检测iphone是否有网络

最新推荐文章于 2025-10-10 15:42:06 发布

转载最新推荐文章于 2025-10-10 15:42:06 发布 · 975 阅读

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#iphone #struct #network #null #网络

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本文提供了一个Objective-C方法来检查设备是否连接到互联网。通过创建一个零地址结构并使用SCNetworkReachability API来获取网络可达性标志，进而判断当前网络状态。

调用此方法可以进行判断，不要忘记了头文件 #import <netinet/in.h>
-(BOOL)connectedToNetwork{
    // Create zero addy
    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;

    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);

    if (!didRetrieveFlags)
    {
        NSLog(@"Error. Could not recover network reachability flags");
        return NO;
    }

    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    return (isReachable && !needsConnection) ? YES : NO;
}