Array index out of range iOS - ios

Question

Hi guys I have been stuck with the error 'array index out of range'. I am getting JSON data from the internet and converting it into an array. I have been loading comments (Note : I have posted this question as i couldnt find any question related to my problem)
So I have been loading comments in a jsonData. The code i've been using to load comments is this.
api.loadComments(shot.commentsUrl, completion: didLoadComments)
The code for completion is this.
func didLoadComments(comments : [Comment]){
self.comments = comments
self.tableView.reloadData()
}
It is defined in the tableView...
let cell = tableView.dequeueReusableCellWithIdentifier("Cell10", forIndexPath: indexPath) as! CommentCell
//This is where the error occurs
let comment = comments[indexPath.row]
cell.nameLabel.text = comment.user.name
cell.commentLabel.text = comment.body
cell.avatarImageView.sd_setImageWithURL(NSURL(string: comment.user.avatarUrl), placeholderImage: UIImage(named: "2"))
return cell
and the comments variable is defined like this.
var comments : [Comment] = Comment
The loadComments method is returning comments as shown in the log
The log which shows comments is not nil
The code for loadComments is this.
func loadComments(commentsUrl: String, completion: (([Comment]) -> Void)!) {
let urlString = commentsUrl + "?access_token=" + Config.ACCESS_TOKEN
let session = NSURLSession.sharedSession()
let url = NSURL(string: urlString)
let task = session.dataTaskWithURL(url!) {
(data, response, error) -> Void in
if error != nil {
print(error!.localizedDescription)
} else {
var comments = [Comment]()
do {
let commentsData = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as! NSArray
for commentData in commentsData {
let comment = Comment(data: commentData as! NSDictionary)
comments.append(comment)
}
}
catch {
}
let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0)) {
dispatch_async(dispatch_get_main_queue()) {
completion(comments)
}
}
}
task.resume()
}
The numberOfRowsInSection looks like this.
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return 9 + comments.count
}
Feel free to ask me for any more code.
Thanks in advance
Aryan

Answer 1

The reason of that problem is :
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return comments.count
}
This method return your items count. And your method
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! CommentCell
return cell
}
will run in cycle for each item in this list.
You should check items count in method "numberOfRowsInSection" and items count in "cellForRowAtIndexPath"
EDITED :
Of course you did.
return 9 + comments.count
if your comments count will be 0 your fun cellForRowAtIndexPath will call 9 times!!!
Use
comments.count
or add some checks in your code.

Answer 2

Here is how you can proceed with it.
Create a Comment class:
class Comment {
var user: User?
var commentLabel: String?
}
Create a User class:
class User {
var name: String?
var avatarUrl: UIImageView?
}
Then in your for loop parse the Json into Comment object and then add it to comments array:
for commentData in commentsData {
let commentDictionary = Comment(data: commentData as! NSDictionary)
var temp:NSArray = commentDictionary["user"] as! NSArray
var user: User?
user.name = temp["name"]
user.avatarUrl = temp["avatarUrl"]
var comment: Comment?
comment.commentLabel = commentDictionary["body"]
comments.append(comment)
}
This should be it.