fatal Error Unexpectedly while unwrapping an optional value while loading Comments - ios

Question

Hi guys i have been stuck in this problem for nearly 2 week
The Problem is that i am getting the error fatal Error Unexpectedly while unwrapping an optional value while i am loading comments..
I am trying to load JSON data For the Comments
in PopularShotsCollectionViewController
import UIKit
import FMMosaicLayout
private let reuseIdentifier = "Cell"
class PopularShotsCollectionViewController: UICollectionViewController {
private var shots : [Shot] = [Shot](){
didSet{
self.collectionView?.reloadData()
}
}
var API_URL = Config.SHOT_URL
var shotPages = 1
var shot : Shot!
var comments : [Comment] = [Comment]()
var tableView : UITableView!
override func viewDidLoad() {
super.viewDidLoad()
let layout : FMMosaicLayout = FMMosaicLayout()
self.collectionView?.collectionViewLayout = layout
// Do any additional setup after loading the view.
self.title = "Popular"
self.API_URL = Config.POPULAR_URL
self.loadShots()
self.loadComments()
}
func loadComments(){
// When i debug shot.commentsUrl does not return nil
DribbleObjectHandler.getComments(shot.commentsUrl) { (comments) -> Void in
self.comments = comments
}
}
But i am getting this error:
The code for the getCommentsMethod
class func getComments(commentsUrl : String, completion:(([Comment]) -> Void)) {
var comments = [Comment]()
let url = commentsUrl + "&access_token=" + Config.ACCESS_TOKEN
HttpService.getJSON(url) { (jsonData) -> Void in
for commentData in jsonData {
let comment = Comment(data: commentData as! NSDictionary)
comments.append(comment)
}
let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0), { () -> Void in
dispatch_async(dispatch_get_main_queue(), { () -> Void in
completion(comments)
})
})
}
}
Code for the HttpService
import Foundation
import UIKit
import Alamofire
class HttpService {
class func getJSON(url: String, callback:((NSArray) -> Void)) {
let nsURL = NSURL(string: url)!
Alamofire.request(.GET, nsURL).response { (request, response, data, error) -> Void in
if error != nil{
print("error")
}
if data != nil {
let jsonData = (try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)) as! NSArray
print(jsonData)
callback(jsonData)
}
}
}
}
If you need more Code to solve the problem i am more than happy
And in PopularShotsCollectionViewController i have been loading shots also
with the same method
func loadShots(){
DribbleObjectHandler.getShots(API_URL) { (shots) -> Void in
self.shots = shots
}
}
but i get no error and it works perfectly
and code for the get Shots is same.. Just we access The Shot class in loadShots and we access The Comment Class in loadComments
The Comment Class
import Foundation
import UIKit
class Comment {
var id : Int!
var body : String!
var date : String!
var user : User!
init(data : NSDictionary){
self.id = data["id"] as! Int
let bodyHTML = Utils.getStringFromJSON(data, key: "body")
self.body = Utils.stripHTML(bodyHTML)
let dateInfo = Utils.getStringFromJSON(data, key: "created_at")
self.date = Utils.formatDate(dateInfo)
if let userData = data["user"] as? NSDictionary {
self.user = User(data: userData)
}
}
}
Code for the Shot Class
import Foundation
class Shot: DribbbleBase {
var imageUrl : String!
var htmlUrl : String!
var commentsUrl : String!
var bucketsUrl : String!
var likesUrl : String!
var attachmentUrl : String!
var reboundUrl : String!
var title : String!
var date : String!
var description : String!
var commentCount : Int!
var viewsCount : Int!
var likesCount : Int!
var bucketsCount : Int!
var attachmentsCount : Int!
var reboundCount : Int!
var user : User!
override init(data: NSDictionary) {
super.init(data: data)
self.commentCount = data["comments_count"] as! Int
self.likesCount = data["likes_count"] as! Int
self.viewsCount = data["views_count"] as! Int
self.bucketsCount = data["buckets_count"] as! Int
self.attachmentsCount = data["attachments_count"] as! Int
self.reboundCount = data["rebounds_count"] as! Int
self.commentsUrl = Utils.getStringFromJSON(data, key: "comments_url")
self.bucketsUrl = Utils.getStringFromJSON(data, key: "buckets_url")
self.likesUrl = Utils.getStringFromJSON(data, key: "likes_url")
self.title = Utils.getStringFromJSON(data, key: "title")
self.attachmentUrl = Utils.getStringFromJSON(data, key: "attachments_url")
self.reboundUrl = Utils.getStringFromJSON(data, key: "rebounds_url")
let dateInfo = Utils.getStringFromJSON(data, key: "created_at")
self.date = Utils.formatDate(dateInfo)
let desc = Utils.getStringFromJSON(data, key: "description")
self.description = Utils.stripHTML(desc)
let images = data["images"] as! NSDictionary
self.imageUrl = Utils.getStringFromJSON(images, key: "normal")
//let tags = data["tags"] as! NSArray
if let userData = data["user"] as? NSDictionary {
self.user = User(data: userData)
}
}
}
and Code for DribbbleBase
import Foundation
class DribbbleBase {
var id: Int
init(data: NSDictionary){
self.id = data["id"] as! Int
}
}
Please help me.. And Please Bear in mind i am fairly new to Swift
Thanks in Advance
Aryan

Answer 1

you declared shot property in your PopularShotsCollectionViewController and you didn't initialize it so shot is be nil. Then you tried to access commentsUrl property of shot which is nil in the loadComments method. You should instantiate shot in the init or view did load method of your view controller