message: Initialised selected segment index
diff: #import "NVSegmentedControlView.h"
  @implementation NVSegmentedControlView
  +{
  + NSInteger _selectedIndex;
  +}
  - (void)setTitles:(NSArray<NSString *> *)titles
  {
  +
  [self removeAllSegments];
  for (NSString *title in titles) {
  [self insertSegmentWithTitle:title atIndex:self.numberOfSegments animated:NO];
  }
  + self.selectedSegmentIndex = _selectedIndex;
  }
  @end
  