Unable to update imagefile column in Parse using Swift - swift

Question

I am selecting a cell in table view, passing value to view controller and then allow user to update the row on Parse (running on Heroku) using below code.
Issue i am facing is - "title" column is updated but imagefile column doesnt get updated with new image selected. I can see that new image is indeed passed into the code.
I am using synchronous call because dont want user to move ahead unless record is saved.
what could be wrong? Same code to save a new object works fine.
Thanks
Ashish
let query = PFQuery(className:"class")
query.whereKey("objectId", containsString: passedObject.objectId)
do {
let results = try query.findObjects()
if results.count == 0 {
print("error")
success = false
} else {
//update
do {
let obj = results.first
obj!["title"] = Title.text!
let imageData = UIImageJPEGRepresentation(imageOutlet.image!,0.2)
let imageFile = PFFile(name: "image.png", data: imageData!)
//try imageFile?.save() // is this needed?
obj!["imagefile"] = imageFile
try obj!.save()
self.success = true
} catch let er as NSError {
print(" error while updating - \(er)")
}
}
} catch {
print("error while querying \(error)")
success = false
}

Answer 1

I ran some tests on my side and this code works for me:
Aync Version
let query = PFQuery(className: "FileTest")
query.findObjectsInBackgroundWithBlock {
(objects: [PFObject]?, error: NSError?) -> Void in
let imageData = UIImageJPEGRepresentation(self.imageOutlet.image!, 0.2)
let fileToSave = PFFile(name: "myfile.png", data: imageData!)
let firstObj = objects?.first
firstObj!["fileToSave"] = fileToSave
firstObj!.saveInBackgroundWithBlock { (success: Bool, error: NSError?) -> Void in
print("Object has been saved.")
}
}
Sync Version
let query = PFQuery(className: "FileTest")
do {
let objects = try query.findObjects()
let firstObj = objects.first
let imageData = UIImageJPEGRepresentation(self.imageOutlet.image!, 0.2)
let fileToSave = PFFile(name: "myfile.png", data: imageData!)
firstObj!["fileToSave2"] = fileToSave
try firstObj!.save()
print("object saved")
} catch let er as NSError {
print("error")
}