A brief introduction of https://github.com/dankogai/swift-json

1. Swift-JSON
@dankogai

2. What is it?

3. https://github.com/dankogai/swift-json

4. swift-json is…
• Wraps lengthy objective-c NSJSONSerialization
…
• into concise, swifty JSON
• even swiftier than SwiftyJSON
• Works both in Swift 1.0 (Xcode 6.0) and Swift 1.1

5. Object->JSON
let obj:[String:AnyObject] = [
"array": [JSON.null, false, 0, "", [], [:]],
"object":[
"null": JSON.null,
"bool": true,
"int": 42,
"double": 3.141592653589793,
"string": "a αt弾nꚲ",
"array": [],
"object": [:]
],
"url":"http://blog.livedoor.com/dankogai/"
]

6. Object->JSON
let json = JSON(obj)

7. String->JSON
let json = JSON(
string:"{"url":"http://blog.livedoor.com/dankogai/","array":
[null,false,0,"",[],{}],"object":{"object":{},"bool":true,"null
":null,"array":[],"int":42,"double":3.141592653589793,"string":
"a αt弾nꚲ"}}"
)

8. URL->JSON
let json = JSON(
URL:"http://api.dan.co.jp/asin/4534045220.json"
)

9. Tree Traversal
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 αt弾nꚲ"
json["array"][0].asNull // NSNull()
json["array"][1].asBool // false
json["array"][2].asInt // 0
json["array"][3].asString // ""

10. Error Handling
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}

11. Type Checking
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

12. Schema as Class
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"]) }
}

13. Schema as Class
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?

14. One More Thing
• Software Design で次号から連
載します

15. you.thank!
for q in questions {
q.answer
}