I make an app that provides a convenient way to check your PRESTO card balance. I started working on this as a side project over a year ago and released it early this year. There is no API available so I had to resort to scraping the data. And of course it would change at the least convenient time.
I planned to make my app free as a promotion during 🇨🇦 Thanksgiving - an impromptu decision probably influenced by a podcast I was listening earlier. The next day I began to do some simple marketing. Thankfully a colleague notified me that the PRESTO website was down before I caused too much damage.
Since the upgrade was going to take place from Friday - Monday, it would mean that my app would stop working for 4 days! It was after the holiday that I discovered that the existing app would not function due to the website changes. At this point I wished I had built some facility for my app to dynamically show a message to users.
Worse, I was in the middle of another project and could not immediately jump on to update the app. This led to some bad reviews which I expected. Most apps either have no reviews, or terrible ones when things go south. It takes a lot for a user to spend time leaving a positive note, but that’s something I’m still aiming for.
The most difficult challenge I faced was really a giant snowball. I had actually migrated to Swift 3 about a week after GM but I put it on hold due to some issues with ATS (before the website was upgraded). Another gotcha was that Swift 3 changed the way that implicitly unwrapped optionals work when converting to strings. But the real problem was testing the migration. I wanted to be real safe that the upgrade would work but I couldn’t download the App Store build because I had taken it down. I also couldn’t make a dev build of the production version because it was Swift 2.2 code, which cannot be loaded on my iOS 10 device.
In the end I did a few tests and opted to just ship it because the production version wasn’t working anyway. Luckily everything went well!
A major point of failure is depending on other services but it’s the reality of current apps. Well, at least the new website supports forward secrecy.