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Code Quality Rank: L5
Programming language: Objective-C
License: MIT License
Tags: Utility    
Latest version: v2.1.0

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README

GroundControl

Remote configuration for iOS

Many developers don't realize that they are allowed to remotely control the behavior of their app (provided that the application isn't downloading any new code).

GroundControl gives you a dead-simple way to remotely configure your app, allowing you to add things like feature flags, impromptu A/B tests, or a simple "message of the day".

It's built on top of AFNetworking, and provides a single category on NSUserDefaults (just add #import "NSUserDefaults+GroundControl.h" to the top of any file you want to use it in).

This project is part of a series of open source libraries covering the mission-critical aspects of an iOS app's infrastructure. Be sure to check out its sister projects: SkyLab, CargoBay, houston, and Orbiter.

Client Code

NSURL *URL = [NSURL URLWithString:@"http://example.com/defaults.plist"];
[[NSUserDefaults standardUserDefaults] registerDefaultsWithURL:URL];

...or if you need callbacks for success/failure, and prefer not to listen for a NSUserDefaultsDidChangeNotification:

NSURL *URL = [NSURL URLWithString:@"http://example.com/defaults.plist"];
[[NSUserDefaults standardUserDefaults] registerDefaultsWithURL:URL
  success:^(NSDictionary *) {
    // ...
} failure:^(NSError *) {
    // ...
}];

...or if you need to use an HTTP method other than GET, or need to set any special headers, specify an NSURLRequest:

NSURL *URL = [NSURL URLWithString:@"http://example.com/defaults.plist"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
[[NSUserDefaults standardUserDefaults] registerDefaultsWithURLRequest:request
  success:^(NSURLRequest *, NSHTTPURLResponse *, NSDictionary *) {
    // ...
} failure:^(NSURLRequest *, NSHTTPURLResponse *, NSError *) {
    // ...
}];

Server Code

GroundControl asynchronously downloads and reads a remote plist file. This could be a static file or generated dynamically, like in the following examples (see also the complete Sinatra application found in example/server):

Ruby

require 'sinatra'
require 'plist'

get '/defaults.plist' do
  content_type 'application/x-plist'

  {
    'Greeting' => "Hello, World",
    'Price' => 4.20,
    'FeatureXIsLaunched' => true
  }.to_plist
end

Python

from django.http import HttpResponse
import plistlib

def property_list(request):
    plist = {
         'Greeting': "Hello, World",
         'Price': 4.20,
         'FeatureXIsLaunched': True,
         'Status': 1
    }

    return HttpResponse(plistlib.writePlistToString(plist))

Node.js

var plist = require('plist'),
    express = require('express')

var host = "127.0.0.1"
var port = 8080

var app = express()

app.get("/", function(request, response) {
        response.send(plist.build(
            {
                'Greeting': "Hello, World",
                'Price': 4.20,
                'FeatureXIsLaunched': true,
                'Status': 1
            }
        ).toString())
})

app.listen(port, host)

Contact

Mattt Thompson

License

GroundControl is available under the MIT license. See the LICENSE file for more info.


*Note that all licence references and agreements mentioned in the GroundControl README section above are relevant to that project's source code only.