Late last year I mentioned an extensive library allowing you to implement many different animation effects on iOS UI elements without code.
Here’s an add-on category for UITextField called Shake from Andrea Mazzini that adds a customizable shake animation similar to that on the Mac OS X login screen.
You can easily customize how big the shake effect is, the speed of the shaking motion, and the total number of shakes.
You can find UITextField+Shake on Github here.
A nice way to provide the user with feedback when they’ve made an incorrect entry.
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