ios - 如何使用 NSNotificationCenter 发送数据并在收到数据后重新加载 UITable？

Question

我有一个NSNotificationinviewController1发送调用方法object:selectedTableString 时的didSelectRowAtIndexPath:in viewController1。

object:selectedTableString然后在 中拾取该对象viewController2。控制台输出正确，物体被正确拾取。我面临的问题是如何在[mainTable reloadData];收到通知时重新加载（）tableView viewController2。

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    selectedTableString = cell.textLabel.text;

    if (cell.accessoryType==UITableViewCellAccessoryNone)
    {
        cell.accessoryType=UITableViewCellAccessoryCheckmark;
        if (prev!=indexPath.row) {
            cell=[tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:prev inSection:0]];
            cell.accessoryType=UITableViewCellAccessoryNone;
            prev=indexPath.row;
        }
    }
    else{
        cell.accessoryType=UITableViewCellAccessoryNone;
    }

    NSLog(@"selectedTableString is %@",selectedTableString);

    NSLog(@"posting notification");
    [[NSNotificationCenter defaultCenter] postNotificationName:@"TTSelectedList" object:selectedTableString];
}

然后在viewController2：

- (void)selectedList:(NSNotification*)notification
{
    NSLog(@"received notification");

    theString = [notification object];

    NSLog(@"thestring is %@", theString);

    // getting an NSString
    selectedTableString = theString;

    if ([selectedTableString isEqualToString:@"Italy"]) {
        jsonStringCountry = @"http://***/v1/public/cities?country=it";
        [mainTable reloadData];
    }
    else if ([selectedTableString isEqualToString:@"Spain"]) {
        jsonStringCountry = @"http://***/v1/public/cities?country=es";
        [mainTable reloadData];
    }
    else if ([selectedTableString isEqualToString:@"UK"]) {
        jsonStringCountry = @"http://***/v1/public/cities?country=uk";
    }
    else if ([selectedTableString isEqualToString:@"Brazil"]) {
        jsonStringCountry = @"http://***/v1/public/cities?country=br";
    }

    NSLog(@"from two table selectedTableString %@",selectedTableString);

    [mainTable reloadData];
}