didSelectRowAtIndexPath无法与NSNotificationCenter一起使用

时间:2013-07-05 00:55:53

标签: ios objective-c json ipad jsonmodel

我有一个我正在制作的MasterDetail应用程序,用于显示玩家(如运动)和详细统计数据。从Postgres数据库调用播放器列表,并使用JSONModel从JSON解析。到目前为止,我能够从Postgres DB获取所需的所有数据,并在MasterView中完美显示。我正在使用NSNotificationCenter将数据从Master传递到Detail视图(我使用MasterView中的函数获取数据)。我能够准确地将数据传递到Detail视图,但由于某种原因,我的didSelectRowAtIndexPath无法正常工作。我显然做错了什么,但我不知道它是什么。以下是代码的重要部分:

在MasterViewController.m viewDidAppear中:

-(void)viewDidAppear:(BOOL)animated
{

//fetch the feed from the Postgres Database

[JSONHTTPClient getJSONFromURLWithString:@"http://myurl" completion:^(NSDictionary *json, JSONModelError *err) {
    NSError* error = nil;
    _feed = [[PostgresFeed alloc]initWithDictionary:json error:&error];

    //Print the data fethced to NSLog in JSON format
    NSLog(@"Players: %@", _feed.players);

    [[NSNotificationCenter defaultCenter] postNotificationName:@"myNotification" object:nil userInfo:json];

    //reload the table view after data collected
    [self.tableView reloadData];

    }];
}

我在我的DetailViewController.m中收集该信息,如下所示:

- (void)handleNotification:(NSNotification *) notification
{
    NSLog(@"%@", notification.userInfo);
    NSArray *playerData = [notification.userInfo objectForKey:@"player"];
    NSDictionary *firstElement = [playerData objectAtIndex:0];

    nameLabel.text = [firstElement objectForKey:@"name"];

}

,然后是我的MasterViewController中的didSelectRowAtIndexPath

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

[tableView deselectRowAtIndexPath:indexPath animated:YES];


Player *selectedPlayer = [_players objectAtIndex:indexPath.row];

if (_delegate) {
    [_delegate selectedPlayer:slectedPlayer];
    }
}

你有它。如果您希望我发布更多内容,或者如果您需要DetailViewController.m,MasterViewController.h或PlayerSelectionDelegate.h中的代码,请告诉我。

作为一个注释,我最初是根据Ray Wenderlich iPad SplitView应用程序教程创建的。是的,我是这一切的新手。

1 个答案:

答案 0 :(得分:1)

您需要将NSNotification置于

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

[tableView deselectRowAtIndexPath:indexPath animated:YES];
 //Here you have the NSDictionary from the json
[JSONHTTPClient getJSONFromURLWithString:@"http://myurl" completion:^(NSDictionary *json, JSONModelError *err) {
    NSError* error = nil;
_feed = [[PostgresFeed alloc]initWithDictionary:json error:&error];

//Print the data fethced to NSLog in JSON format
NSLog(@"Players: %@", _feed.players);
[JSONHTTPClient getJSONFromURLWithString:@"http://myurl" completion:^(NSDictionary *json, JSONModelError *err) {
NSError* error = nil;
_feed = [[PostgresFeed alloc]initWithDictionary:json error:&error];

//Print the data fethced to NSLog in JSON format
NSLog(@"Players: %@", _feed.players);
//Assuming that you have the players in the same order as your list
  [[NSNotificationCenter defaultCenter] postNotificationName:@"myNotification" object:nil userInfo:[[json objectForKey:@"players"]objectAtIndex:indexPath.row]];
 }];


Player *selectedPlayer = [_players objectAtIndex:indexPath.row];

if (_delegate) {
[_delegate selectedPlayer:slectedPlayer];
}
}

在你的DetailViewController中:

- (void)handleNotification:(NSNotification *) notification
{
NSLog(@"%@", notification.userInfo);

 nameLabel.text = [notification.userInfo objectForKey:@"name"];

}