NSLog打印出来的如下图：
advertisementData[@"kCBAdvDataServiceData"][@"B000"]取不到尖括号这一部分的值，感觉是类型的问题，百度、Google了半天也没找到答案，请大牛来帮忙，感谢！
解决方案
昨天晚上找到的解决办法：
NSString *serviceData = [advertisementData[@"kCBAdvDataServiceData"] description];NSString *MACString = [serviceData substringWithRange:NSMakeRange(14, 13)];今天看到CBAdvertisementDataServiceDataKey的注释中说key是CBUUID对象，改成下面的代码了，value是NSData对象
NSDictionary *serviceData = advertisementData[CBAdvertisementDataServiceDataKey];NSData *MACData = serviceData[[CBUUID UUIDWithString:@"B000"]];NSString *MACString = [MACData description];下午再次改进
NSDictionary *serviceData = advertisementData[CBAdvertisementDataServiceDataKey];NSData *MACData = serviceData[[CBUUID UUIDWithString:@"B000"]];Byte *MACDataByte = (Byte *)MACData.bytes;NSMutableString *MAC = [NSMutableString stringWithString:@""];for(int i = 0; i < [MACData length]; i++) { if (i > 0) { [MAC appendString:@":"]; } [MAC appendString:[NSString stringWithFormat:@"%x", MACDataByte[i]]];}