numberOfRowsInComponent method

@override int numberOfRowsInComponent(int component)

定义每一列所显示的行数， component 代表列的索引，

Implementation

@override
int numberOfRowsInComponent(int component) {
  if (data.isEmpty) {
    return 0;
  }

  if (0 == component) {
    return data.length;
  } else if (1 == component) {
    List fl = data[firstSelectedIndex].children;
    return fl.length;
  } else {
    List<BrnMultiDataPickerEntity> secondMap =
        data[firstSelectedIndex].children;
    List thirdMap = secondMap[secondSelectedIndex].children;
    return thirdMap.length;
  }
}