iOS 获取本地设备IP地址

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#import <ifaddrs.h>
#import <arpa/inet.h>
// Get IP Address
- (NSString *)getIPAddress {    
  NSString *address = @"error";
  struct ifaddrs *interfaces = NULL;
  struct ifaddrs *temp_addr = NULL;
  int success = 0;
  // retrieve the current interfaces - returns 0 on success
  success = getifaddrs(&interfaces);
  if (success == 0) {
      // Loop through linked list of interfaces
      temp_addr = interfaces;
      while(temp_addr != NULL) {
          if(temp_addr->ifa_addr->sa_family == AF_INET) {
              // Check if interface is en0 which is the wifi connection on the iPhone
              if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                  // Get NSString from C String
                  address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];               
              }
          }
          temp_addr = temp_addr->ifa_next;
      }
  }
  // Free memory
  freeifaddrs(interfaces);
  return address;
  }