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我目前正在为 iPad 应用程序使用 XCode 中的 Multipeer Connectivity Framework。

我想使用框架（NSStrings、Booleans 和 NSArrays）发送消息，并且字符串工作正常，但我需要某种类型检查来将 NSData 对象转换为字符串、数组等。

这就是我的 didReceiveData 方法的样子：

- (void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID{

    NSString *message = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSMutableArray *recievedArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];

    if ([message isEqualToString:@"PeerIsConnected"]) {
        NSLog(@"Peer sended: Connected!");
        self.connectionIsOn = TRUE;
        dispatch_async(dispatch_get_main_queue(),^{
            [self changeConnectionButton:TRUE];
        });

        NSLog(@"Connection is on (data received) : %@", (self.connectionIsOn) ? @"YES" : @"NO");
    }

    if ([message isEqualToString:@"Disconnect"]) {
        NSLog(@"Peer sended: Disconnect!");
        self.connectionIsOn = FALSE;
        dispatch_async(dispatch_get_main_queue(),^{
            [self changeConnectionButton:FALSE];
        });
    }


    if ([message isEqualToString:@"GoWasClicked"]) {

        self.muliplayergameIsOn = TRUE;
        self.myTurn = TRUE;

        self.startDate = [NSDate date];
        self.stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/10.0
                                                               target:self
                                                             selector:@selector(updateTimer)
                                                             userInfo:nil
                                                              repeats:YES];
}

我需要一些 if case，以便我可以将 NSData 对象转换为 NSString OR NSArray OR 等。

我怎么解决这个问题？

提前致谢！

编辑：这是发送数组的方式：

- (void) sendArray:(NSMutableArray *) arrayToSend{

    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arrayToSend];

    NSError *error;
    [self.mySession sendData:data toPeers:[self.mySession connectedPeers] withMode:MCSessionSendDataUnreliable error:&error];

}
4

2 回答 2

1

您可以NSKeyedArchiver用于您发送的所有类型的对象（字符串、数组、...）。然后你可以在接收方检查

id receivedObject = [NSKeyedUnarchiver unarchiveObjectWithData:data];
if ([receivedObject isKindOfClass:[NSArray class]]) {
    NSArray *receivedArray = receivedObject;
    // handle array ...

} else if ([receivedObject isKindOfClass:[NSString class]]) {
    NSString *receivedString = receivedObject;
    // handle string ...
}
于 2014-01-11T13:46:47.683 回答
1 
//Added one more condition here...

id receivedObject = [NSKeyedUnarchiver unarchiveObjectWithData:data];
if ([receivedObject isKindOfClass:[NSArray class]]) {
    NSArray *receivedArray = receivedObject;
    // handle array ...
}
else if ([receivedObject isKindOfClass:[NSDictionary class]]) {
    NSString *receivedString = receivedObject;
    // handle dictionary ...
}
else if ([receivedObject isKindOfClass:[NSString class]]) {
    NSString *receivedString = receivedObject;
    // handle string ...
}
于 2018-05-17T05:36:04.590 回答