Is there any way to access data from iPhone inbox(SMS) to ios application to do automatic OTP verification like the one in Android? I shall be grateful for your help.
In iOS 12 Apple has introduced feature called Security Code AutoFill.
To use this in your app all you need to do is set UITextField's input view’s textContentType property oneTimeCode.
otpTextField.textContentType = .oneTimeCode
NOTE: Security Code AutoFill will only works with System Keyboard it will not work with custom keyboard.
WWDC video
When you get OTP it will look something like this: