There seems to be a podspec for GeoFire: at https://github.com/firebase/geofire-objc/blob/master/GeoFire.podspec, but CocoaPods has no idea it exists http://cocoapods.org/?q=geofire. Is there a way to install GeoFire with CocoaPods?
It looks like GeoFire has created a podspec, but hasn't published it on CocoaPods. This should work though:
platform :ios, '7.0'
pod 'GeoFire', :git => 'https://github.com/firebase/geofire-objc.git', :tag => 'v1.1.0'
Disclaimer: I have never used GeoFire or don't even know what it does. The solution is provided solely based on the information in the question.