Showing cells in demands in UICollectionView with vertical infinite scroll

Question

I would like to know how to achieve using a UICollectionView the desired effect of loading in demand like in the Amazon app when you make a sea

Answer 1

I am also working on infinity scroll on UICollectionView. Here is the function which you need.

func scrollViewDidScroll(scrollView: UIScrollView) {
    let offsetY = scrollView.contentOffset.y
    let contentHeight = scrollView.contentSize.height
    if offsetY > contentHeight - scrollView.frame.size.height {
        println("this is end, see you in console")
    }
}

And you can write your code in if clause. reloadData() I think.

// load data for collection view
func loadGroundData(){
    AVCloud.callFunctionInBackground("GroundWaterFallList", withParameters: [:]) {
        (result: AnyObject!, error: NSError!) -> Void in
        if error == nil {
            NSLog("ground users count: \(result.count)")
            NSLog("\(result[0])")
            self.ground_water_fall_people = result as NSArray
            self.collectionView?.reloadData()
        }
    }
}

well, I am still working on it, hope this help. And hope someone can explain these two functions. collectionView(collectionView: UICollectionView, didEndDisplayingCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) scrollViewDidScroll