GitHub - saoudrizwan/DynamicJSON: Access JSON properties dynamically like JavaSc...
source link: https://github.com/saoudrizwan/DynamicJSON
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README.md
Installation • Usage • License
DynamicJSON is a dynamically typed parser for JSON built upon the new @dynamicMemberLookup
feature introduced by Chris Lattner in Swift 4.2. This allows us to access arbitrary object members which are resolved at runtime, allowing Swift to be as flexible as JavaScript when it comes to JSON.
Before
if let jsonObject = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any], let user = jsonObject["user"] as? [String: Any], let username = user["username"] as? String { // ... }
After
let username = JSON(data).user?.username?.string
Installation
pod 'DynamicJSON'
github "saoudrizwan/DynamicJSON"
- Or drag and drop
DynamicJSON.swift
into your project.
And import DynamicJSON
in the files you'd like to use it.
Usage
1. Initialize ?
Throw Any
thing into a JSON
object to get started
let json = JSON(Data()) JSON(123) JSON(["key": "value"]) JSON(["element", 1]) JSON("Hello world") JSON(false)
...or cast a literal as JSON
let json = "Hello world" as JSON 123 as JSON [1, 2, 3] as JSON let user: JSON = [ "username": "Saoud", "age": 21, "address": [ "zip": "12345", "city": "San Diego" ] ]
2. Drill in ⛏
Treat JSON
objects like you're in JavaScript Land
let dictionary = json.dictionary let array = json[0]?.cars?.array let string = json[3]?.users?[1]?.username?.string let nsnumber = json.creditCard?.pin?.number let double = json[3]?[1]?.height?.double let int = json[0]?.age.int let bool = json.biography?.isHuman?.bool
Note how JSON
doesn't actually have properties like cars
or users
, instead it uses dynamic member lookup to traverse through its associated JSON data to find the object you're looking for.
In case you have a key that's an actual property of JSON
, like number
or description
for example, just use the string subscript accessor like so:
let number = json.account?.contact?["number"]?.number let description = json.user?.biography?["description"]?.string
3. Have fun ?
JSON
conforms to Comparable
let json1 = JSON(jsonData1) let json2 = JSON(jsonData2) // Equality applies to all types (Dictionary, Array, String, NSNumber, Bool, NSNull) let isEqual = json1 == json2 // Less/greater than only applies to NSNumbers (Double, Int) and Strings let isLessThan = json1 < json2 let isLessThanOrEqual = json1 <= json2 let isGreaterThan = json1 > json2 let isGreaterThanOrEqual = json1 >= json2
Pretty print for debug purposes
print(json)
Convert to raw object
let anyObject = json.object
Convert to Data
let data = json.data() // optionally specify options...
License
DynamicJSON uses the MIT license. Please file an issue if you have any questions or if you'd like to share how you're using DynamicJSON.
Contribute
DynamicJSON is in its infancy, but provides the barebones of a revolutionary new way to work with JSON in Swift. Please feel free to send pull requests of any features you think would add to DynamicJSON and its philosophy.
Questions?
Contact me by email [email protected], or by twitter @sdrzn. Please create an issue if you come across a bug or would like a feature to be added.
Notable Mentions
- Paul Hudson's wonderful literature over
@dynamicMemberLookup
- Chris Lattner's Swift Evolution Propsal SE-0195
- SwiftyJSON for giving me a better idea of what the community wants out of a JSON parser
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