Create singleton using GCD's dispatch_once in Objective-C

Question

If you can target iOS 4.0 or above

Using GCD, is it the best way to create singleton in Objective-C (thread safe)?

+ (instancetype)sharedInstance
{
          


        

Answer 1

Dave is correct, that is perfectly fine. You may want to check out Apple's docs on creating a singleton for tips on implementing some of the other methods to ensure that only one can ever be created if classes choose NOT to use the sharedFoo method.