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导入头文件
- #include <netinet/in.h>
- #import <SystemConfiguration/SCNetworkReachability.h>
判断网络连接状态
- //判断当前网络连接状态
- -(BOOL)isNetworkAvailable
- {
- //创建零地址，0.0.0.0的地址表示查询本机的网络连接状态
- struct sockaddr_in zeroAddress;
- bzero(&zeroAddress, sizeof(zeroAddress));
- zeroAddress.sin_len = sizeof(zeroAddress);
- zeroAddress.sin_family = AF_INET;
- // Recover reachability flags
- SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
- SCNetworkReachabilityFlags flags;
- //获得连接的标志
- BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
- CFRelease(defaultRouteReachability);
- //如果不能获取连接标志，则不能连接网络，直接返回
- if (!didRetrieveFlags)
- {
- return NO;
- }
- //根据获得的连接标志进行判断
- BOOL isReachable = flags & kSCNetworkFlagsReachable;
- BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
- return (isReachable && !needsConnection) ? YES : NO;
- }
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