How to quickly learn the basics of objective-c?

Question

Objective-C

Good afternoon.
A little vacation, there is time to learn something new. I decided to look towards development for iOS. Programming knowledge mainly in PHP and JS, i.e. that you do not need to compile and monitor memory + know all sorts of subtleties. I started reading, watching videos, and everywhere they show how good xCode is. There is very little practice in the code itself, writing classes, objects, subtleties. Basically they say what will happen, and not why it should be written that way. There are many places where they write for C developers. This is very infuriating) when the first lessons and immediately say another language as an example: "but how it will be in obj C" - well, what is it?) Can you advise where to start? Or literature where there are no references to other languages, but everything is simply written. Or should I start with C? C++?
Another would be advice on what to write after "hello world". Let's say with php it's a guest book, with JS it's working with jquery, css, html forms. But on iOS, what is a simple application?
thanks in advance.

Answer 1

1) Stanford Courses on iTunes. Theory + Practice.
2) Courses by Alexey Skutarenko VK + youTube. Theory + Practice.
3) Apple documentation. Application Development Examples.
on iOS, traditionally hello World-2 is to file a clone of something, or an application that, for example, displays a list of the most liked photos of your friends from instagram.

Answer 2

Objective-C is built on top of C.
Any C code will be valid Objective-C code.
Therefore, if there is no knowledge of C, then you need to get it.
You don't need to know C++ (and besides, it is orders of magnitude more complicated than these two languages ​​together).
I taught courses from Lynda, one full day was enough for me for the entire course. Only the memory management was unusual, and I had to additionally ask my friends how it works.

But on iOS, what is a simple application?

Graphing Calculator for iPhone

Answer 3

Maybe Swift is better? Behind him is the future on IOS/OSX.