IOS编程问题

Answer 1

It is recommended to use xcode7 directly, at least everyone is using it, and it is easier to answer the problems you encounter

Answer 2

I haven’t traveled through time, Xcode 4.4 is no longer useful for learning iOS, and the API has also changed a lot. When you make an iOS App, you must at least cover mainstream models

Answer 3

Why are you using such an old version...Update or...