ios – 从PubNub消息中检索内容

概述我可以使用PubNub成功发送和接收消息,当我尝试显示消息中的内容并加载UITableViewCell的UITextView时会出现问题. 第二个TEST LOG写出了我从iPhone发送的整个消息(我已经使用开发控制台尝试过了),但在此之后应用程序崩溃了. [__NSCFDictionary length]: unrecognized selector sent to instance 我知道字 我可以使用PubNub成功发送和接收消息,当我尝试显示消息中的内容并加载UItableVIEwCell的UITextVIEw时会出现问题.

第二个TEST LOG写出了我从iPhone发送的整个消息(我已经使用开发控制台尝试过了),但在此之后应用程序崩溃了.

[__NSCFDictionary length]: unrecognized selector sent to instance

我知道字典有问题,但我无法弄清楚.我只使用一个NSDictionary作为我通过PubNub发送的消息,它“到达”控制台,因此我认为它正常工作.正如你在代码中看到的那样,我尝试了一些变化,但没有任何成功.

UPDATE

如果我发送Nsstring而不是NSDictionary,它会工作.

@interface VIEwController ()@property (nonatomic,strong) Nsstring *myIncomeMessage;@property (nonatomic,strong) Nsstring *messageFromDict;@property (nonatomic,strong) NSArray *twoChannels;@property (nonatomic,strong) NSDictionary *messagePbnb;//@property (nonatomic,strong) PNMessage *messageNew;@end@implementation VIEwController- (voID)vIEwDIDLoad{    [super vIEwDIDLoad];    PNChannel *channel_2 = [PNChannel channelWithname:current.username shouldobservePresence:NO];    PNChannel *channel_1 = [PNChannel channelWithname:self.messageRecipIEnt shouldobservePresence:NO];    [PubNub subscribeOnChannels:self.twoChannels];    [PubNub requestHistoryForChannel:channel_1 from:nil to:nil limit:100 reverseHistory:YES];    [PubNub requestHistoryForChannel:channel_2 from:nil to:nil limit:100 reverseHistory:YES];    [[PNObservationCenter defaultCenter] addMessageReceiveObserver:self withBlock:^(PNMessage *message) {        NSLog(@"OBSERVER: Channel: %@,Message: %@",message.channel.name,message.message);        NSLog(@"Sample TEST LOG %@",message.message);        self.myIncomeMessage = message.message;        NSLog(@"Second TEST LOG %@",self.myIncomeMessage);   //   self.messageFromDict = [Nsstring stringWithFormat:keyMessage,self.messagePbnb];   //   self.messageFromDict = [Nsstring stringWithFormat:keyMessage,message];    }];    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(reloadtable) userInfo:nil repeats:YES];    [self setupUIForinput];}- (IBAction) inputContent {    Nsstring *messageContent = self.textVIEw.text;    PNChannel *channel_1 = [PNChannel channelWithname:self.messageRecipIEnt shouldobservePresence:NO];    PNChannel *channel_2 = [PNChannel channelWithname:senderUser.username shouldobservePresence:NO];    self.twoChannels = @[channel_1,channel_2];    [PubNub subscribeOnChannels: self.twoChannels];    self.messagePbnb = @{ @"keyMessage": messageContent,@"keySenderUser": self.senderUser.username,@"keyRecIEverChannel": self.messageRecipIEnt} ;    [PubNub sendMessage: self.messagePbnb tochannel:channel_1];    [PubNub sendMessage: self.messagePbnb tochannel:channel_2];    [self.textVIEw resignFirstResponder];    [self reloadinputVIEws];}-(NSInteger) tableVIEw:(UItableVIEw *)tableVIEw numberOfRowsInSection:(NSInteger)section {    return 10;}-(UItableVIEwCell *) tableVIEw:(UItableVIEw *)tableVIEw cellForRowAtIndexPath:(NSIndexPath *)indexPath {    OutputtableVIEwCell *cell = [tableVIEw dequeueReusableCellWithIDentifIEr:@"cellThree"];    cell.textoutput.text = self.myIncomeMessage;-(voID)reloadtable{    [tableVIEwThree reloadData];}

解决方法 @sabin,这是一个例子,使用观察者 – 你可以通过委托做类似的事情：

[[PNObservationCenter defaultCenter] addMessageReceiveObserver:self                                                     withBlock:^(PNMessage *message) {     ID messageData = message.message;     if ([messageData isKindOfClass:[NSDictionary class]]) {     Nsstring *messageString = [Nsstring stringWithFormat:@"foo: %@,and bar: <%@>",[(NSDictionary *)messageData valueForKey:@"foo"],[(NSDictionary *)messageData valueForKey:@"bar"]];     } }];

如果您随后从Web控制台(pubnub.com/console)发布了此内容：

{"foo":"hey","bar":"you!"}

您将能够从上面的代码(通过messageString)呈现一个字符串,如下所示：

foo: hey,and bar: you!

如果有帮助,请告诉我！

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