Get all instances of a class in objective c?

Question

I have a UIView that has many instances and each one of them has a UIRecognizer.

When on of them is tapped I want to remove all the recognizers of the others.

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Answer 1

I have two ideas:

1/ Create a class array with all the instances static NSArray* instances;, register them when initializing, unregister when deallocating. The array should have only weak references, otherwise they will never be deallocated.

2/ NSNotification. All instances can wait for a notification and if you tap, you send the notification.