1

我有两个班级，A 班和 B 班。A 班的任务与聊天无关，但它需要对收到的聊天消息做出反应。当消息到达时，它被存储在 NSMutableDictionary 中，即存储在 NSMutableArray 中的字典。如果收到的消息是第一个消息（[array count]==1），则显示 B 类视图，呈现 UITableView，其中数据填充有数组。一切都非常适合第一条消息。

第二条消息到达。新消息被添加到数组中（这是在 A 类中完成的），但是表没有被填充。我怎样才能实现这个目标？

编码：

A级

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
{
NSString *msg = [[message elementForName:@"body"] stringValue];
NSString *from = [[message attributeForName:@"from"] stringValue];

NSMutableDictionary *m = [[NSMutableDictionary alloc] init];
[m setObject:msg forKey:@"msg"];
[m setObject:from forKey:@"sender"];
[messarray addObject:m];


[self newMessageReceived:messarray];
}

- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender
{
NSLog(@"Method xmppStreamDidAuthenticate");
[self goOnline];
}

//- (void) newMessageReceived:(NSMutableDictionary *)message
-(void) newMessageReceived:(NSMutableArray *)messarraylocal
{
General *general = [General sharedManager];//An static class to store settings like username, and other things that must be available in the hole app.
general.numcels++;
general.messarray=messarraylocal;
  // NSString *firstmessage=[message objectForKey:@"msg"];
//NSString *from=[message objectForKey:@"sender"];    
//NSArray *listItems = [from componentsSeparatedByString:@"@"];
//NSString *fromsplit=[listItems objectAtIndex:0];
//general.firstmess=firstmessage;
//general.firstfrom=fromsplit;




if ([messarraylocal count]==1){
ChatViewController *cvc=[[ChatViewController alloc]initWithNibName:@"Chat" bundle:nil];

[[self navigationController]pushViewController:cvc animated:YES];

}
}

B类：

-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
General *general = [General sharedManager];
NSLog(@"We are in numberOfRowsInSection, de ChatViewController");
return general.messarray.count;
}

-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
General *general = [General sharedManager];

NSLog(@"We are in cellForRowAtIndexPath de ChatViewController");
//UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"];
//if(!cell){
messarray=general.messarray;
for (int i=0;i<messarray.count; i++)
{
    diccio=[messarray objectAtIndex:i];
    general.firstmess=[diccio objectForKey:@"msg"];
    general.firstfrom=[diccio objectForKey:@"sender"];

UITableViewCell *cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"UITableViewCell"];
//}
text=general.firstmess;
remite=general.firstfrom;
[[cell textLabel]setText:remite];
[[cell detailTextLabel] setText:text];

return cell;

}
}

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
{
NSString *msg = [[message elementForName:@"body"] stringValue];
NSString *from = [[message attributeForName:@"from"] stringValue];
NSLog(@"We are in didReceiveMessage of ChatViewController");
NSMutableDictionary *m = [[NSMutableDictionary alloc] init];
[m setObject:msg forKey:@"msg"];
[m setObject:from forKey:@"sender"];


[self newMessageReceived:m];
}

- (void) newMessageReceived: (NSMutableDictionary *) message// this method is NEVER called
{
General *general = [General sharedManager];
general.numcels++;
NSLog(@"numcels vale %i", general.numcels);
NSString *firstmessage=[message objectForKey:@"msg"];
NSString *from=[message objectForKey:@"sender"];    
NSArray *listItems = [from componentsSeparatedByString:@"@"];
NSString *fromsplit=[listItems objectAtIndex:0];
general.firstmess=firstmessage;
general.firstfrom=fromsplit;
NSLog(@"Message receive in ChatViewController: %@ from %@", [message objectForKey:@"msg"], fromsplit);

}

在 B 类的方法 didViewLoad 中，我这样做：

table.delegate=self;
table.dataSource=self;

但是没有结果。我知道 [table reload] 可以工作，但是......我在哪里可以做到？

任何人都可以帮助我吗？谢谢！

4

2 回答 2

0

newMessageReceived将新消息添加到全局后，在 A 类中messarray

你需要开火NSNotification

-(void) newMessageReceived:(NSMutableArray *)messarraylocal
{
    //in addition to your normal code, add the following
    [[NSNotificationCenter defaultCenter] postNotificationName:@"NewMessage" object:nil];
}

现在乙级登记观察

- (void) viewDidLoad
{
    //In addition to your normal code here add the following
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(newMessage) name:@"NewMessage" object:nil];
}

//Add this method that will call reload data
- (void) newMessage
{
    [table reloadData];
}
于 2012-06-15T12:53:08.703 回答
0

您是否将上一条消息存储在数组中...如果不是，则在您的didReceiveMessage 中：在将对象添加到数组之前放置一行...

[messarray removeAllObjects];
于 2012-06-15T13:29:02.557 回答