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 @interfaceBWNetWorkTool : 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 @implementationBWNetWorkTool
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 @interfaceViewController ()
14 
15 @property (nonatomic, strong) Reachability *reachability;
16 
17 @end
18 
19 @implementationViewController
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