Loading no time but when the answering server about tksubmittransition

[sarfrazb]

It's likely the above poster has either already solved this problem, or has given up, but I too had this same requirement and struggled a little bit. I figured I'd post my logic in case it helps any newbies like myself in future :)

You can call button.startLoadingAnimation() right before you make your request.
Once you receive the response from the server, you can then call
button.startFinishingAnimation(1) { // your completion code goes here }

One thing I had to be careful of was that if your query is happening on a background thread, you'll have to jump to the main thread to call the finishing animation.

So, as an example, my logIn function might look like:

// start loading the button animations
button.startLoadingAnimation()
// run query in background thread
async.background {
        let query = PFQuery(className: "Blah")
        query.whereKey("user", equalTo: user)
	let results = try! query.findObjects()
	if results.count == 0 {
		// insert alertView telling user that their details don't work
	}
	else {
		// return to main thread to complete login
		async.main {
                        // tell the button to finish its animations
			button.startFinishingAnimation(1) {
			        let sb = UIStoryboard(name: "Main", bundle: nil)
	            	        let vc = sb.instantiateViewController(withIdentifier: "MainVC")
			        vc.transitioningDelegate = self
			        self.present(vc, animated: true, completion: nil)
                        }
		}
	}