StackOverflow2013

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POUsing UIButton to refresh the UItableViewCell content
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copied!<p>There are two components, UItableView and a UIButton, in my app.</p> <p>The UItableViewcell will load the data from remote database fulfilled by JSON.</p> <pre><code>-(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; } </code></pre> <p>However, I want to refresh all the table content when user press the button, and I try to implement the following code:</p> <pre><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"]; } } </code></pre>

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