A Good .gitignore file for Objective-c Reference: http://nearthespeedoflight.com/article/creating_a_git_repository_for_an_existing_xcode_project

.gitignore

# Xcode 
############
.DS_Store
build/*
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3
xcuserdata
profile
*.moved-aside
DerivedData
.idea/
*.hmap
*.xccheckout

#CocoaPods
##########
Pods

# Textmate -
############
*.tm_build_errors

# Subversion
############
.svn

# Android
############
# built application files
*.apk
*.ap_

# files for the dex VM
*.dex

# Java class files
*.class

# generated files
bin/
gen/

# Local configuration file (sdk path, etc)
local.properties

# Eclipse project files
.classpath
.project

# Proguard folder generated by Eclipse
proguard/

# Intellij project files
*.iml
*.ipr
*.iws
.idea/