取消订阅频道，仍然在频道上

我正在使用PubNub作为IOS应用程序（IOS SDK 8.0）。 当我尝试取消订阅“applicationDidEnterBackground”事件中的频道时，我得到以下控制台输出。 它说该频道已取消订阅，但当我从管理控制台检查时，我仍然在频道上。 你能就此提出一些建议吗？

这是我在“applicationDidEnterBackground”中使用的行：

PubNub.unsubscribeFromChannel(channelToReceive,{(list, err:PNError!)-> Void in if(err != nil){ println(err.localizedFailureReason) } else { println("Unsubscribed...") } }) 

这是“applicationDidEnterBackground”事件之后的PubNub控制台输出：

 2014-11-08 14:47:16.585 Chat[263:60b] PubNub (0x14d7a2b0) TRYING TO UNSUBSCRIBE FROM CHANNELS: ( "PNChannel(0x14d28150) b905359780766" ) (STATE: 'connected') 2014-11-08 14:47:16.587 Chat[263:60b] PubNub (0x14d7a2b0) UNSUBSCRIBE FROM CHANNELS (STATE: 'connected') 2014-11-08 14:47:16.590 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] LEAVING SPECIFIC SET OF CHANNELS... (STATE: 10) 2014-11-08 14:47:16.625 Chat[263:60b] PubNub (0x14d7a2b0) WILL UNSUBSCRIBE FROM CHANNELS: ( "PNChannel(0x14d28150) b905359780766", "PNChannelPresence(0x14dc64f0) b905359780766-pnpres" ) (STATE: 'connected') 2014-11-08 14:47:16.632 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::WRITE] WRITE BUFFER CONTENT (STATE: 33683456) 2014-11-08 14:47:16.640 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] WILL START REQUEST PROCESSING:  (STATE: 8) 2014-11-08 14:47:16.645 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] RECONNECTING BY REQUEST... (STATE: 8) 2014-11-08 14:47:16.668 Chat[263:60b] PNReachability (0x14d88c00) PUBNUB SERVICES REACHABILITY CHANGED W/O EVENT [CONNECTED? 1 | NETWORK ADDRESS: 192.168.1.6](FLAGS: 65538) 2014-11-08 14:47:16.673 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] TRYING TO RECONNECT... (STATE: 100792320) 2014-11-08 14:47:16.677 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] DESTROYING STREAMS... (STATE: 100792328) 2014-11-08 14:47:16.684 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] UNSCHEDULE REQUEST SENDING (32795e5c-a2cb-475b-993a-61077ea21744) (STATE: 67237896) 2014-11-08 14:47:16.690 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] DID CANCEL REQUEST:  (STATE: 0) 2014-11-08 14:47:16.714 Chat[263:60b] PNReachability (0x14d88c00) PUBNUB SERVICES REACHABILITY CHANGED W/O EVENT [CONNECTED? 1 | NETWORK ADDRESS: 192.168.1.6](FLAGS: 65538) 2014-11-08 14:47:16.720 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::READ] DESTROYING... (STATE: 129032) 2014-11-08 14:47:16.726 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::READ] DESTROYED. (STATE: 126984) 2014-11-08 14:47:16.731 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::WRITE] DESTROYING... (STATE: 126984) 2014-11-08 14:47:16.742 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::WRITE] DESTROYED. (STATE: 122888) 2014-11-08 14:47:16.748 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] READ AND WRITE STREAMS DESTROYED (STATE: 12582920) 2014-11-08 14:47:16.757 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::WRITE] WRITE CANCELED (STATE: 12582920) 2014-11-08 14:47:29.679 Chat[263:60b] PubNub (0x14d7a2b0) HANDLE APPLICATION ENTERED BACKGROUND (STATE: 'connected') 2014-11-08 14:47:36.587 Chat[263:60b] PubNub (0x14d7a2b0) APPLICATION CAN'T RUN IN BACKGROUND (STATE: 'connected') 2014-11-08 14:47:36.591 Chat[263:60b] PNReachability (0x14d88c00) REACHABILITY OBSEVATION SUSPENDED 2014-11-08 14:47:36.594 Chat[263:60b] PubNub (0x14d7a2b0) SUSPENDING... (STATE: 'connected') 2014-11-08 14:47:36.597 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] TRYING TO SUSPEND (STATE: 10) 2014-11-08 14:47:36.600 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] SUSPENDING... (STATE: 10) 2014-11-08 14:47:36.602 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] TRYING TO DISCONNECT... (BY USER REQUEST? 0) (STATE: 12582912) 2014-11-08 14:47:36.604 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::READ] DISCONNECTING... (STATE: 12582912) 2014-11-08 14:47:36.606 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] HANDLE STREAM CONNECTION CLOSED (STATE: 8912896) 2014-11-08 14:47:36.611 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier::WRITE] DISCONNECTING... (STATE: 8912896) 2014-11-08 14:47:36.613 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] HANDLE STREAM CONNECTION CLOSED (STATE: 1572864) 2014-11-08 14:47:36.615 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] DISCONNECTED (STATE: 12582912) 2014-11-08 14:47:36.617 Chat[263:60b] PNConnection (0x14d5cd40) [CONNECTION::PNMessagingConnectionIdentifier] NOTIFY DELEGATE ABOUT DISCONNECTION (STATE: 12582912) 2014-11-08 14:47:36.619 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] HANDLE DISCONNECTION EVENT (STATE: 24) 2014-11-08 14:47:36.634 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] LEAVE REQUEST COMPLETED (STATE: 0) 2014-11-08 14:47:36.637 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] PRESENCE 'LEAVE' REQUEST ERROR: Domain=com.pubnub.pubnub; Code=107; Description="PubNub client can't perform request"; Reason="Looks like the client lost it's net connection"; Fix suggestion="Ensure that all network configuration (including any proxy) is correct, and try again."; Associated object=(null)\nCHANNELS: ( "PNChannel(0x14d28150) b905359780766", "PNChannelPresence(0x14dc64f0) b905359780766-pnpres" )\n(STATE: 0) 2014-11-08 14:47:36.641 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] UNSUBSCRIBED FROM CHANNELS: ( "PNChannel(0x14d28150) b905359780766", "PNChannelPresence(0x14dc64f0) b905359780766-pnpres" )\n(STATE: 0) 2014-11-08 14:47:36.648 Chat[263:60b] PubNub (0x14d7a2b0) SHOULD CHANNEL PNMessagingConnectionIdentifier (0x14d69800) NOTIFY DELEGATE? 0 (STATE: 'suspended') 2014-11-08 14:47:36.651 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] HANDLE SUSPENSION EVENT (STATE: 24) 2014-11-08 14:47:36.653 Chat[263:60b] PNMessagingChannel (0x14d69800) [CHANNEL::PNMessagingConnectionIdentifier] SUSPENDED (STATE: 160) 2014-11-08 14:47:36.655 Chat[263:60b] PNServiceChannel (0x14d90d00) [CHANNEL::PNServiceConnectionIdentifier] TRYING TO SUSPEND (STATE: 8) 2014-11-08 14:47:36.665 Chat[263:60b] PNServiceChannel (0x14d90d00) [CHANNEL::PNServiceConnectionIdentifier] SUSPENDING... (STATE: 8) 2014-11-08 14:47:36.671 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier] TRYING TO DISCONNECT... (BY USER REQUEST? 0) (STATE: 2226176) 2014-11-08 14:47:36.675 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier::READ] DISCONNECTING... (STATE: 2201600) 2014-11-08 14:47:36.679 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier::READ] DESTROYING... (STATE: 2725888) 2014-11-08 14:47:36.699 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier::READ] DESTROYED. (STATE: 2723840) 2014-11-08 14:47:36.703 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier] HANDLE STREAM CONNECTION CLOSED (STATE: 2723840) 2014-11-08 14:47:36.706 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier::WRITE] DISCONNECTING... (STATE: 2723840) 2014-11-08 14:47:36.710 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier::WRITE] DESTROYING... (STATE: 3772416) 2014-11-08 14:47:36.718 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier::WRITE] DESTROYED. (STATE: 3768320) 2014-11-08 14:47:36.721 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier] HANDLE STREAM CONNECTION CLOSED (STATE: 3768320) 2014-11-08 14:47:36.724 Chat[263:60b] PNConnection (0x14d959d0) [CONNECTION::PNServiceConnectionIdentifier] SUSPENDED (STATE: 12582912) 2014-11-08 14:47:36.727 Chat[263:60b] PNServiceChannel (0x14d90d00) [CHANNEL::PNServiceConnectionIdentifier] HANDLE SUSPENSION EVENT (STATE: 24) 2014-11-08 14:47:36.739 Chat[263:60b] PNServiceChannel (0x14d90d00) [CHANNEL::PNServiceConnectionIdentifier] SUSPENDED (STATE: 160) 

提前致谢。

Answer 1

好吧，如果您的应用程序无法在后台持续运行，则当应用程序转移到后台执行状态时，您无法调用此类命令。 在将PubNub客户端与您的应用程序一起暂停之前，您可以尝试使用此回调来执行少量请求：

 - (void)pubnubClient:(PubNub *)client willSuspendWithBlock:(void(^)(void(^)(void(^)(void))))preSuspensionBlock { if ([client isConnected]) { preSuspensionBlock(^(void(^completionBlock)(void)){ // Do last calls here // Always call this block as soon as required amount of tasks completed. completionBlock(); }]; }); } } 

Answer 2

您仍然连接，因为pubnub在后台没有发送任何通知。 更棘手的是，它会在回到前台时发送排队的通知。

为了让Pubnub在后台运行，您必须启用适当的后台模式。 需要websockets的人（pubnub也使用它们）在左侧选择您的项目并转到Capabilities选项卡。 在那里，您将找到可以启用的所有后台模式。 对于Pubnub，我听到VOIP和位置更新将起作用。

我个人选择位置更新。 请注意，如果您不使用位置服务进行实际位置服务，Apple将拒绝您的应用。 正在与Pubnub进行一些研究对我来说很好，但是当我部署时，我可能会切换到HTTP请求，因为它们可以在后台运行。