Earlier quoted context omitted.
What professional applications require ios?
I had an insurance adjuster at my house to evaluate hail damage earlier this year and he did everything on an iPad. My doctor uses an iPad for Medscape (? not sure if that's right) and some other mobile point of care app. My mother in law is a real estate agent and her office uses iPads for everything. There's a ton of them and it's a very hot area right now. It's a great time to be an iOS developer.
iOS development is becoming 'just another' language in your stack.