ObservableField

Field binding for MVVM

TODO:

• Track buildChanges in adapter and use performBatchUpdates(_:completion:)
• Differ for lists
• Support GRDB, observe table
• Support CoreData, observe table

How to use?

Cancelable and CancelContainer.

Cancelable is a basic protocol that helps clear object references. CancelContainer is the mechanism that stores and notifies Cancelable objects. Calls Cancelable.cancel during deincilization to clear references.

ControlProperty and ControlAction.

ControlProperty is an object for tracking changes and inserting new values. ControlAction is an object for tracking actions.

You can bind objects in three ways:

• -->: Data is only sent from the View.
• <--: Data is only sent from the code.
• <->: Data can be sent from View and code.

ViewModel

let observableSearch = ObservableField<String?>(nil)

ViewController

@IBOutlet weak var searchBar: UISearchBar!
    
override func viewDidLoad() {
    super.viewDidLoad()
    // binding object
    cancelContainer.activate([
        searchBar.searchTextField.observableText --> viewModel.observableSearch
    ])
}

Bind UITableView and UICollectionView

ViewModel

let observableArray = ObservableArray<String>()

ViewController

@IBOutlet weak var tableView: UITableView!
    
override func viewDidLoad() {
    super.viewDidLoad()
    // init adapter for UITableView 
    // Pass a reference to `UITableView`
    // Pass the data source
    // And set the display of the cell.
    adapter = UITableViewClosureAdapter(
        tableView,
        observableDataSource: viewModel.observableArray,
        cellForRowHandler: { tableView, indexPath, row in
            let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
            cell.textLabel?.text = row
            return cell
        },
        titleForHeaderSectionHandler: nil,
        titleForFooterSectionHandler: nil,
        numberOfSectionsHandler: nil,
        numberOfItemsInSectionHandler: nil
    )
    tableView.dataSource = adapter
    // Finally, pass the adapter to `CancelContainer` to clean up links automatically.
    cancelContainer.activate([
        adapter
    ])
}