decompile an app binary to get back to source code

Is there anyway to take a binar开发者_运维知识库y - even signed by yourself, and get back to the code? I'm trying to recover something that I deleted a while ago... but have the binary here.

Any ideas?

You can disassemble a binary and get back assembly source, but there is no way to get back your original Objective-C structured source code.

EDIT: You may want to give Hopper a try. I didn't try it personally yet but Mike Ash says it's good.

You might want to have a look at Hex-Rays decompiler. You need to have IDA Pro debugger to use it.