Reuse item inside a row when scrolling

<ListView ScrollViewer.CanContentScroll="False" ... />

// solve problem 2
[self.collectionView registerClass:[UICollectionViewCell class] forReuseIdentifer:@"FlickrCell"];

UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"FlickrCell" forIndexPath:indexPath];
cell.backgroundColor = [self generateRandomUIColor];

// solve problem 1 by looking in the contentView for your subview (and looping instead of assuming at 0)
PFImageView *pfImageView = nil;
for (UIView *subview in cell.contentView.subviews)
{
    if ([subview isKindOfClass:[PFImageView class]])
    {
        pfImageView = (PFImageView *)subview;
        break;
    }
}

NSURL *staticPhotoURL = [self.context photoSourceURLFromDictionary:[self.photos objectAtIndex:indexPath.row] size:OFFlickrSmallSize];    
if (pfImageView == nil)
{
    // No PFImageView, create one
    // note the use of contentView!
    pfImageView = [[PFImageView alloc] initWithFrame:CGRectMake(0, 0, cell.contentView.frame.size.height, cell.frame.size.width) andImageURL:staticPhotoURL andOwningCell:cell.contentView];
    [cell.contentView addSubview:pfImageView];
}
else
{
    // Already have recycled view.
    // need to reset the url for the pfImageView. (Problem 3)
    // not sure what PFImageView looks like so this is an e.g. I'd probably remove the
    // URL loading from the ctr above and instead have a function that loads the
    // image. Then, you could do this outside of the if, regardless of whether you had 
    // to alloc the child view or not.
    [pfImageView loadImageWithUrl:staticPhotoURL];
    // if you really only have 200 static images, you might consider caching all of them
}
return cell;

public MainPage()
{
   InitializeComponent();
   myPivot.IsHitTestVisible = false; // disable your Pivot
   Touch.FrameReported += Touch_FrameReported;
   TouchPanel.EnabledGestures = GestureType.HorizontalDrag; 
}

TouchPoint first;
private const int detectRightGesture = 20;

private void Touch_FrameReported(object sender, TouchFrameEventArgs e)
{
    TouchPoint mainTouch = e.GetPrimaryTouchPoint(this);
    if (mainTouch.Action == TouchAction.Down)
        first = mainTouch;
    else if (mainTouch.Action == TouchAction.Up && TouchPanel.IsGestureAvailable)
    {
        if (mainTouch.Position.X - first.Position.X < -detectRightGesture)
        {
            if (myPivot.SelectedIndex < myPivot.Items.Count - 1)
                myPivot.SelectedIndex++;
        }
        else if (mainTouch.Position.X - first.Position.X > detectRightGesture)
        {
            if (myPivot.SelectedIndex > 0)
                myPivot.SelectedIndex--;
        }
    }
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyCell *cell = (MyCell*)[cv dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];

    cell.labelTitle.text = [_editionNameArray objectAtIndex:indexPath.row];
    cell.labelIssue.text = [[[_editionDescriptionArray objectAtIndex:indexPath.row]
                         stringByReplacingOccurrencesOfString:@"+" withString:@" "]
                        stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSNumber* progress = [_downloadProgressArray objectAtIndex:indexPath.row];
    if (progress == nil) {
        // download not started
        cell.issueButton.hidden = NO;
        cell.issueButton.tag = indexPath.row;
        [cell.issueButton setTitle:@"Download" forState:UIControlStateNormal]; //once the download is completed set the title as Read.
        [cell.issueButton addTarget:self action:@selector(downloadTheIssue:) forControlEvents:UIControlEventTouchUpInside];
        cell.progressView.hidden = YES;
    } else {
        cell.issueButton.hidden = YES;
        cell.progressView.hidden = NO;
        cell.progressView.progress = progress.doubleValue;
    }

    cell.tag = indexPath.row;
    return cell;
}


- (void)downloadManager:(DownloadManager *)downloadManager downloadDidReceiveData:(Download *)download
{
    _downloadProgressArray[download.tag] = [NSNumber numberWithDouble:(your progress here)];
    [self updateProgressViewForIndexPath:[NSIndexPath indexPathForRow:download.tag inSection:0] download:download];
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorPrimary">

        <TextView
            android:id="@+id/toolbarTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/check_in_information"
            android:textColor="@color/white"
            android:textSize="18sp" />

    </android.support.v7.widget.Toolbar>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/studyListRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        app:layout_constraintTop_toBottomOf="@id/toolbar"
        app:layout_constraintBottom_toTopOf="@+id/closeButton"
        android:layout_marginBottom="16dp">

    </android.support.v7.widget.RecyclerView>

    <Button
        android:id="@+id/closeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/custom_button"
        android:textColor="@color/buttonTextColor"
        android:text="@string/close"
        android:layout_marginBottom="8dp"
        android:layout_gravity="center"/>

</LinearLayout>