Change Element Value outside TableView Scope - ios

Question

i have a TableView with a customCell. I set the values of the customCell Elements inside cellForRowAtIndexPath:. No problem. But i want to change some customCell Element Values outside of the cellForRowAtIndexPath: Scope. For example after a Swipe i want to change the Value of a cell element inside my swipe function
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
let cell:customCell = self.tableView?.dequeueReusableCellWithIdentifier("customCell")! as customCell
let rowData: NSDictionary = self.tableData[indexPath.row] as NSDictionary
let imageSwipeLeft = UISwipeGestureRecognizer(target: self, action: "imageSwiped:")
imageSwipeLeft.direction = .Left
let urlString: NSString = rowData["testImage"] as NSString
self.indexPathArray += [indexPath]
cell.testLabel.text = "Test Label"
cell.testImage.image = image
cell.testImage.tag = indexPath.row
cell.testImage.addGestureRecognizer(imageSwipeLeft)
cell.testImage.userInteractionEnabled = true
ImageLoader.sharedLoader.imageForUrl(urlString, completionHandler:{(image: UIImage?, url: String) in
cell.testImage.image = image
cell.testImage.layer.borderWidth = 6;
cell.testImage.layer.borderColor = UIColor.whiteColor().CGColor
cell.testImage.clipsToBounds = true
cell.placeholderLoading.stopAnimating()
})
return cell
}
func imageSwiped(recognizer: UISwipeGestureRecognizer) {
let testData: NSDictionary = self.tableData[recognizer.view.tag] as NSDictionary
let imageSlide = recognizer.view as UIImageView
var imageURL = testData["image"] as String
ImageLoader.sharedLoader.imageForUrl(imageURL, completionHandler:{(image: UIImage?, url: String) in
UIView.transitionWithView(imageSlide,
duration:0.44,
options: .TransitionCrossDissolve,
animations: { imageSlide.image = image },
completion: nil)
})
let indexPath = self.indexPathArray[recognizer.view.tag] as NSIndexPath
let cell = self.tableView?.cellForRowAtIndexPath(indexPath)as customCell
cell.testLabel.text = "Test"
}

Answer 1

UITableView follows the Model-View-Controller pattern. According to this pattern, all your changes need to be done to the model - in other words, to the data structure that stores the information from which you populate your cell data. Once you made the change to the model, you tell the view that the data has changed, which would then show the new data.
Let's say that your cellForRowAtIndexPath function reads from an array. Your imageSwiped function should then locate the item that has been swiped, modify its entry in the array, and call either reloadData or reloadRowsAtIndexPaths.
That's it! Once you notify the table view of the reload, it would go back to the array, find the modified data, and call your cellForRowAtIndexPath to display it.
Specifically, in your code add an array called swipedCells to the same class where you declared tableData array:
var swipedCells = Boolean[](count:self.tableData.count, repeatedValue: false)
Now replace
cell.testLabel.text = "Test Label"
line with
if self.swipedCells[indexPath.row] {
cell.testLabel.text = "Swiped!"
} else {
cell.testLabel.text = "Test Label"
}
Finally, change the imageSwiped as follows:
let indexPathRow = self.indexPathArray[recognizer.view.tag] as Int
self.swipedCells[indexPathRow] = true
self.tableView?.reloadData()
This way the cells that you have swiped would continue to have a label "Swiped!" even after you scroll.

Answer 2

Ok after a huge amount of hours :D i solved my problem.
let indexPath = self.priceObjects[recognizer.view.tag] as NSIndexPath
let cell = self.tableView?.cellForRowAtIndexPath(indexPath)as customCell
i call this inside my imageSwipe function. Inside the cellForRowAtIndexPath function where i set the initial cell element values i store the indexPath inside an array. An i tag the Images to get a Index if the Swipe Events happens. I think it is far away from the ideal way...but works for me. I hope someday someone post the good way ;) cause this is very quick n' dirty.