自定义self.navigationItem.titleView ，
1、必须在懒加载里设置固定的frame，不然iOS10以下，会出现抖动
2、必须设置
if (@available(iOS 11.0, )){
_titleView.translatesAutoresizingMaskIntoConstraints = NO;
_titleView.intrinsicContentSize = CGSizeMake(200SCALE_X, 45);
}
否则在iOS11以上出现自定义的点击事件不响应

• (void)setupNav{

  [self.titleView addSubview:self.titleL];
  [self.titleView addSubview:self.titleIV];
  self.title = @"";
  self.navigationItem.titleView = self.titleView;

  [self.titleL mas_makeConstraints:^(MASConstraintMaker *make) {
  make.centerX.equalTo(self.titleView.mas_centerX).offset(-6);
  make.centerY.equalTo(self.titleView.mas_centerY);
  }];
  [self.titleIV mas_makeConstraints:^(MASConstraintMaker *make) {
  make.left.equalTo(self.titleL.mas_right).offset(3);
  make.centerY.equalTo(self.titleView.mas_centerY);
  make.width.height.equalTo(@12);
  }];

  @weakify(self);
  [self.titleView bk_whenTapped:^{
  @strongify(self);
  [self chooseSeatMode];
  }];
  }

• (CCDSeatNavCustiomView )titleView{
  if (!_titleView) {
  _titleView = [[CCDSeatNavCustiomView alloc] initWithFrame:CGRectMake(120, 20, 180SCALE_X, 45)];
  _titleView.backgroundColor = [UIColor clearColor];
  _titleView.userInteractionEnabled = YES;
  if (@available(iOS 11.0, )){
  _titleView.translatesAutoresizingMaskIntoConstraints = NO;
  _titleView.intrinsicContentSize = CGSizeMake(200SCALE_X, 45);
  }
  }
  return _titleView;
  }

• (UILabel )titleL{
  if (!_titleL) {
  _titleL = [[UILabel alloc] initWithFrame:CGRectMake(120, 20, 150SCALE_X, 45)];
  _titleL.textColor = [UIColor whiteColor];
  _titleL.text = CCDLocalizedString(@"addWatchedSeats", @"我关注的桌位");
  _titleL.textAlignment = 1;
  _titleL.userInteractionEnabled = YES;
  }
  return _titleL;
  }

• (UIImageView *)titleIV{
  if (!_titleIV) {
  _titleIV = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.titleL.frame)+3, 20, 12, 12)];
  _titleIV.image = CCDImageFromCurrentBundle(@"select_seat_arr");
  _titleIV.userInteractionEnabled = YES;
  }
  return _titleIV;
  }