The Per Rewrite Diaries: Day 46

This post is part of a series about rewriting my iOS app, Per. Per is a price per unit comparison app with a bunch of neat convenience figures, but it hasn’t been updated in years, so I’m rewriting it from scratch to eliminate a bunch of technical debt. Just because it’s not an open-source app doesn’t mean I can’t share what I learn as I go!

See the rest of the series here.

Two Steps Forward, One Step Back

Papercuts are the little scratches you get as you plow headlong through the prickly underbrush of implementing features.

One such papercut that I sorted out this morning was a weird UIToolbar iOS 13 bug requiring me to set a size on the input accessory view’s frame lest I get that annoying “unable simultaneously satisfy constraints” warning. Previously, you could instantiate the toolbar with a simple

let inputAccessoryView = UIToolbar()

but now you’ll need to do something like:

let inputAccessoryView = UIToolbar(frame: CGRect(x: 0, y: 0, width: 100, height: 100)).

I’m running into a weird bug, however, where the input view changes size on some devices between my custom calculator keyboard and the picker view:

“Screenshots from an iPhone 8 and iPhone 11 showing relative differences in input view height”

Notice how those input views are the same size on an iPhone 8 (on the left), for example, but very different on an iPhone 11 (on the right).

I’ll dig into this some more tomorrow.

Angelo Stavrow

Montreal, Canada
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Mobile/full-stack developer. Montrealer. Internet gadabout. Your biggest fan.