You can get rid of the warning by adding a cast. However, you should not be reading from the text of the cell, because this mixes up the levels of the Model-View-Controller: you should get the value from the model instead.
Therefore, instead of writing, say,
NSIndexPath *indexPath = [self.ReportTableView indexPathForSelectedRow];
StuardReportCustomCell *cell = (StuardReportCustomCell*)[_ReportTableView cellForRowAtIndexPath:indexPath];
NSString *text = cell.lbTime.text;
you should write
NSIndexPath *indexPath = [self.ReportTableView indexPathForSelectedRow];
NSString *text = [lbTime objectAtIndex:indexPath.row];