iphone - when select row the first selectedrow shows blank -

in viewdidload, called tableview selectrowatindexpath @ row 0, after when click other rows, row 0 shows blank. what's wrong? code:

- (void)viewdidload {     uitableview *lefttableview = [[uitableview alloc] initwithframe:cgrectmake(0, 0, 130, 300)];     lefttableview.datasource = self;     lefttableview.delegate = self;     lefttableview.tag = 0;     [lefttableview registerclass:[uitableviewcell class] forcellreuseidentifier:@"cell"];     dispatch_async(dispatch_get_main_queue(), ^{         [lefttableview selectrowatindexpath:[nsindexpath indexpathforrow:0 insection:0] animated:yes scrollposition:uitableviewscrollpositionnone];     }); }  - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {     uitableview *righttableview = (uitableview *)[self viewwithtag:1];     switch (tableview.tag) {         case 0:         {             self.right = self.left[indexpath.row][@"subchild"];             dispatch_async(dispatch_get_main_queue(), ^{                 [righttableview reloaddata];             });         }             break;     } } 

dispatch_async(dispatch_get_main_queue(), ^{     [lefttableview selectrowatindexpath:[nsindexpath indexpathforrow:0 insection:0] animated:yes scrollposition:uitableviewscrollpositionnone]; }); 

execute method after delay. may you.