iOS 获取本地设备IP地址

#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;}