Cannot load data from Parse in PFQueryCollectionViewController Swift iOS - ios

Question

I have problems loading Data from Parse into my PFQueryCollectionViewController. This is my WaterfallFeedCollectionViewController Class:
import UIKit
import Parse
class WaterfallFeedCollectionViewController: PFQueryCollectionViewController, CollectionViewWaterfallLayoutDelegate {
#IBOutlet var theCollectionView: UICollectionView!
//Random high Cells
lazy var cellSizes: [CGSize] = {
var _cellSizes = [CGSize]()
for _ in 0...20 {
let random = Int(arc4random_uniform((UInt32(100))))
_cellSizes.append(CGSize(width: 140, height: 150 + random))
}
return _cellSizes
}()
init!(style: CollectionViewWaterfallLayout, className: String!) {
super.init(collectionViewLayout: style, className: className)
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
// Configure the PFQueryCollectionView
self.parseClassName = "foodEntry"
self.pullToRefreshEnabled = true
self.paginationEnabled = true
self.objectsPerPage = 15
}
override func queryForCollection() -> PFQuery {
var query = PFQuery(className: "foodEntry")
query.orderByAscending("createdAt")
return query
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let layout = CollectionViewWaterfallLayout()
layout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
layout.headerInset = UIEdgeInsetsMake(0, 0, 0, 0)
layout.headerHeight = 0
layout.footerHeight = 0
layout.minimumColumnSpacing = 10
layout.minimumInteritemSpacing = 10
theCollectionView.collectionViewLayout = layout
theCollectionView.registerClass(UICollectionReusableView.self, forSupplementaryViewOfKind: CollectionViewWaterfallElementKindSectionHeader, withReuseIdentifier: "Header")
theCollectionView.registerClass(UICollectionReusableView.self, forSupplementaryViewOfKind: CollectionViewWaterfallElementKindSectionFooter, withReuseIdentifier: "Footer")
}
override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
//Zelle
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath, object: PFObject) -> PFCollectionViewCell {
var cell = theCollectionView.dequeueReusableCellWithReuseIdentifier("myWaterfallCell", forIndexPath: indexPath) as myWaterfallCollectionViewCell
cell.FoodNameLabel.text = object["FoodName"] as? String
var text = object["FoodName"] as? String
println("\(text) funktioniert")
return cell
}
override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
var reusableView: UICollectionReusableView? = nil
if kind == CollectionViewWaterfallElementKindSectionHeader {
reusableView = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "Header", forIndexPath: indexPath) as? UICollectionReusableView
if let view = reusableView {
view.backgroundColor = UIColor.redColor()
}
}
else if kind == CollectionViewWaterfallElementKindSectionFooter {
reusableView = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "Footer", forIndexPath: indexPath) as? UICollectionReusableView
if let view = reusableView {
view.backgroundColor = UIColor.blueColor()
}
}
return reusableView!
}
// MARK: WaterfallLayoutDelegate
override func collectionView(theCollectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return cellSizes[indexPath.item]
}
}
It always returns nil. The documentation of Parse is really bad concerning the CollectionView. I found a sample project and tried to get it out with it and the way they load the data in the PFQueryTableView. The pull to refresh works so i guess its going the right way.

Answer 1

The code above actually works. There was just a Problem with the ParseUI framework which i now added via pods.