标签：io ar os 使用 sp for 文件 on div
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.
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//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"; }} |
标签：io ar os 使用 sp for 文件 on div
原文地址：http://www.cnblogs.com/z-j-w/p/4112365.html
