ios - UISegmented Control ObjectAtIndex replacement for swift -

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After switching to the swift, I can not find object on the object to control the segment

this How do i 

  [[fractured control subviews] objectAtIndex: 0]

What is the equivalent in the swift for the above line?

UISegmentedControl UIView is a line from SubView array, so 

  Segment control. SUV View [0]

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