IGListKit insert data to class from Alamofire request - ios

Question

So i have this model
class Event: NSObject {
var _eventName: String!
var _venueName : String!
var _eventImage: String!
var eventName: String {
if _eventName == nil {
_eventName = ""
}
return _eventName
}
var venueName: String {
if _venueName == nil {
_venueName = ""
}
return _venueName
}
var eventImage: String {
if _eventImage == nil {
_eventImage = ""
}
return _eventImage
}
init(eventsDict: Dictionary<String, AnyObject>) {
if let venue = eventsDict["venue"] as? Dictionary<String, AnyObject> {
if let venuname = venue["name"] as? String{
self._venueName = venuname
}
if let eventname = eventsDict["name"] as? String {
self._eventName = eventname
}
if let eventimage = eventsDict["coverPicture"] as? String {
self._eventImage = eventimage
}
}
}
And i make it IGListDiffable with this extension.
extension NSObject: IGListDiffable {
public func diffIdentifier() -> NSObjectProtocol {
return self
}
public func isEqual(toDiffableObject object: IGListDiffable?) -> Bool {
return isEqual(object)
}
}
So when I'm loading data from hardcoded code like this
var entries = [Event]()
func loadFakeEvents() {
let entries = [
Event(
eventName: "Ζωρζ Πιλαλι Και Η Soufra Band Στο AN Groundfloor - Live Stage!",
venueName: "AN Groundfloor - live stage",
eventImage: "https://scontent.xx.fbcdn.net/v/t31.0-8/s720x720/15936729_1867160333520142_8855370744955080264_o.jpg?oh=8198bc10a8ea61011d7ec1902b34aa01&oe=593D6BC4"
),
Event(
date: "2017-02-18T21:30:00+0200",
name: "Διονύσης Σαββόπουλος at Gazarte I Main Stage 18/02",
venuename: "Gazarte",
eventImage: "https://scontent.xx.fbcdn.net/v/t1.0-9/s720x720/16265335_1262826863809003_3636661375515976849_n.jpg?oh=5bb342321a65d33dbc1cc41de266b45e&oe=5907857C"
)
]
self.entries = entries
}
The events are loading fine. As they have to.
But when i'm making an alamofire request, of course, it takse some time to load the data and append them to the empty array of events.
This is the function that I have to call the events
func loadEvents() {
let parameters: Parameters = [
"Some" : "Parameters",
"Some" : "Parameters"
]
Alamofire.request(baseurl, method: .get, parameters: parameters)
.responseJSON { (responseData) -> Void in
if((responseData.result.value) != nil) {
let result = responseData.result
if let dict = result.value as? Dictionary<String, AnyObject>{
print(dict) // <-- Check this out
if let list = dict["events"] as? [Dictionary<String, AnyObject>] {
for obj in list {
let event = Event(eventsDict: obj)
self.entries.append(event)
}
}
}
}
}
}
So in the above code i have a print, which prints the json.
And in my
extension LocationViewController: IGListAdapterDataSource {
func objects(for listAdapter: IGListAdapter) -> [IGListDiffable] {
let items: [IGListDiffable] = loader.entries as [IGListDiffable]
print(items.count) // <--- another print of items that should be displayed
return items
}
func listAdapter(_ listAdapter: IGListAdapter, sectionControllerFor object: Any) -> IGListSectionController {
return NormalSectionController()
}
func emptyView(for listAdapter: IGListAdapter) -> UIView? { return nil }
}
Adapter i also print the items that should be displayed.
So when i load the fakeEvents function it prints 2 but when i load them with the normal function it prints 0 and then the JSON from the dict var from the previous code.
Normally i would reloadData() of the collection view.
But with IGListKit what is the trick of sending the Event Class to the CollectionView?
Thanks a lot for your time and i hope i'm not off topic !

Answer 1

Pasting my answer from this same issue on Github in case anyone finds this.
https://github.com/Instagram/IGListKit/issues/468
It looks like you're missing a call to self.adapter.performUpdates(animated: true) after the for-loop when appending to the entries dict:
func loadEvents() {
// ...
Alamofire.request(baseurl, method: .get, parameters: parameters)
.responseJSON { (responseData) -> Void in
if responseData.result.value != nil {
let result = responseData.result
if let dict = result.value as? Dictionary<String, AnyObject>{
if let list = dict["events"] as? [Dictionary<String, AnyObject>] {
for obj in list {
let event = Event(eventsDict: obj)
self.entries.append(event)
}
// missing this!
self.adapter.performUpdates(animated: true)
// missing that!
}
}
}
}
}