首页 > 代码库 > 判断网络

判断网络

网络分wifi、3G、2G、无网络连接;

第一种方案:逻辑如下:
1、先判断当前有无网络;
2、有网络的情况下:
(1)、网络为wifi;
(2)、网络为3G;
(3)、网络为2G;

使用reachability里的KShouldPrintReachabilityFlags 就可以详细区分出wifi、3G、2G,重构一下就可以了;
网速 wifi>3G>2G

PS:当然还有一种情况就是网络连接不稳定,wifi、3G的网速有可能比2G慢.

第二种方案:
在服务器设置一个文件,在客户端下载,计算下载时间,不过几K的文件下载时间基本没啥区别,弄几M的文件下载,时间区别很大,但是用户的流量就被浪费了,所以不可取.

 

 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
//Reachability.m 中 networkStatusForFlags 方法重构
- (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags
{
    if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
    {
        return NotReachable;
    }
     
    BOOL retVal = NotReachable;
     
    if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
    {
        // if target host is reachable and no connection is required
        //  then we‘ll assume (for now) that your on Wi-Fi
        retVal = ReachableViaWiFi;
    }
     
     
    if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
         (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
    {
        // ... and the connection is on-demand (or on-traffic) if the
        //     calling application is using the CFSocketStream or higher APIs
        if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
        {
            // ... and no [user] intervention is needed
            retVal = ReachableViaWiFi;
        }
    }
     
    if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
    {
        if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable) {
            if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection) {
                retVal = ReachableVia3G;
                if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired) {
                    retVal = ReachableVia2G;
                }
            }
        }
    }
    return retVal;
}
 
//检查当前网络连接是否正常
-(BOOL)connectedToNetWork
{
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;
     
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
     
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
     
    if (!didRetrieveFlags) {
        printf("Error. Count not recover network reachability flags\n");
        return NO;
    }
     
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    return (isReachable && !needsConnection) ? YES : NO;
}
 
//检查网络连接类型
-(void)checkNetworktype:(id)sender{
    NSString *connectionKind;
    if ([self connectedToNetWork]) {
        hostReach = [Reachability reachabilityWithHostName:@"www.google.com"];
        switch ([hostReach currentReachabilityStatus]) {
            case NotReachable:
                connectionKind = @"没有网络链接";
                break;
            case ReachableViaWiFi:
                connectionKind = @"当前使用的网络类型是WIFI";
                break;
            case ReachableVia3G:
                connectionKind = @"当前使用的网络链接类型是WWAN(3G)";
                break;
            case ReachableVia2G:
                connectionKind = @"当前使用的网络链接类型是WWAN(2G)";
                break;    
            default:
                break;
        }
    }else {
        connectionKind = @"没有网络链接";
    }
}

判断网络