Добрый день
Я загружаю данные из parse.com в UICollectionView. текстовые данные отображаются хорошо. но картинки прыгают из ячейки в ячейку.
Вот видео бага:
https://www.youtube.com/watch?v=9XhFj0br1DE&featur...CatalogViewController.swiftclass CatalogViewController: UIViewController, UICollectionViewDataSource, DataProviderProtocol, UICollectionViewDelegate {
@IBOutlet weak var collectionView: UICollectionView!
var isLoad = false
var loadImageCounter: Int = 0
let cellPerPage = 10
var itemGroupData:ItemGroupDataProvider!
override func viewDidLoad() {
super.viewDidLoad()
// Set provider
itemGroupData = ItemGroupDataProvider()
itemGroupData.delegate = self
itemGroupData.loadData(objectCount: cellPerPage)
// First load
self.isLoad = true
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return itemGroupData.countObjects();
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
var cell: ItemCollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("ItemViewCell", forIndexPath: indexPath) as ItemCollectionViewCell;
let itmGrp:ItemGroupModel = itemGroupData.objectAtIndex(indexPath.row)
cell.titleLable.text = itmGrp.title
cell.itemGroupModel = itmGrp
if( itmGrp.icon != nil){
cell.imagePFFile = itmGrp.icon
itmGrp.icon!.getDataInBackgroundWithBlock { (data, error) -> Void in
if error == nil && data != nil && data.length > 0 {
cell.smallImageView.image = UIImage(data:data!)
}
}
}
return cell;
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
let cell: ItemCollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("ItemViewCell", forIndexPath: indexPath) as ItemCollectionViewCell;
}
func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {
if isLoad == true || loadImageCounter > 0 {
return
}
if indexPath.item + 1 == itemGroupData.countObjects() && isLoad == false{
isLoad = true
itemGroupData.fetchNext(objectCount: cellPerPage)
}
}
func didLoadData(dataProvider:ItemGroupDataProvider) {
//self.tableView.reloadData()
self.collectionView.reloadData();
self.isLoad = false
}
ItemGroupDataProvider.swiftprivate let defaultObjectCountLimit = 10
private let maximumTotalCount = 1000
protocol DataProviderProtocol : class{
func didLoadData(dataProvider:ItemGroupDataProvider)
class ItemGroupDataProvider {
private var itemGroupSerivice:ItemGroupService = ItemGroupService()
weak var delegate:DataProviderProtocol?
private var result:[ItemGroupModel] = [ItemGroupModel]()
private(set) var totalCount:Int = 0
private(set) var allItems:Int = 0
func countObjects() -> Int {
return result.count
}
func objectAtIndex(index:Int) -> ItemGroupModel {
assert(index > -1 , "Index out of bounds")
assert(index < result.count, "Index out of bounds")
return result[index]
}
init(){
}
/**
First load data
*/
func loadData(objectCount limit:Int = defaultObjectCountLimit){
totalCount = maximumTotalCount
self.fetchFromService(limit, skip: result.count)
}
/**
Next page load
:param: limit Limit the number of objects for query
*/
func fetchNext(objectCount limit:Int = defaultObjectCountLimit) {
self.fetchFromService(limit, skip: result.count)
}
/**
Load from server. Parameters limit and skip provide pagination and дщсфешщт
:param: limit Limit the number of objects for query
:param: skip Skip objects
*/
private func fetchFromService(limit:Int, skip:Int){
self.itemGroupSerivice.searchItemGroups(limit, skip: skip) {
(objects,error) in
if error == nil {
if objects != nil && objects!.count > 0 {
self.result.extend(objects!)
} else{
self.totalCount = self.result.count
}
} else {
//TODO: error handle
}
self.delegate?.didLoadData(self)
}
}
