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 I am sending the date from to the peripheral by using the below code.

NSString* alternative = [NSString stringWithFormat:@"hello"];
NSData *dataToSend = [alternative dataUsingEncoding:NSUTF8StringEncoding];
[self.discoveredPeripheral writeValue:dataToSend forCharacteristic:self.discoveredCharacteristics type:CBCharacteristicWriteWithResponse];

发送时调用委托方法。

- (void)peripheral:(CBPeripheral *)iPeripheral didWriteValueForCharacteristic:(CBCharacteristic *)iCharacteristic error:(NSError *)iError {

    NSLog(@"didWriteValue characteristic.value: %@ ", iCharacteristic.value);

    NSLog(@"Error = %@", iError);

}

但是，在这里我得到空值。

我也可以在外围应用程序中接收，

- (void)peripheralManager:(CBPeripheralManager *)iPeripheral didReceiveWriteRequests:(NSArray *)iRequests {


    [iPeripheral respondToRequest:[iRequests objectAtIndex:0] withResult:CBATTErrorSuccess];
    CBATTRequest *aRequest = iRequests[0];
    NSData *aData = aRequest.value;
    NSDictionary *aResponse = (NSDictionary *)[NSJSONSerialization JSONObjectWithData:aData options:NSJSONReadingMutableContainers error:nil];

    NSLog(@"Received Data = %@", aResponse);
}

接收结果值相同为空。

- (void)peripheral:(CBPeripheral *)iPeripheral didWriteValueForCharacteristic:(CBCharacteristic *)iCharacteristic error:(NSError *)iError

将数据发送到外围设备时无法识别问题。任何答案都会对我有很大帮助

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