objective c - iOS UISegmentedControl cannot positon programatically -

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I can not change the location of UISegmentedControl if I do this: 

  segControl2.frame = CGRectMake (segControl1.origin.x, segControl2.origin.y, segControl2.size.width, segControl2.size.height);   
 Nothing really changes, and everyone says that the frame of control should change, but it is not really.  
 
   cgtff frame = [[USScreen main screen] border]; UISegmentedControl * segControl = [[UISegmentedControl] initWithItems: [NSArray alloc] initWithObjects: @ "one", @ "two", @ "three", zero]; SegControl.frame = CGRectMake (frame.organ.50, frame.corein + 50, segControl.size.width, segControl.size.height); [Adviewview: see cajccontrol];   
 should work fine now.

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