Question

我正在使用可达性，但其显示设备通过wifi或蜂窝数据连接。我只想知道设备是否连接到互联网。我只是使用了一些代码，它可以正常工作，但是如果设备未连接到互联网，则应用程序将变得免费。

struct hostent*hostinfo;
char*hostname="google.com";
hostinfo=gethostbyname(hostname);
if (hostinfo == NULL){
NSLog(@"-> no connection!\n");
}

Answer 1

仅 Swift

您需要导入SystemConfiguration.CaptiveNetwork，波纹管方法对我来说就像是魅力

public class func isInternetAvailable() -> Bool {
    var zeroAddress        = sockaddr_in()
    zeroAddress.sin_len    = UInt8(MemoryLayout<sockaddr_in>.size)
    zeroAddress.sin_family = sa_family_t(AF_INET)

    guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {
        $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
            SCNetworkReachabilityCreateWithAddress(nil, $0)
        }
    }) else {
        return false
    }

    var flags: SCNetworkReachabilityFlags = []
    if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
        return false
    }

    let isReachable = flags.contains(.reachable)
    let needsConnection = flags.contains(.connectionRequired)

    return (isReachable && !needsConnection)
}

Answer 2

使用NSURL检查互联网连接

NSURL *url = [NSURL URLWithString:@"https://www.google.com/"];
if ([NSData dataWithContentsOfURL:url]) {
    NSLog(@"Device is connected to the Internet");
} else {
    NSLog(@"Device is not connected to the Internet");
}

检查活动的互联网是否可用

2 个答案: