Latest 0.1.1
License MIT
Platforms ios 7.1, requires ARC
Dependencies ReactiveCocoa, ReactiveViewModel

A MVVM framework based on ReactiveCocoa and built with a goal to sepparate untestable UIKit view logic from testable business logic.

How does it work?

Well it’s pretty simple:

  • We create a new Model class:
    @interface MYViewModel : IOTableViewModel
  • We subclass any of the IO view controllers:
    @interface MYViewController : IOTableViewController
  • Then we implement the binding methods:
  • (void)pre
    [super pre];

    //This is where all the things prior to initializing the view go.
    //For example:
    [self rac_signalForSelector:@selector(scrollViewDidScroll:)

  • (void)setupViews
    [super setupViews];

    //Here we set up our view like we do on viewDidLoad. For example:
    [self.view addSubview:self.doneButton];

  • (void)post
    [super post];

    //After we setup the views, we want to bind our view model against
    //them, this is where all that magic goes. For example:
    RAC(self.doneButton, userInteractionEnabled) =
    RACObserve(self.viewModel, doneEnabled);

  • Now just instantiate your view controller with the model and you’re done:
    MYViewModel *vm = [[MYViewModel alloc] init];
    MYViewController *vc = [[MYViewController alloc] initWithViewModel:vm];

Okay, now can I get a real example?

rprtr should be a good resource, this project was developed against it.

What about installing the framework?

You can build it as a regular framework, but I recommend using CocoaPods:

pod 'iodine'

Currently supported UIKit classes

  • UIViewController (IOViewController)
  • UITableViewController (IOTableViewController)
  • UITableHeaderFooterView (IOTableHeaderFooterView)
  • UITableViewCell (IOTableViewCell)

Latest podspec

    "name": "iodine",
    "version": "0.1.1",
    "summary": "iodine is a Reactive MVVM framework base on ReactiveCocoa",
    "homepage": "",
    "license": "MIT",
    "authors": {
        "Karolis Stasaitis": "[email protected]"
    "source": {
        "git": "",
        "tag": "0.1.1"
    "platforms": {
        "ios": "7.1"
    "requires_arc": true,
    "source_files": "iodine/",
    "dependencies": {
        "ReactiveCocoa": [],
        "ReactiveViewModel": []

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