HotReloadable

Being able to hot reload views with injection injectionforxcode.com is plain amazing. The Injection plugin works perfect out of the box but there is still a bit of code we need to write.

When our view file gets saved and injected, we actually need to manually reload the View in our ViewController in order to see the change on screen. the following is a snippet that makes this process easier 😎

Turn this:

class ViewController: UIViewController {
    
    var v = View()
    override func loadView() { view = v }
    
    convenience init() {
        self.init(nibName: nil, bundle: nil)
        NotificationCenter.default.addObserver(forName:
            NSNotification.Name(rawValue:"INJECTION_BUNDLE_NOTIFICATION"),
                                               object: nil,
                                               queue: .main) { [weak self] _ in
                                                self?.v = View()
                                                self?.view = self?.v
                                                self?.viewDidLoad()
        }
    }
}

into

class ViewController: UIViewController, HotReloadable {
    
    var v = View()
    override func loadView() { view = v }
    
    convenience init() {
        self.init(nibName: nil, bundle: nil)
        enableHotReload(on: \ViewController.v)
    }
}

The magic :

protocol HotReloadable { }

extension HotReloadable where Self: UIViewController {
    
    func enableHotReload<V: UIView>(on viewProperty: ReferenceWritableKeyPath<Self, V>) {
        let nc = NotificationCenter.default
        nc.addObserver(
            forName:NSNotification.Name(rawValue:"INJECTION_BUNDLE_NOTIFICATION"),
            object: nil,
            queue: .main) { _ in
                self[keyPath: viewProperty] = V()
                self.view = self[keyPath: viewProperty]
                self.viewDidLoad()
        }
    }
}

s4cha/HotReloadable

HotReloadable