ios - 检查互联网连接 queryForTable Parse

Question

我试图在应用程序启动时检查互联网是否已连接。当我关闭 Wifi 并检查应用程序的工作情况时，该应用程序仍在尝试连接到互联网 10 秒钟。如果用户未连接到互联网，那么我应该显示一条警告，请连接到互联网。

我没有使用localDataStore。在我看来，我必须在 queryForTable 中添加互联网检查语句。

func baseQuery() -> PFQuery {
    let query = PFQuery(className: "homeClass") // Replace with the class name for the Parse data you're interested in.
     // Just like with a regular PFQuery you can filter and sort.
    query.orderByAscending("SNo")
    return query
} 


override func queryForTable() -> PFQuery {
    if Reachability.isConnectedToNetwork() == true {
        print("Internet connection OK")
        tableView.reloadData()
        self.baseQuery()
    } else {
        print("Internet connection FAILED")
        let alert = UIAlertView(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", delegate: nil, cancelButtonTitle: "OK")
        alert.show()
        let destinationVC:MainViewController = self.storyboard?.instantiateViewControllerWithIdentifier("NewView") as! MainViewController
        navigationController?.pushViewController(destinationVC , animated: true)

    }

}

更新

func baseQuery() -> PFQuery {

    let query = PFQuery(className: "homeClass")

    if Reachability.isConnectedToNetwork() != true {
       print("Internet connection FAILED")

            } else {
            print("Internet connection OK")
            query.orderByAscending("SNo")
            return query
        }

        return PFQuery()
    }

  override func queryForTable() -> PFQuery {

    return self.baseQuery()
}

我正在尝试此代码，但它仍然尝试从互联网获取数据。

Answer 1

我刚刚在 SO 这个程序上找到了这个来检查接口(interface) IP 地址，您需要添加一个桥接 header 才能使其工作。

虽然也许不是“答案”；您应该能够修改此代码来检查所有网络连接的状态。

请注意，您需要通过 Objective-C 桥接 header 包含此内容。

#include <ifaddrs.h>

您应该能够从这里将其组合在一起!

func getIFAddresses() -> [String] {
var addresses = [String]()

// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
if getifaddrs(&ifaddr) == 0 {

// For each interface ...
for (var ptr = ifaddr; ptr != nil; ptr = ptr.memory.ifa_next) {
    let flags = Int32(ptr.memory.ifa_flags)
    var addr = ptr.memory.ifa_addr.memory

    // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
    if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
        if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {

            // Convert interface address to a human readable string:
            var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
            if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
                nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                    if let address = String.fromCString(hostname) {
                        addresses.append(address)
                    }
            }
        }
    }
}
freeifaddrs(ifaddr)
}

 return addresses
}