ComponentDelegate is nil

[iAlirezaKML]

The function func component(_ component: Component, itemSelected item: Item) is not get called, since the component.delegate in line 65 of Delegate+iOS+Extensions.swift is nil.

[zenangst]

Hey @iAlirezaKML, mind sharing some more information about your implementation? Do you use standalone components or do you have a controller-centric setup? And at what time do you set your delegate?

[iAlirezaKML]

Hi @zenangst, of course, here's an implementation:

import UIKit
import Spots


enum KBComponentKind: String, StringConvertible {
  var string: String {
    return rawValue
  }
  
  case contactView
}


class ContactView: UIView {
  let titleLabel: UILabel = {
    let label = UILabel.init()
    label.textAlignment = .center
    label.textColor = .gray
    return label
  }()
  
  override init(frame: CGRect) {
    super.init(frame: frame)

    addSubview(titleLabel)
  }
  
  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
  
  override func layoutSubviews() {
    super.layoutSubviews()
    
    titleLabel.frame = frame
  }
}

extension ContactView: ItemConfigurable {
  func configure(with item: Item) {
    titleLabel.text = item.title
  }
  
  func computeSize(for item: Item, containerSize: CGSize) -> CGSize {
    return CGSize.init(width: containerSize.width,
                       height: 44)
  }
}


class Delegator: NSObject {}

extension Delegator: ComponentDelegate {
  func component(_ component: Component, itemSelected item: Item) {
    print(#function) // not called!!!
    print(component, item)
  }
  
  func component(_ component: Component, willDisplay view: ComponentView, item: Item) {
    print(#function) // called!
    if item.kind == KBComponentKind.contactView.rawValue {
      view.transform = CGAffineTransform.init(scaleX: 0.01, y: 0.01)
      view.alpha = 0
      UIView.animate(withDuration: 0.8, delay: 0.1, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.3, options: [.curveEaseOut], animations: {
        view.alpha = 1
        view.transform = CGAffineTransform.identity
      }, completion: nil)
    }
  }
  
  func component(_ component: Component, didEndDisplaying view: ComponentView, item: Item) {
    print(#function) // called!
  }
}


@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  var window: UIWindow?
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let window = UIWindow.init(frame: UIScreen.main.bounds)
    self.window = window

    Configuration.shared.register(view: ContactView.self, identifier: KBComponentKind.contactView)
    Configuration.shared.registerDefault(view: ContactView.self)
    let model = ComponentModel.init(
      kind: .grid,
      layout: Layout.init(span: 3,
                          dynamicSpan: false,
                          dynamicHeight: false,
                          itemsPerRow: 3,
                          itemSpacing: 1,
                          lineSpacing: 1,
                          inset: Inset.init(padding: 12),
                          showEmptyComponent: false,
                          infiniteScrolling: false),
      items: [
        Item(title: "Sindre Moen", kind: "contactView"),
        Item(title: "Torgeir Øverland", kind: "contactView"),
        Item(title: "Francesco Rodriguez", kind: "contactView"),
        Item(title: "Henriette Røseth", kind: "contactView"),
        Item(title: "Peter Sergeev", kind: "contactView"),
        Item(title: "John Terje Sirevåg", kind: "contactView"),
        Item(title: "Chang Xiangzhong", kind: "contactView")
      ]
    )
    let component = Component.init(model: model)
    let controller = SpotsController.init(components: [component])
    let delegator = Delegator.init()
    controller.delegate = delegator

    window.rootViewController
    window.makeKeyAndVisible()

    return true
  }
}

[iAlirezaKML]

I've got the problem, since in my implementation there is no strong references hold for delegator object, and spots just holds a weak reference to the component delegate, after components are being created, the delegator is not being referenced by any strong variable and it's being pulled out of memory.

Fixed it by holding an strong reference in AppDelegate.

P.S.: Please update the documentation, there are a ton of changes made and has not been reflected to the docs. By the way live editing doesn't work and gets compile errors.

Another question: how can I access to the selected view inside of component(_ component: Component, itemSelected item: Item) to animate on selection?