For what platform should i compile my application so it can be available to others? 32bit or 64bit?

I'm ne开发者_Go百科w to OS X world but i want to learn how to, and then build a Mac OS X application using Objective C and XCode.

What i don't know is for what platform should i compile this app so i can make it available to others. Do i compile it for 32bit or most of the Macs are 64bit now and i'm ok by compiling it for 64bit?

Modern Macs are all 64-bit now, but you can still compile your apps for 32-bit/64-bit so they will work on both platforms.

If you are learning and have no need for backwards compatibility I would stick to 64-bit. That way you get to use all the advantages of the modern runtime (only available on 64-bit), and ARC(only available on 64-bit).