UITextField Validation visual feedback

Question

i have a uiTextField that i am validating input on, when i have invalid input what are some appropriate ways to show that the input is invalid? is there any built in mechanism for showing invalid input states?

Answer 1

Have a look at Managing Overlay Views section in UITextField docs

Answer 2

Put a check mark to the right of the UITextField when correct, Else put an X to the right of it. to make it look smooth: fade it using an animation