Errore JSQMessageAvatarImageFactory - swift, xcode, xcode6, swift3, xcode7

Per qualche motivo sto avendo un incidente e non sono sicuro del perché. Tutto viene estratto correttamente da FIRBase. Ma quando provo a caricare l'URL dell'utente ottengo un arresto anomalo

Stampato (snapshot)

["MediaType": TEXT, "text": Test Message, "senderId": KG7b3tDTaoMwcAQAi2JI8vjj0OB2, "senderName": user1]
Optional({
email = "user1@gmail.com";
id = KG7b3tDTaoMwcAQAi2JI8vjj0OB2;
profileImage = "gs://big-pen.appspot.com/profileImage/KG7b3tDTaoMwcAQAi2JI8vjj0OB2";
username = user1;})

Errore mio

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)

Ecco il mio codice.

func observeUsers(id: String){
FIRDatabase.database().reference().child("people").child(id).observeEventType(.Value, withBlock: { snapshot in
print(snapshot.value)
if let dict = snapshot.value as? [String: AnyObject] {
let avatarUrl = dict["profileImage"] as! String

//call the setupAvatar function
self.avatar(avatarUrl, messageId: id)

}
})
}


func avatar(url: String, messageId: String){

if DataService.dataService.currentUser != nil{
if url != "" {
let fileURL = NSURL(string: url )
let data  = NSData(contentsOfURL: fileURL!)
let image = UIImage(data:data!)  //<-----I am getting an error at this line error code: "Thread1:EXC_BAD_INSTRUCTION(code=Exc_I386_INVOP, subcode=0x0)"
let userImg = JSQMessagesAvatarImageFactory.avatarImageWithImage(image, diameter: 30)
avatarDict[messageId] = userImg
}else{
JSQMessagesAvatarImageFactory.avatarImageWithImage(UIImage(named: "cam_w.png"), diameter: 30)
}
collectionView.reloadData()
}
}

override func collectionView(collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
let message = messages[indexPath.item]

return avatarDict[message.senderId]
//return JSQMessagesAvatarImageFactory.avatarImageWithImage(UIImage(named: "cam_w.png"), diameter: 30)
}

Grazie. Sono stato bloccato su questo per due giorni ormai.

risposte:

Forse non è un URL valido quindi per controllarlo cambia la tua funzione avatar in:

func avatar(url: String, messageId: String){

if DataService.dataService.currentUser != nil{
if let fileURL = NSURL(string: url ),
data  = NSData(contentsOfURL: fileURL) {

let image = UIImage(data:data!)  //<-----I am getting an error at this line error code: "Thread1:EXC_BAD_INSTRUCTION(code=Exc_I386_INVOP, subcode=0x0)"
let userImg = JSQMessagesAvatarImageFactory.avatarImageWithImage(image, diameter: 30)
avatarDict[messageId] = userImg
}else{
JSQMessagesAvatarImageFactory.avatarImageWithImage(UIImage(named: "cam_w.png"), diameter: 30)
}
collectionView.reloadData()
}
}