//某个section刷新    
NSIndexSet *indexSet = [[NSIndexSet alloc] initWithIndex:2];   
[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];   

//某个cell刷新    
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:1 inSection:0];    
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone]; 
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