Question

我目前正在使用XCode中的Multipeer Connectivity Framework获取iPad应用程序。

我想用框架发送消息（NSStrings，Booleans和NSArrays）并且Strings工作正常，但是我需要某种类型检查来将NSData对象转换为String，Array等。

这就是我的didReceiveData方法：

- (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，所以我可以将NSData对象转换为NSString或NSArray OR等。

我该如何解决这个问题？

提前致谢！

编辑：这就是数组的发送方式：

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

    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arrayToSend];

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

}

Answer 1

您可以将NSKeyedArchiver用于您发送的各种对象（字符串，数组，...）。然后，您可以使用

检查接收方

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 ...
}

Answer 2

//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 ...
}

类型检查：如何检查NSData是否是NSArray？

2 个答案: