How do I center objects in xcode for a universal application

How do I center objects in xcode for a universal application

References

Reference NO 1

http://stackoverflow.com/questions/13633651/how-do-i-center-objects-in-xcode-for-a-universal-application

Reference NO 2

http://developer.apple.com/library/ios/qa/qa1686/

Reference NO 3

http://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/AppDesignBasics/AppDesignBasics.html

Reference NO 4

http://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/AppArchitecture/AppArchitecture.html

Reference NO 5

http://codeatuts.blogspot.com/2012/10/tutorial-22-building-universal-app-in.html

Reference NO 6

http://iphonedevsdk.com/forum/iphone-sdk-development/77699-universal-apps-in-xcode-4-a-few-quick-questions.html

Reference NO 7

http://docs.xamarin.com/guides/ios/getting_started/hello,_ipad___universal_apps

Reference NO 8

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