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cocoa - How to add these object with name to the array by this order?

I have some object with name , just like button 1 , button 2 , button 11 ,button 111 , I want to add this object to a array by this order: button 1 ,button 2 , button 11 , button 111 ,but I found that these object can add the array by this order: button 1 , button 11,button 111 , button 2.why ? Thank you for your answer!

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