How to refer each UIButton

I add 10 buttons to UIScrollView

for开发者_Python百科 (int i=0; i<10; i++) {

     UIButton *btn =  ....  

     [ScrollView addSubview:btn];

}

How can i refer to each button ?

btn.tag = i;

and later,

[scrollView viewWithTag: 2];

Either set the tag on each view, and find them using viewWithTag, or save references to each in an NSMutableArray or other data structure.