Keith Moon
3pods
A simple, Swifty way to interact with JSON.
JSONNode is simple, useful, and under 150 lines of code.
Let's take the response from the ImgFlip Meme API
JSON
{
"success": true,
"data": {
"memes": [
{
"id": "61579",
"name": "One Does Not Simply",
"url": "http://i.imgflip.com/1bij.jpg",
"width": 568,
"height": 335
},
{
"id": "101470",
"name": "Ancient Aliens",
"url": "http://i.imgflip.com/26am.jpg",
"width": 500,
"height": 437
}
]
}
}
To retrieve the name for the first meme, you would do the following:
```Swift var jsonObject = try! JSONSerialization.jsonObject(with: jsonData, options: [.allowFragments])
guard let jsonDictionary = jsonObject as? [String: Any], let dataDictionary = jsonDictionary["data"] as? [String: Any], let memesArray = dataDictionary["memes"] as? [[String: Any]], let firstMeme = memesArray.first, let memeName = firstMeme["name"] as? String else {
fatalError()
}
print(memeName) ```
With JSONNode this becomes the following:
```Swift var jsonNode = try! JSONNode(data: jsonData) guard let name = jsonNode["data"]["memes"][0]["name"].string else { fatalError() }
print(name) ```
Typically when JSON is deserialised, it is turned into nested arrays and dictionary, and since these collections need a type and the JSON could contain any of multiple types, the non-specific Any protocol is used.
This is not a true representation of the situation though. There can't be "anything" in the collection. Each node in the JSON structure can only be one of the following: - String - Boolean - Integer - Floating point number - Array containing something in this list - Dictionary with a string key and value as something in this list
With this finite list of possible values for a JSON node, a enum is the best way to represent that. Inspiration was taken from the way that Swift Playgrounds passes information been the playground page and the live view.
You can use CocoaPods to install JSONNodeby adding it to your Podfile:
```ruby platform :ios, '8.0' use_frameworks!
target 'MyApp' do pod 'JSONNode' end ```
Note that this requires CocoaPods version 36, and your iOS deployment target to be at least 8.0:
To use this library in your project manually you may:
License: MIT