LumaJSON
An extremely simple and light-weight Swift wrapper for Objective-C JSON parser
Usage
To use this in your project, just copy the file in to your project. Normally I'm a fan of Cocoapods and all that, but it just seems unneccessary given the simplicity of what is really being done here.
Given a JSON structure such as:
{
"user": {
"name": "jquave",
"id": 542,
"url": "http://jamesonquave.com"
},
"friend_ids": [
299,
341,
492
],
"alert_message": "Please verify e-mail address to continue"
}LumaJSON will recognize this as having a root NSDictionary node with three keys: user, friend_ids, and alert_message
These can be accessed using a subscript, and will return either an Optional LumaJSONObject or an object of the expected type if cast.
Example:
if let parsed = LumaJSON.parse(jsonStr) {
// Simple printing to the console to check JSON structure
println(parsed)
// Simple Key/Value retreival
if let alertMessage = parsed["alert_message"] as? String {
println("Alert: \(alertMessage)")
}
// Nested JSON
if let userName = parsed["user"]?["name"] as? String {
println("Username is \(userName)")
}
// Nested object casting works using Swift's built-in mechanisms
if let friendIDs = parsed["friend_ids"] as? [Int] {
for friendID in friendIDs {
println("Friend ID: \(friendID)")
}
}
}Output to console:
LumaJSONObject: Optional({
"alert_message" = "Please verify e-mail address to continue";
"friend_ids" = (
299,
341,
492
);
user = {
id = 542;
name = jquave;
url = "http://jamesonquave.com";
};
})
Alert: Please verify e-mail address to continue
Username is jquave
Friend ID: 299
Friend ID: 341
Friend ID: 492Encoding Swift objects to JSON
Encoding objects as JSON requires creating an object that adheres to [String: AnyObject] at the root level.
var myData = [String: AnyObject]()
myData["friend_count"] = 4
myData["username"] = "jquave"
if let str = LumaJSON.jsonFromObject(myData) {
println(str)
}Outputs:
{"username":"jquave","friend_count":4}
Under MIT License http://opensource.org/licenses/MIT