firstItem property

Implementation

objc.ObjCObjectBase? get firstItem {
  objc.checkOsVersionInternal('NSLayoutConstraint.firstItem', iOS: (false, (6, 0, 0)), macOS: (false, (10, 7, 0)));
  final _ret = _objc_msgSend_151sglz(this.ref.pointer, _sel_firstItem);
  return _ret.address == 0 ? null : objc.ObjCObjectBase(_ret, retain: true, release: true);
}