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Even Swiftier JSON Handler
Just add json/json.swift to your project and have fun!
Turn your swift object to JSON like so:
let obj:[String:AnyObject] = [
"array": [JSON.null, false, 0, "", [], [:]],
"object":[
"null": JSON.null,
"bool": true,
"int": 42,
"double": 3.141592653589793,
"string": "a α\t弾\n𪚲",
"array": [],
"object": [:]
],
"url":"http://blog.livedoor.com/dankogai/"
]
let json = JSON(obj)
json.toString()
// "{\"array\":[null,false,0,\"\",[],{}],
// \"object\":{\"int\":42,\"double\":3.141592653589793,
// \"string\":\"a α\t弾\n𪚲\",\"object\":{},\"null\":null,
// \"bool\":true,\"array\":[]},
// \"url\":\"http://blog.livedoor.com/dankogai/\"}"
...or string...
let json = JSON(string:"{\"array\":[...}")
// let json = JSON.parse("{\"array\":[...}")
...or URL.
let json = JSON(url:"http://api.dan.co.jp/jsonenv")
// let json = JSON.fromURL("http://api.dan.co.jp/jsonenv")
Just traverse elements via subscript:
json["object"]["null"].asNull // NSNull()
json["object"]["bool"].asBool // true
json["object"]["int"].asInt // 42
json["object"]["double"].asDouble // 3.141592653589793
json["object"]["string"].asString // "a α\t弾\n𪚲"
json["array"][0].asNull // NSNull()
json["array"][1].asBool // false
json["array"][2].asInt // 0
json["array"][3].asString // ""
Don't worry if the subscripted entry does not exist. Just like SwiftyJSON it simply turns into the error object. Call that NSError Chain :-?
if let b = json["noexistent"][1234567890]["entry"].asBool {
// ....
} else {
let e = json["noexistent"][1234567890]["entry"].asError
println(e)
} // Error Domain=JSONErrorDomain Code=404 "["noexistent"] not found" UserInfo=0x10064bfc0 {NSLocalizedDescription=["noexistent"] not found}
What you see is what you get.
json["array"].type // "Array"
json["array"].isDictionary // true
json["array"].isLeaf // false
json["object"].type // "Dictionary"
json["object"].isDictionary // true
json["object"].isLeaf // false
json["url"].isLeaf // true
json["object"]["null"].type // "NSNull"
json["object"]["null"].isNull // true
json["object"]["bool"].type // "Bool"
json["object"]["bool"].isBool // true
json["object"]["bool"].isNumber // false
json["object"]["int"].type // "Int"
json["object"]["int"].isInt // 42
json["object"]["int"].isNumber // true
json["object"]["double"].type // "Double"
json["object"]["double"].isDouble // true
json["object"]["double"].isNumber // true
json["object"]["string"].type // "String"
json["object"]["string"].isString // true
Note that the iterator yields (k, v) pair for both array and dictionary:
for (i, v) in json["array"] {
// i is NSNumber, v is another JSON object
}
for (k, v) in json["object"] {
// k is NSString, v is another JSON object
}
But you still need subscripts to traverse an object (dictionary in Swift, that is). In JavaScript where JSON is originated, You don't need subscripts for string keys. They automagically turns into property names.
//json["object"]["string"] vs...
json.object.string
4 characters for each array or object! Can't we teach Swift how to access via methods?
Yes, we can!
//// schema by subclassing
class MyJSON : JSON {
override init(_ obj:AnyObject){ super.init(obj) }
override init(_ json:JSON) { super.init(json) }
var null :NSNull? { return self["null"].asNull }
var bool :Bool? { return self["bool"].asBool }
var int :Int? { return self["int"].asInt }
var double:Double? { return self["double"].asDouble }
var string:String? { return self["string"].asString }
var url: String? { return self["url"].asString }
var array :MyJSON { return MyJSON(self["array"]) }
var object:MyJSON { return MyJSON(self["object"]) }
}
Now do:
let myjson = MyJSON(obj)
myjson.object.null // NSNull?
myjson.object.bool // Bool?
myjson.object.int // Int?
myjson.object.double // Double?
myjson.object.string // String?
myjson.url // String?
This approach comes with bonus. You can't accidentaly access elements that was not supposed to there. JSON is schemaless and that is what makes JSON rule today. But that is also what makes JSON so prone to error. With Swift and this JSON class you get the best of both worlds -- flexibility of JSON and robustness of static typing.
See wiki/Discussion.
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