ios - 网络检测

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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

https://developer.apple.com/library/ios/samplecode/Reachability/Reachability.zip

一、监测网络状态

Reachability的使用步骤

添加框架SystemConfiguration.framework

添加源代码

包含头文件

#import "Reachability.h"

代码示例：

 1 #import "YYViewController.h"
 2 #import "Reachability.h"
 3 
 4 @interface YYViewController ()
 5 @property (nonatomic, strong) Reachability *conn;
 6 @end
 7 
 8 @implementation YYViewController
 9 
10 - (void)viewDidLoad
11 {
12     [super viewDidLoad];
13     
14     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];
15     self.conn = [Reachability reachabilityForInternetConnection];
16     [self.conn startNotifier];
17 }
18 
19 - (void)dealloc
20 {
21     [self.conn stopNotifier];
22     [[NSNotificationCenter defaultCenter] removeObserver:self];
23 }
24 
25 - (void)networkStateChange
26 {
27     [self checkNetworkState];
28 }
29 
30 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
31 {
32 
33 }
34 
35 - (void)checkNetworkState
36 {
37     // 1.检测wifi状态
38     Reachability *wifi = [Reachability reachabilityForLocalWiFi];
39     
40     // 2.检测手机是否能上网络(WIFI\3G\2.5G)
41     Reachability *conn = [Reachability reachabilityForInternetConnection];
42     
43     // 3.判断网络状态
44     if ([wifi currentReachabilityStatus] != NotReachable) { // 有wifi
45         NSLog(@"有wifi");
46         
47     } else if ([conn currentReachabilityStatus] != NotReachable) { // 没有使用wifi, 使用手机自带网络进行上网
48         NSLog(@"使用手机自带网络进行上网");
49         
50     } else { // 没有网络
51         
52         NSLog(@"没有网络");
53     }
54 }
55 @end
56 
57 // 用WIFI
58 // [wifi currentReachabilityStatus] != NotReachable
59 // [conn currentReachabilityStatus] != NotReachable
60 
61 // 没有用WIFI, 只用了手机网络
62 // [wifi currentReachabilityStatus] == NotReachable
63 // [conn currentReachabilityStatus] != NotReachable
64 
65 // 没有网络
66 // [wifi currentReachabilityStatus] == NotReachable
67 // [conn currentReachabilityStatus] == NotReachable

ios - 网络检测

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原文地址：http://www.cnblogs.com/jianghong/p/4818718.html