Is it possible to have environment like Xcode or Visual Studio on the tablets like Ipad for example?

Question

I have seen only online compilers

Answer 1

Possible ? Yes.
But are there any? Not really. I mean today's tablets do have enough computing power to run IDEs, but it's not really productive friendly. Complex IDEs require complex controls which are not really possible on Tablets. They are not simply designed to be workstations.
Those online compilers are for quick testing and simply made just for fun. No real developer really uses online compiler. I've not seen any thus far.
Also, Microsoft tablets don't really count as pure tablets, they are more like Hybrid. Anyway, they are slow for developing complex projects anyway.