Swift 3 upload image to Parse Server - ios

Question

I'm trying to upload an image to Parse Server usinf PFFile. I'm not having issues uploading it manually from Parse Dashboard and retrieving it from the app. But if I try to upload a new one with this method, the image is not being updated.
The rest of fields are beeing uploaded correctly (name, lastname, username and email)
Save method:
#IBAction func saveBtnPressed(_ sender: Any) {
print("Start saving...")
let imageData = UIImagePNGRepresentation(profilePic.image!)
print ("imageData value:")
print(imageData!)
let imageFile = PFFile(name:"avatar.png", data:imageData!)
print ("imageFile value:")
print(imageFile!)
let query = PFQuery(className: "_User")
query.whereKey("username", equalTo: (PFUser.current()?.username)!)
query.findObjectsInBackground(block: { (objects, error) in
if let user = objects {
for object in user {
object["name"] = self.nameFld.text
object["lastname"] = self.lastnameFld.text
object["username"] = self.emailFld.text
object["email"] = self.emailFld.text
object["avatar"] = imageFile
print(object)
object.saveInBackground()
}
}
})
}
Output:
Start saving...
imageData value:
8358983 bytes
(lldb)

Answer 1

To make this work you will need to upload picture only first and then reference it to the user
let imageData = UIImagePNGRepresentation(profilePic.image!)
print ("imageData value:")
print(imageData!)
let imageFile = PFFile(name:"avatar.png", data:imageData!)
print ("imageFile value:")
print(imageFile!)
imageFile.saveInBackground { (result, error) in
if let error = error{
print(error)
}else{
let query = PFQuery(className: "_User")
query.whereKey("username", equalTo (PFUser.current()?.username)!)
query.findObjectsInBackground(block: { (objects, error) in
if let user = objects {
for object in user {
object["name"] = self.nameFld.text
object["lastname"] = self.lastnameFld.text
object["username"] = self.emailFld.text
object["email"] = self.emailFld.text
object["avatar"] = imageFile
print(object)
object.saveInBackground()
}
}
})
}
}
}
Be aware that in the above example the file is always uploaded to the server even if no users match the query so consider uploading file only after getting query results.

Answer 2

There is no need to query current user. You can do it as follows:
#IBAction func saveBtnPressed(_ sender: AnyObject) {
let userToUpdate = PFUser.current()!
userToUpdate["name"] = self.nameFld.text
userToUpdate["email"] = self.emailFld.text
userToUpdate["username"] = self.emailFld.text
// Save Avatar
if profilePic.image != nil {
let imageData = UIImageJPEGRepresentation(profilePic.image!, 0.5)
let imageFile = PFFile(name:"avatar.jpg", data:imageData!)
userToUpdate["avatar"] = imageFile
}
// Saving block
userToUpdate.saveInBackground(block: { (succ, error) in
if error == nil {
print("Your Profile has been updated!")
} else {
print("Failed")
}})
}