How to fetch facebook's profile picture? - ios

Question

I'm trying to fetch the user's fb profile pic but wasn't able to do so far. I'm trying to do something simple: the user log in with fb account and the app goes to another view where appears his name, email and profile picture. User's name and email are okay, but I can't get the picture!
The app is crashing with my actual code because apparently I'm unwrapping a nil optional value, but I don't know why it's nil.
My code:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"id,email,name,picture.width(480).height(480)"])
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in
if ((error) != nil)
{
// Process error
print("Error: \(error)")
}
else
{
print("fetched user: \(result)")
let userName : NSString = result.valueForKey("name") as! NSString
print("User Name is: \(userName)")
let userEmail : NSString = result.valueForKey("email") as! NSString
print("User Email is: \(userEmail)")
let id = result.valueForKey("id") as! String
self.nameLabel.text = userName as String
self.emailLabel.text = userEmail as String
self.profilePic.image = self.getProfPic(id)
}
})
}
func getProfPic(fid: String) -> UIImage? {
if (fid != "") {
let imgURLString = "http://graph.facebook.com/" + fid + "/picture?type=large" //type=normal
let imgURL = NSURL(string: imgURLString)
let imageData = NSData(contentsOfURL: imgURL!)
let image = UIImage(data: imageData!) // CODE CRASHES IN HERE
return image
}
return nil
}

Answer 1

From your comments I understand that it crashes at the image assigning, you should be doing it with the conditional binding methodology of Swift (if let) in order to avoid unwrapping a nil optional value:
if let data = result["picture"]?["data"]
{
if let url = data["url"] as? String
{
profilePictureURL = url
}
}
Also, as you can see I am not using the valueForKey method.