Using UIButton to refresh the UItableViewCell content - objective-c

Question

There are two components, UItableView and a UIButton, in my app.
The UItableViewcell will load the data from remote database fulfilled by JSON.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *TableIdentifier = #"tableidentifier"
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:TableIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:TableIdentifier] autorelease];
}
NSDictionary *voc_list=[listData objectAtIndex:indexPath.row];
NSLog(#"%#",voc_list);
cell.textLabel.text = [[(NSDictionary*)voc_list objectForKey:#"vocabulary_list"]objectForKey:#"Vocabulary"];
cell.detailTextLabel.text=[[(NSDictionary*)voc_list objectForKey:#"vocabulary_list"]objectForKey:#"Translation"];
cell.textLabel.font = [UIFont boldSystemFontOfSize:15];
return cell; }
However, I want to refresh all the table content when user press the button, and I try to implement the following code:
-(IBAction)historyPressed:(id)sender{
isToogle = !isToogle;
if(isToogle){
// Back to original table content
}else{
// Following codes will communicate with remote server and filter data to the app.
// The app go smooth here.
NSError *error = NULL;
NSDictionary *getStuID=[NSDictionary dictionaryWithObjectsAndKeys:student_id,#"Stu_ID", nil];
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:getStuID options:NSJSONWritingPrettyPrinted error:&error];
[self sendTOcompareByJSON:jsonData];
//Following codes are trying to show/refresh the data on tableview, but the app will go crash.
CGPoint location = [sender locationInView:self.table];
NSIndexPath *indexPath = [self.table indexPathForRowAtPoint:location];
UITableViewCell *new_cell=[self.table cellForRowAtIndexPath:indexPath];
historyList_= [NSArray arrayWithArray:personalized_history];
NSDictionary *dic = [historyList_ objectAtIndex:indexPath.row];
new_cell.textLabel.text=[[(NSDictionary*)dic objectForKey:#"history_list"]objectForKey:#"Vocabulary"];
new_cell.detailTextLabel.text=[[(NSDictionary*)dic objectForKey:#"history_lsit"]objectForKey:#"Score"];
}
}

Answer 1

In the historypressed method just try to call [yourtableview reloaddata].. After your setting of all the cell content do reloaddata,it will refresh the tableview.

Answer 2

I dont know how you getting data from [self sendTOcompareByJSON:jsonData];. If its a sync call, to webserver, then you can just update your datasource (in ur case you are filling tableview using listData) just after this.So once the listData is updated with the new contents, then you should reload your tableview like this [self.table reloadData]
If its an async call to web server, then do update the datasource and reload the table on callback.
Hope this helps.