Proper way to Encode and Send String as a PFObject - ios

Question

I'm having an issue sending a string to Parse. Here's the line where the code stops:
Here's what my code looks like:
var friends: Array<AnyObject>?
var recipients: NSMutableArray?
var message: String!
var sendMessage:String!
override func viewDidLoad() {
super.viewDidLoad()
sendMessage = message
friends = []
recipients = []
let editButton = UIBarButtonItem(title: "Edit", style: UIBarButtonItemStyle.Plain, target: self, action: "edit")
navigationItem.rightBarButtonItem = editButton
tableView = UITableView(frame: view.bounds, style: UITableViewStyle.Plain)
tableView?.delegate = self
tableView?.dataSource = self
view.addSubview(tableView!)
let sendButton = [UIBarButtonItem(title: "Send", style: .Done, target: self, action: "sendPressed")]
toolbar.frame = CGRectMake(0, self.view.frame.size.height - 46, self.view.frame.size.width, 48)
toolbar.sizeToFit()
toolbar.setItems(sendButton, animated: true)
self.view.addSubview(toolbar)
}
func sendPressed () {
sendMessagetoParse()
}
func sendMessagetoParse(){
let messageString = message
let data = messageString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)! as NSData
// NSConcreteMutableData
let file = PFFile(name:message, data:data)
file.saveInBackground()
let sentMessage = PFObject(className:"Messages")
sentMessage["messages"] = file
sentMessage["username"] = PFUser.currentUser()?.username
sentMessage.setObject(self.recipients!, forKey: "recipientIds")
sentMessage.setObject(PFUser.currentUser()!.objectId!, forKey: "senderId")
sentMessage.setObject(PFUser.currentUser()!.username!, forKey: "senderName")
sentMessage.saveInBackgroundWithBlock { (success: Bool, error: NSError?) -> Void in
if (success) {
println("Message sent!")
I want to send the string object to my parse account. I've also used the method Parse provides,, i.e. dataUsingEncoding(NSUTF8StringEncoding) but that is also returning the same error. Any clue on the proper format or how I need to fix the code?
EDIT:
Okay, I'm no longer getting the error, but my only issue is that once I press 'send', it doesn't do anything. Here's my edited code:
func sendMessagetoParse(){
let messageString = message
if messageString != nil
{
let data = messageString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)! as NSData
// NSConcreteMutableData
let file = PFFile(name:message, data:data)
file.saveInBackground()
let sentMessage = PFObject(className:"Messages")
sentMessage["messages"] = file
sentMessage["username"] = PFUser.currentUser()?.username
sentMessage.setObject(self.recipients!, forKey: "recipientIds")
sentMessage.setObject(PFUser.currentUser()!.objectId!, forKey: "senderId")
sentMessage.setObject(PFUser.currentUser()!.username!, forKey: "senderName")
sentMessage.saveInBackgroundWithBlock { (success: Bool, error: NSError?) -> Void in
if (success) {
println("Message sent!")
var alert = UIAlertController(title: "Awesome!", message: "Message was Sent", preferredStyle: UIAlertControllerStyle.Alert);
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: nil));
//show it
self.navigationController?.popToRootViewControllerAnimated(true)
} else {
println("error")
}
}
}
}
Here's code from the previous view controller, called ConfirmViewController, in which I tried to use a segue to pass a text label into the messageString into the current view controller, which is called FriendsViewController:
override func prepareForSegue(segue: (UIStoryboardSegue!), sender:
AnyObject!) {
if (segue.identifier == "addFriends") {
var mvc = segue!.destinationViewController as!
FriendsViewController;
mvc.sendMessage = messageView.text
}
}
With the segue set up in the ConfirmViewController I then set sendMessage equal to message in the viewDidLoad, as shown in my first edit.

Answer 1

Check your
let messageString
value. This runtime error you've got is probably a result of implicitly unwrapping optional value that is nil. You would want to execute your code inside an if statement like:
if let messageString != nil
{
////put your saving code here
}

Answer 2

Try this:
override func viewDidLoad() {
super.viewDidLoad()
// sendMessage = message
message = sendMessage