What Apple says about Singleton:
Cocoa Core Competencies.Singleton
Creating a Singleton Instance
What other people say:
Singletons in Cocoa/Objective-C
Implementing a Singleton in iOS
Implementing a Singleton in Objective-C / iOS
Singleton Classes
A note on Objective-C singletons
Singletons, AppDelegates and top-level data.
A long discussion about it in Stackoverflow: What does your Objective-C singleton look like?
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