Question

我正在构建一个始终需要蜂窝数据（3G / 4G）的应用程序。

当我的应用加载时，它会检查互联网连接是否可用。如果＆＃39; True＆＃39;它将从Firebase中提取所有数据，否则它将显示警报并通过Timer重新检查连接。请参阅以下代码以检查互联网连接...

import Foundation
import SystemConfiguration

public class Reachability {

class func isConnectedToNetwork() -> Bool {

    var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
    zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
        $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
            SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
        }
    }

    var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
    if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
        return false
    }

    let isReachable = flags == .reachable
    let needsConnection = flags == .connectionRequired

    return isReachable && !needsConnection
    }
}

我没有详细了解上面的代码。我认为它只适用于wifi。如果关闭wifi并打开3G，它就不会检测到连接。有人可以帮助检查细胞数据吗？

检查蜂窝数据连接（3G / 4G）

0 个答案: