步骤1：

将“SystemConfiguration”框架添加到项目中

第2步：

将此功能添加到您的项目：

func isConnectionAvailble()->Bool{
 
    var rechability = SCNetworkReachabilityCreateWithName(kcfAllocatorDefault,"www.apple.com").takeRetainedValue()
 
    var flags : SCNetworkReachabilityFlags = 0
 
    if SCNetworkReachabilityGetFlags(rechability,&flags) == 0
    {
        return false
    }
 
    let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0
    let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionrequired)) != 0
    return (isReachable && !needsConnection)
}