如何与iOS中的多个视图控制器共享一个数组

I value the opinions on this site and wanted to know what you all thought. I have an app that contains an array. This array is used in several view controllers. Currently, I create the array each time one of the view controllers opens up. I don't believe this to be the best thing to do. I have used NSUserDefaults before, and singletons, but am open to any ideas you have, plist, etc. I am looking on making things run quick and efficient. I value the opinions on this site and wanted to