iOS开发 -------- 网络状态监测

一 示例代码

---

需要先把第三方Reachability下载导入到工程中  下载网址  https://github.com/tonymillion/Reachability

1 封装网络工具类 NetworkTool

 //
 //  NetworkTool.h
 //  网络状态检测
 //
 //  Created by lovestarfish on 15/11/7.
 //  Copyright © 2015年 S&G. All rights reserved.
 //

 #import <Foundation/Foundation.h>

 @interface NetworkTool : NSObject

 /**
  *  是否WIFI
  */
 + (BOOL)IsEnableWIFI;

 /**
  *  是否3G
  */
 + (BOOL)IsEnable3G;

 @end

 //
 //  NetworkTool.m
 //  网络状态检测
 //
 //  Created by lovestarfish on 15/11/7.
 //  Copyright © 2015年 S&G. All rights reserved.
 //

 #import "NetworkTool.h"
 #import "Reachability.h"

 @implementation NetworkTool
 //是否WIFI
 + (BOOL)IsEnableWIFI {
     return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
 }

 //是否3G
 + (BOOL)IsEnable3G {
     return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);
 }

 @end

2 在viewController类中导入我们封装好的网络工具类

 //
 //  RootViewController.m
 //  网络状态检测
 //
 //  Created by lovestarfish on 15/11/7.
 //  Copyright © 2015年 S&G. All rights reserved.
 //

 #import "RootViewController.h"
 #import "Reachability.h"
 #import "NetworkTool.h"

 @interface RootViewController ()

 @property (nonatomic,strong) Reachability *reachability;

 @end

 @implementation RootViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     //监听网络状态发生改变的通知
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChanged) name:kReachabilityChangedNotification object:nil];

     //获得Reachability对象
     self.reachability = [Reachability reachabilityForInternetConnection];

     //开始监控网络
     [self.reachability startNotifier];
 }

 /**
  *  网络状态发生改变时
  */
 - (void)networkStateChanged {
     [self checkNetworkState];
 }

 /**
  *  检测当前网络状态
  */
 - (void)checkNetworkState {
     if ([NetworkTool IsEnable3G]) {
         [self presentAlertController:@"已经连接WIFI"];
         NSLog(@"WIFi环境");
     } else if ([NetworkTool IsEnable3G] ) {
         [self presentAlertController:@"当前为手机自带网络"];
         NSLog(@"手机自带网络");
     } else {
         [self presentAlertController:@"网络不可用"];
         NSLog(@"没有网络");
     }
 }

 /**
  *  网络发生变化时以弹出框消息提示用户
  */
 - (void)presentAlertController:(NSString *)message {
     UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"提示" message:message preferredStyle:UIAlertControllerStyleAlert];
     UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

     }];
     [alertC addAction:action];
     [self presentViewController:alertC animated:YES completion:nil];
 }

 /**
  *  在合适的时机移除通知
  */
 - (void)dealloc {
     [self.reachability stopNotifier];
     [[NSNotificationCenter defaultCenter] removeObserver:self];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
 }

 @end

二 实现效果

---