Dealing with index out of bounds in SWIFT in tableview cell - swift

Question

Language : Swift , REALM, Working with tableview cells to display user entries.
I have a problem where I cannot figure out how to display images in a table view cell where each cell has different number of images coming in and the images itself are optional when the user saves their entry.
here is my problem - When I create a new image view in my stack view as you see in the code, to display the second image in the list, I am getting the error that the index path is out of bounds. Also, I cannot unwrap the journalAspects.inPictures[0].realmToThumbNailImage() because I get an error saying that it is not optional.
How do I go about solving this problem of showing different number of images in different cells with out crashing the app.
I have 3 user entries in my app
1st one has text, date and no images
2nd one has text, date and 1 image
3rd one has text, date and 2 images
here is what I want to see in my table view cell
first cell with just text and date
second cell with text, date and 1 image
third cell with text, date and 2 images
Thank you very much and your input is highly appreciated.
here is my code :
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let displayCell = journalAspectTableViewDispay.dequeueReusableCell(withIdentifier: "firstAddCell", for: indexPath) as! FirstAddTableViewCell
if let journalAspects = RealmEntries?[indexPath.row] {
//MARK: Text display
displayCell.journalTextDisplayLabel.text = journalAspects.realmText
let pictureImageView = UIImageView()
pictureImageView.heightAnchor.constraint(equalToConstant: 70).isActive = true
pictureImageView.widthAnchor.constraint(equalToConstant: 70).isActive = truedisplayCell.stackViewForImageShow.addArrangedSubview(pictureImageView)
let secondpictureImageView = UIImageView()
secondpictureImageView.heightAnchor.constraint(equalToConstant: 70).isActive = true
secondpictureImageView.widthAnchor.constraint(equalToConstant: 70).isActive = true
displayCell.stackViewForImageShow.addArrangedSubview(secondpictureImageView)
if journalAspects.inPictures.count == 0 {
return displayCell
} else {
let imagesComingOut = journalAspects.inPictures[0].realmToThumbNailImage()
secondpictureImageView.image = imagesComingOut
let secondimagesComingOut = journalAspects.inPictures[1].realmToThumbNailImage() -- App crashes
pictureImageView.image = secondimagesComingOut -- App crashes
}
}
return displayCell
}
Hi, Thank you for your feedback, It is working, But when I implement it, I am having a strange problem. As I add new entries, the number of rows in the section won't change, and weird things happen. At first as I run and compile the app from the Xcode, everything seems right. Entries with one image has one image, entries with no image has no image and entries with 2 has 2. But as I scroll up and down, suddenly entries with no image gets populated with some image. Even though, I have added a new entry, the number of rows will still return the same. For instance if I have 10 entries at the start by running the compiler on the Xcode, then I add the 11th entry, as I scroll, the table view adds the 11th entry as 10th and knocks out the first entry. No matter how many I add, they just knock one down and add another at the top making the number of rows I see as a constant number since it is compiled. If you have any idea as to why that is happening, Please let me know Thank you again.

Answer 1

Have you checked that inPictures actually contains 2 images? You check that there's greater than 0, but not > 1. That can be the only reason for an out of range error in that line. A safer way would be:
switch journalAspects.inPictures.count {
case 2:
secondpictureImageView.image = journalAspects.inPictures[0].realmToThumbNailImage()
pictureImageView.image = journalAspects.inPictures[1].realmToThumbNailImage()
case 1:
pictureImageView.image = journalAspects.inPictures[1].realmToThumbNailImage()
// or maybe the other one - hard to tell as you've mixed up sequencing
default: break
}
return displayCell