Custom UITableViewCell with optionals - swift

Question

I'm creating custom cell for my tableView. I made a swift file:
import Foundation
import UIKit
class CellForPost: UITableViewCell {
#IBOutlet weak var postLikes: UILabel!
#IBOutlet weak var postText: UILabel!
#IBOutlet weak var postDate: UILabel!
#IBOutlet weak var postPhoto: UIImageView!
}
and implemented it in delegate method:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("postCell", forIndexPath: indexPath) as! CellForPost
cell.postPhoto.image = UIImage.init(data: (posts[indexPath.item].postPhoto)! as NSData)
cell.postText.text = posts[indexPath.item].postText
cell.postLikes.text = String(posts[indexPath.item].postLikes!)
cell.postDate.text = timestampToDate(posts[indexPath.item].postDate!)
return cell
}
everything works great when post has full content, but when for example there is no photo(which is optional in post struct) it crashes with message
fatal error: unexpectedly found nil while unwrapping an Optional value
I understand this message, so I tried to make
#IBOutlet weak var postPhoto: UIImageView?
like an optional value, but it doesn't work, 'cos compiler wants me to unwrap values before inserting to cell.
P.S. If it's possible to give a short advice about deleting imageView at all when it is nil and resize row height to fit.

Answer 1

You don't need touch your outlets declarations, you need check for nil in cellForRowAtIndexPath method (and setup nil as value thought)
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("postCell", forIndexPath: indexPath) as! CellForPost
var image: UIImage? = nil
if let imageData = posts[indexPath.item].postPhoto {
image = UIImage.init(data: imageData)
}
cell.postPhoto.image = image
cell.postText.text = posts[indexPath.item].postText
var postLikes: String? = nil
if let likesData = posts[indexPath.item].postLikes {
postLikes = String(likesData)
}
cell.postLikes.text = postLikes
var postDate: String? = nil
if let dateData = posts[indexPath.item].postDate {
postDate = timestampToDate(dateData)
}
cell.postDate.text = postDate
return cell
}

Answer 2

You need to check that your object has value before assigning it to the IBOutelet. You need to change your cellForRowAtIndexPath something like this
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("postCell", forIndexPath: indexPath) as! CellForPost
if let data = posts[indexPath.item].postPhoto) as? NSData {
cell.postPhoto.image = UIImage.init(data: data)
}
else {
cell.postPhoto.image = nil
}
if let postText = posts[indexPath.item].postText) as? String {
cell.postText.text = postText
}
else {
cell.postText.text = ""
}
if let postLikes = posts[indexPath.item].postLikes) as? Int {
cell.postLikes.text = String(postLikes)
}
else {
cell.postLikes.text = ""
}
if let postDate = posts[indexPath.item].postDate) as? NSDate {
cell.postDate.text = timestampToDate(postDate)
}
else {
cell.postDate.text = ""
}
return cell
}
Hope this will help you.