在iOS中使用PubNub历史API

如何使用历史API接收通道的历史记录？在文档中，它说调用

[PubNub requestHistoryForChannel:myChannel from:nil to:nil limit:100 reverseHistory:YES]成功返回一个数组，但我的编译器断言返回值无效。该方法和相关方法的文档中说它们“从历史中获取消息”，但我似乎不知道这些消息被提取到哪里。是否存在将消息发送到的委托方法？请帮帮我

多谢各位

编辑

现在正在接收消息，但不是按照指定的时间间隔。我正在接收频道上的所有消息

- (void)subscribePostChannels:(NSArray *)results withError:(NSError *)error
{
    if (!error) {
        static int SECONDS_IN_TEN_DAYS = 864000;
        for (PFObject *post in results) {
            if ([post.createdAt timeIntervalSinceNow] > (-1) * SECONDS_IN_TEN_DAYS) {
                [self.channelsToSubscribe addObject:post.objectId];
                NSString *pushChannel = [NSString stringWithFormat:@"channel_%@", post.objectId];
                [[PFInstallation currentInstallation] addUniqueObject:pushChannel forKey:@"channels"];
            }
        }
        NSArray *channels = [PNChannel channelsWithNames:self.channelsToSubscribe];
        [PubNub subscribeOnChannels:channels];
        // Now retrieve messages
        NSDate *lastLogin = [PFUser currentUser][@"lastActive"];
        for (PNChannel *channel in channels) {
            [PubNub requestHistoryForChannel:channel from:[PNDate dateWithDate:lastLogin] includingTimeToken:YES withCompletionBlock:^(NSArray *array, PNChannel *channel, PNDate *fromDate, PNDate *toDate, PNError *error) {
                if (!error) {
                    NSLog(@"Last Active: %@", [PFUser currentUser][@"lastActive"]);
                    if (channel == [channels lastObject]) {
                        [PFUser currentUser][@"lastActive"] = [NSDate date];
                        [[PFUser currentUser] saveInBackground];
                    }
                } else {
                    NSLog(@"Error Fetching History: %@", error);
                }
            }];
        }
    } else {
        NSLog(@"Error finding messages. Post channels not subscribed.");
    }
}



- (void)subscribePostChannels:(NSArray *)results withError:(NSError *)error
{
    static int SECONDS_IN_TEN_DAYS = 864000;
    for (PFObject *post in results) {
        if ([post.createdAt timeIntervalSinceNow] > (-1) * SECONDS_IN_TEN_DAYS) {
            [self.channelsToSubscribe addObject:post.objectId];
            NSString *pushChannel = [NSString stringWithFormat:@"channel_%@", post.objectId];
            [[PFInstallation currentInstallation] addUniqueObject:pushChannel forKey:@"channels"];
        }
    }
    NSArray *channels = [PNChannel channelsWithNames:self.channelsToSubscribe];
    [PubNub subscribeOnChannels:channels];
    // Now retrieve messages
    for (PNChannel *channel in channels) {
        NSDate *lastLogin = [PFUser currentUser][@"lastActive"];
        [PubNub requestHistoryForChannel:channel from:[PNDate dateWithDate:lastLogin] to:nil];
    }
}

日志消息表明lastActive发生在从历史记录接收到的消息之后。
这似乎对我有效，如果对您有效，请告诉我：

在my ViewController.m中：

PNConfiguration *myConfig = [PNConfiguration configurationForOrigin:@"pubsub.pubnub.com" publishKey:@"demo" subscribeKey:@"demo" secretKey:@"demo"];

[PubNub setConfiguration:myConfig];
[PubNub connectWithSuccessBlock:^(NSString *origin) {

    PNLog(PNLogGeneralLevel, self, @"{BLOCK} PubNub client connected to: %@", origin);

    PNChannel *myChannel = [PNChannel channelWithName:@"a" shouldObservePresence:YES];
    [PubNub requestHistoryForChannel:myChannel from:nil to:nil limit:100];

}

                     errorBlock:^(PNError *connectionError) {
    if (connectionError.code == kPNClientConnectionFailedOnInternetFailureError) {
        PNLog(PNLogGeneralLevel, self, @"Connection will be established as soon as internet connection will be restored");
    }

    // UIAlert code, etc

}];

在我的AppDelegate中：

- (void)pubnubClient:(PubNub *)client didReceiveMessageHistory:(NSArray *)messages forChannel:(PNChannel *)channel
    startingFrom:(NSDate *)startDate to:(NSDate *)endDate {

PNLog(PNLogGeneralLevel, self, @"PubNub client received history for %@ starting from %@ to %@: %@", channel,
        startDate, endDate, messages);

}

我看到代表的输出，如：

2014-07-31 11:12:41.076 PubNubDemo[70859:60b] AppDelegate (0x8e25eb0) PubNub client received history for PNChannel(0x93261e0) a starting from PNDate (0x9330d90) <date: 2014-07-31 18:10:43 +0000; time token: 14068302439622999> to PNDate (0x9330e30) <date: 2014-07-31 18:12:40 +0000; time token: 14068303601434709>: (
"PNMessage (0x9329650): <message: ***********.... 1861 - 2014-07-31 11:10:43, date: (null), channel: a>",
"PNMessage (0x9330830): <message: ************... 1862 - 2014-07-31 11:10:45, date: (null), channel: a>",
"PNMessage (0x9330850): <message: *************.. 1863 - 2014-07-31 11:10:46, date: (null), channel: a>",
"PNMessage (0x9330870): <message: **************. 1864 - 2014-07-31 11:10:47, date: (null), channel: a>",

2014-07-31 11:12:41.076 PubNubDemo[70859:60b]AppDelegate（0x8e25eb0）PubNub客户端收到了从PNDate（0x9330d90）到PNDate（0x9330e30）的PNChannel（0x93261e0）a的历史记录：(
“PNMessage（0x9329650）：”，
“PNMessage（0x9330830）：”，
“PNMessage（0x9330850）：”，
“PNMessage（0x9330870）：”，

有关代表的更多信息，请点击此处：


还有更多关于观察员的信息：


这能指引你正确的方向吗

geremy
我的第二个问题是，显示的是所有消息，而不是我想要的消息，这是因为PubNub History API的设置如下：

[PubNub requestHistoryForChannel:myChannel from:nil to:nil limit:100]; 

from:
日期被认为是开始回溯的日期，然后您检索该日期之前的所有邮件，直到
to:
日期。我认为
from:
应该是时间上较早的日期，但事实并非如此

因此，对于我来说，从上次登录到当前需要使用的日期，我将接收所有消息：

[PubNub requestHistoryForChannel:myChannel from:nil to:[PNDate dateWithDate:lastLogin] limit:100];

感谢PubNub support的Craig帮我解决了这个问题。
对我来说不起作用。我将编辑原始帖子，以展示我是如何尝试调用它的。感谢您编辑原始帖子以澄清问题。您正在运行哪些调用subscribePostChannels的代码：withError:？我在您的上述代码中看到的主要问题：1）订阅不会运行，除非您已经通过connect（）方法连接到PubNub。您是否已使用未提供的代码连接到其他地方？2） 如果您已经连接，则嵌入历史记录调用的连接完成块将永远不会执行，因为您已经连接。是否将[PubNub requestHistoryForChannel:channel from:[PNDate dateWithDate:lastLogin]移动到：nil]；从连接成功块内部到连接块外部，在您的订阅呼叫之后，使事情正常进行？是的，我已经连接。我连接ApplicationIDFinishLaunching中的第一件事是使用选项OK，如果您已经连接，则必须在第二个连接请求的成功块中删除历史记录调用。这能为您解决问题吗？