There was a big furore in October when the community discovered that the redesigned Calculator app in iOS 11.0 had a semi-serious bug; people noticed that if you typed 1 + 2 + 3 quickly, it would give the incorrect answer. The real problem here was that the fade animation on the operand buttons (+, – etc) would block user interaction until it completed. This meant that if you typed quickly, the second press of the + button when typing 1 + 2 +3 would be ignored, but really this happened with any combination of inputs that pressed the operands quickly.
In iOS 11.2, Apple ‘fixed’ this issue. They removed the animation altogether making state changes instantaneous. It quelled complaints but obviously was not what was originally designed. In iOS 11.3, Apple will rollout the true fix – the animations are back, and do not block user interaction. Video below …
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