IOS-网络（监听网络状态）

 1 //
 2 //  BWNetWorkTool.h
 3 //  IOS_0131_检测网络状态
 4 //
 5 //  Created by ma c on 16/1/31.
 6 //  Copyright © 2016年 博文科技. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 @interface BWNetWorkTool : NSObject
12 ///是否是WiFi
13 + (BOOL)isEnableWiFi;
14 ///是否是3G
15 + (BOOL)isEnable3G;
16 
17 @end
18 
19 //
20 //  BWNetWorkTool.m
21 //  IOS_0131_检测网络状态
22 //
23 //  Created by ma c on 16/1/31.
24 //  Copyright © 2016年 博文科技. All rights reserved.
25 //
26 
27 #import "BWNetWorkTool.h"
28 #import "Reachability.h"
29 
30 @implementation BWNetWorkTool
31 
32 //是否是WiFi
33 + (BOOL)isEnableWiFi
34 {
35     return [[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] !=NotReachable;
36 }
37 //是否是3G
38 + (BOOL)isEnable3G
39 {
40     return [[Reachability reachabilityForInternetConnection] currentReachabilityStatus] !=NotReachable;
41 }
42 
43 
44 @end

  1 //
  2 //  ViewController.m
  3 //  IOS_0131_检测网络状态
  4 //
  5 //  Created by ma c on 16/1/31.
  6 //  Copyright © 2016年 博文科技. All rights reserved.
  7 //
  8 
  9 #import "ViewController.h"
 10 #import "Reachability.h"
 11 #import "BWNetWorkTool.h"
 12 
 13 @interface ViewController ()
 14 
 15 @property (nonatomic, strong) Reachability *reachability;
 16 
 17 @end
 18 
 19 @implementation ViewController
 20 /*
 21  检测网络状态
 22  1.在网络应用中，需要对用户设备的网络状态进行实时监控，目的：
 23    a.让用户了解自己的网络状态，防止一些误会（怪应用无能）
 24    b.根据用户的网络状态进行智能处理，节省用户流量，提高用户体验
 25      WIFI/3G/4G网络：自动下载高清图片
 26             低速网络：只能下载缩略图
 27             没有网络：智能显示离线的缓存数据
 28    c.苹果官方提供了一个叫Reachability的示例程序，便于开发者检测网络状态
 29      https://developer.apple.com/library/ios/samplecode/Reachability/Reachability.zip
 30  
 31  2.Reachability的使用步骤
 32  1>添加框架SystemConfiguration.framework
 33  2>添加源代码
 34  3>包含头文件 - #import "Reachability.h"
 35  
 36  3.常见用法
 37  1>是否是WiFi
 38  + (BOOL)isEnableWiFi
 39  {
 40  return [[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] !=NotReachable;
 41  }
 42  2>是否是3G
 43  + (BOOL)isEnable3G
 44  {
 45  return [[Reachability reachabilityForInternetConnection] currentReachabilityStatus] !=NotReachable;
 46  }
 47  */
 48 
 49 - (void)viewDidLoad {
 50     [super viewDidLoad];
 51     
 52     //监听网络状态发生改变通知
 53     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];
 54     
 55     //获得Reachability对象
 56     self.reachability = [Reachability reachabilityForInternetConnection];
 57     
 58     //开始监控
 59     [self.reachability startNotifier];
 60     
 61 //    //获取Reachability对象
 62 //    Reachability *wifi = [Reachability reachabilityForLocalWiFi];
 63 //    //获取Reachability对象的当前网络状态
 64 //    NetworkStatus wifiStatus = wifi.currentReachabilityStatus;
 65 //    
 66 //    if (wifiStatus !=NotReachable) {
 67 //        NSLog(@"wifi");
 68 //    }
 69     
 70 }
 71 
 72 - (void)networkStateChange
 73 {
 74     NSLog(@"网络状态改变了");
 75     [self changeNetworkState];
 76 }
 77 
 78 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 79 {
 80     [self changeNetworkState];
 81 }
 82 
 83 - (void)changeNetworkState
 84 {
 85     if ([BWNetWorkTool isEnableWiFi]) {
 86         NSLog(@"WiFi环境");
 87     }else if ([BWNetWorkTool isEnable3G]){
 88         NSLog(@"手机自带网络");
 89     }else{
 90         NSLog(@"没有网络");
 91     }
 92 }
 93 
 94 - (void)dealloc
 95 {
 96     [self.reachability stopNotifier];
 97     [[NSNotificationCenter defaultCenter] removeObserver:self];
 98 }
 99 
100 @end