iPhoneアプリ開発で役立つ .gitignore の設定と題しまして、Stack Overflow からの盛大なるコピペです。

・Git ignore file for Xcode projects - Stack Overflow

# Mac OS X
.DS_Store

# Xcode
*.pbxuser
*.mode1v3
*.mode2v3
*.perspectivev3
*.xcuserstate
project.xcworkspace/
xcuserdata/

# Generated files
*.o
*.pyc

# Python modules
MANIFEST
dist/
build/

# Backup files
*.swp
*~.nib

# CocoaPods
Pods/*

これで勝つる！