flutter 手动触发RefreshIndicator刷新

GlobalKey<RefreshIndicatorState> _indicatorKey =
      GlobalKey<RefreshIndicatorState>();

body: RefreshIndicator(
        key: _indicatorKey,
        onRefresh: () async {
          try {
            await _viewModel.loadNewData();
          } catch (e) {
            showErrorHint(context, e);
            throw (e);
          }
},

_refresh() {
    _indicatorKey.currentState.show();
}