ios 如何在 Swift 中解析已解析的 JSON 中的数组？
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How do I parse an array inside parsed JSON in Swift?
提问by Paul Vorobyev
I'm using an API that returns JSON that looks like this
我正在使用一个返回 JSON 的 API，它看起来像这样
{
"boards":[
{
"attribute":"value1"
},
{
"attribute":"value2"
},
{
"attribute":"value3",
},
{
"attribute":"value4",
},
{
"attribute":"value5",
},
{
"attribute":"value6",
}
]
}
In Swift I use two functions to get and then parse the JSON
在 Swift 中，我使用两个函数来获取然后解析 JSON
func getJSON(urlToRequest: String) -> NSData{
return NSData(contentsOfURL: NSURL(string: urlToRequest))
}
func parseJSON(inputData: NSData) -> NSDictionary{
var error: NSError?
var boardsDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(inputData, options: NSJSONReadingOptions.MutableContainers, error: &error) as NSDictionary
return boardsDictionary
}
and then I call it using
然后我用
var parsedJSON = parseJSON(getJSON("link-to-API"))
The JSON is parsed fine. When I print out
JSON 解析得很好。当我打印出来
println(parsedJSON["boards"])
I get all the contents of the array. However I am unable to access each individual index. I'm positive it IS an Array, because ween I do
我得到了数组的所有内容。但是我无法访问每个单独的索引。我肯定它是一个数组，因为我确实这样做了
parsedJSON["boards"].count
the correct length is returned. However if I attempt to access the individual indices by using
返回正确的长度。但是，如果我尝试通过使用访问各个索引
parsedJSON["boards"][0]
XCode turns off syntax highlighting and gives me this:
XCode 关闭语法高亮并给我这个：
and the code won't compile.
并且代码不会编译。
Is this a bug with XCode 6, or am I doing something wrong?
这是 XCode 6 的错误，还是我做错了什么？
采纳答案by micahbf
Dictionary access in Swift returns an Optional, so you need to force the value (or use the if letsyntax) to use it.
Swift 中的字典访问返回一个 Optional，因此您需要强制该值（或使用if let语法）来使用它。
This works:
parsedJSON["boards"]![0]
这有效：
parsedJSON["boards"]![0]
(It probably shouldn't crash Xcode, though)
（不过，它可能不应该使 Xcode 崩溃）
回答by user3764120
Take a look here:https://github.com/lingoer/SwiftyJSON
看看这里：https: //github.com/lingoer/SwiftyJSON
let json = JSONValue(dataFromNetworking)
if let userName = json[0]["user"]["name"].string{
//Now you got your value
}
回答by Niloy Mahmud
You can create a variable
您可以创建一个变量
var myBoard: NSArray = parsedJSON["boards"] as! NSArray
and then you can access whatever you have in "boards" like-
然后你可以访问你在“板”中拥有的任何东西，比如-
println(myBoard[0])
回答by voidref
The correct way to deal with this would be to check the return from the dictionary key:
处理这个问题的正确方法是检查字典键的返回：
if let element = parsedJSON["boards"] {
println(element[0])
}
