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iOS

Create IBOuletCollection for multiple buttons and change tint color. (Objective-C)

So I have multiple buttons, and I want to change the tint color of all of them upon running of the app, but I don't want to create individual properties for all 11 of them. I tried creating an IBOuletCollection for all of them, but my app crashes because it says that UIButton is not supported for IBOuletCollection classes. I was wondering if there is a way I can do that without creating 11 unnecessary properties for each button. Thanks.