網上有許多類似的帖子、在搜索了資料以后、覺得下面的方法是最簡單的、

使用的時候直接把類方法拖到自己新建的分類中就行、

.h文件

#import <Foundation/Foundation.h>

@interface NSObject (Getip)

+ (NSString *)deviceIPAdress;

@end

.m文件

#import "NSObject+GetIP.h"

#include <ifaddrs.h>

#include <arpa/inet.h>

上面的兩個頭文件一定要導入

@implementation NSObject (GetIP)

+ (NSString *)deviceIPAdress {
    NSString *address = @"an error occurred when obtaining ip address";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    
    success = getifaddrs(&interfaces);
    
    if (success == 0) { // 0 表示獲取成功
        
        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;
        }
    }
    
    freeifaddrs(interfaces);
    
//    NSLog(@"手機的IP是：%@", address);
    
    return address;
}


@end