I have a table view which loads custom table view cells. In the table view cell I have an image view, among other controls. The problem is that the table view stutters while scrolling, even though the images are being read from Cache or documents directory (using either isn't making any difference)
Here is the code for displaying the table view cell:
func tableView(tableView: UITableView,
willDisplayCell cell: UITableViewCell,
forRowAtIndexPath indexPath: NSIndexPath) {
if cell.isKindOfClass(EventsTableViewCell) {
let eventCell = cell as! EventsTableViewCell
let list = self.eventsList
if list.count > 0 {
let event = list.objectAtIndex(indexPath.row) as! Event
//other cell labels configured here
//imageCache is NSCache instance
if let imageData = self.imageCache.objectForKey(event.name) as? NSData {
let image = UIImage(data: imageData)
eventCell.eventImageView.image = image
}
else if event.imageUrl != "" {
eventCell.setImageToCell(event)
}
}
}
}
func tableView(tableView: UITableView,
cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "eventCell"
var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier)
if cell == nil {
let nibCollection = NSBundle.mainBundle().loadNibNamed("EventsTableViewCell",
owner: nil,
options: nil)
cell = (nibCollection as NSArray).objectAtIndex(0) as? EventsTableViewCell
}
cell?.selectionStyle = .None
return cell!
}
In EventsTableViewCell,
func setImageToCell(event: Event) {
//apply placeholder image. This image will be replaced if an image is found for the particular event.
if event.image != nil {
dispatch_async(dispatch_get_main_queue(), {
self.eventImageView.image = event.image
})
}
}
So even though none of the images are being downloaded here, the table view still can't handle the scrolling properly. I am not sure what I am doing wrong. Can the size of the images be an issue here?
