:47:48
错误显示,您已将mainDict声明为
let mainDict:[String:Array]
但没有指定数组包含的内容。您可以尝试以下方法之一来解决此问题。
尝试:
let dicContent:[String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = [[String: String]]()
myArray.append(dicContent)
let mainDict:[String:[[String: String]]] = ["MainDictionary": myArray]
或者,如果你想使用Array关键字,你可以这样做:
let dicContent:[String: String] = ["Alabama": "Montgomery", "Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = Array<[String: String]>()
myArray.append(dicContent)
let mainDict:[String:Array<[String:String]>] = ["MainDictionary": myArray]
或者简单地说
let mainDict = ["MainDictionary": myArray]
使用Array关键字时,需要指定该数组将在< ... >中保存的对象类型
发布于 2019-04-19 02:46:03
let dicContent:[String: String] = ["Alabama": "Montgomery",
"Alaska":"Juneau","Arizona":"Phoenix"]
var myArray = [[String: String]]()
myArray.append(dicContent)
let mainDict:[String:Any] = ["MainDictionary": myArray]
let getArrayBack = mainDict["MainDictionary"] as! [[String:String]]
https://stackoverflow.com/questions/55751994
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