I am an Android developer.
I tried once to develop with iOS and I found myself​in a very different environment and logic.
could you suggest a book or videos to learn iOS fastly for Android developers?

I am the opposite. I came from iOS trying to learn Java for android. The best and fastest way for me was to duplicate one of my iOS projects in android.

Good luck

Learn something crossplatform! I use cocos2D-x 🖒🖒🖒

there a few good online courses. search for the MIT one. the main problem is the swift vs Java language problem. swift is much more abstract, making moving from Java either a "thank god, I don't need so much boiler plate" or "how do I spawn a thread to do something?"

I am not an expert, I am just a student but If you know some c# I would recommend trying xamarin for all three platforms, It has been very helpful to me.

@NachoDevs I used Xamarin for like one year (and still sometimes), you need to have little skills on the native features in Android/iOS/Windows to develop a really good application.
Also, Xamarin.Forms is not that stable ! so you have to implement UI for each platform and share the logic between them all.

@lazyDev yeah, you are right, you need some basics about all platforms at the end of the day but still very easy to use. Thanks for the advice!