Multiple collectionviews in one Viewcontroller causes Index out of range error - ios

Question

I try to use three collectionviews in one Viewcontroller. I parse the data like the following method shows:
At the bottom i add the data depending on the position to the right list (this part works)
func getEventData(eventIDs: [String], plz: String, positiona: Int){
for eventId in eventIDs {
let ref = Database.database().reference().child("Events").child(plz).child(eventId)
ref.observe(.value, with: { snapshot in
let item = snapshot.value as? [String: AnyObject]
let eventName = item?["name"] as! String
let date = item?["date"] as! String
let lat = item?["lat"] as! String
let lng = item?["lng"] as! String
let infos = item?["additionalInfos"] as! String
let position = item?["position"] as! String
let ts = item?["ts"] as! Int
let createdBy = item?["createdBy"] as! String
let timestamp = NSDate().timeIntervalSince1970
if (ts > Int(timestamp)) {
let eo = EventObject(eventID: eventId, eventName:
eventName, info: infos, createdBy: createdBy, date: date, lat: lat, lng: lng, position: position, ts: ts)
if positiona == 0{
self.acceptedEvents.append(eo)
self.acceptedEventscv.reloadData()
}else if positiona == 1{
self.myEvents.append(eo)
self.myEventscv.reloadData()
}else if positiona == 2{
self.storedEvents.append(eo)
self.storedEventscv.reloadData()
}
}
})
}
}
In my NumbersofItemsInSection method i did the following which works as well:
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == self.acceptedEventscv{
return acceptedEvents.count
}else if collectionView == self.storedEventscv{
return storedEvents.count
}else if collectionView == self.myEventscv{
return myEvents.count
}else{
return 0
}
}
and in my CellForRowAtItem method i tried the following
func collectionView(_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.acceptedEventscv{
let cell =
collectionView.dequeueReusableCell(withReuseIdentifier:
"acceptedEventsCell", for: indexPath) as!
acceptedEventsCollectionViewCell
let eo = acceptedEvents[indexPath.row]
cell.eventName.text = eo.eventName
let items = eo.date!.components(separatedBy: " ")//Here replase
space with your value and result is Array.
//Direct line of code
//let items = "This is my String".components(separatedBy: " ")
let date = items[0]
let time = items[1]
cell.date.text = date
cell.time.text = time
getUserNameAge(label: cell.usernameAge)
return cell
}else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "savedEventsCell", for: indexPath) as! savedEventsCollectionViewCell
let eo = acceptedEvents[indexPath.row]
cell.eventName.text = eo.eventName
let items = eo.date!.components(separatedBy: " ")//Here replase space with your value and result is Array.
//Direct line of code
//let items = "This is my String".components(separatedBy: " ")
let date = items[0]
let time = items[1]
cell.date.text = date
cell.time.text = time
getUserNameAge(label: cell.usernameAge)
return cell
}
}
The problem is if i have more items in the seccond CollectionView, i always get this error:
Thread 1: Fatal error: Index out of range
at this line of code:
let eo = acceptedEvents[indexPath.row]

Answer 1

cellForItemAt also must be like
if collectionView == self.acceptedEventscv{
let item = acceptedEvents[indexPath.row]
----
return cell
}else if collectionView == self.storedEventscv{
let item = storedEvents[indexPath.row]
----
return cell
}else {
let item = myEvents[indexPath.row]
----
return cell
}
what happens now in your case is that you access the same array acceptedEvents in both cases where the returned count in numberOfItemsInSection may be different