Question

What should someone know or do before they upgrade from XCode 3 to 4? What did you wish someone had told you before you started the install? For example…

Are Xcode 3 snapshots incompatible with Xcode 4?

Will I be able to run older applications on the new version of xcode

Links are as welcome as original advice, but please don’t just search and paste, check it’s specifically useful for someone to know before they do the new install.

Please note: I’m not asking for XCode 4 installation instructions, or for guides on using XCode 4 when you know XCode 3.

Thanks,

Answer 1

You can install Xcode 4 alongside an existing Xcode 3 installation, so you don’t really risk anything by installing it.

The thing that kept me using Xcode 3 for quite a while after installing Xcode 4 was that the new integrated Interface Builder can’t handle plugins, which are quite common in Mac development (not relevant for iOS stuff though).

The project format is compatible, so you can open any Xcode 3 project in 4 and vice-versa. Xcode 4 adds some additional files, but Xcode 3 just ignores them.