iOS中的蜂窝网络的可达性返回False - Swift

Question

我有这个代码用于检查互联网连接，它工作得非常好，直到我更新到Xcode 8和swift 3。 现在它对于蜂窝网络返回false，对于WiFi网络则为真，我不知道为什么。

这是代码：

open 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

  }
}

现在如何让这个函数为wifi和蜂窝连接返回true？

Answer 1

这是Apple的Reachability框架的快速实现。 考虑使用它，这可能会解决您的问题。 可达性

检查用户是否已连接到互联网

let reachability = Reachability()
if reachability.isReachable{
//Network is reachable
}else{
//Not reachable 
}

它还具有whenReachable，whenUnreachable闭包和ReachabilityChangedNotification通知，您可以使用它来检查互联网连接何时可用以及何时不可用，以便您可以相应地处理这些事件

Answer 2

我正在使用以下代码，它的工作正常。

对于Swift3

import Foundation
import SystemConfiguration

public class Reachability {

    class func isConnectedToNetwork() -> Bool {

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

        let isReachable = flags.contains(.reachable)
        let needsConnection = flags.contains(.connectionRequired)
        return (isReachable && !needsConnection)
    }

}

被称为：

if Reachability.isConnectedToNetwork() == true {
    xy
} else {
    yz
}

Swift 2（进一步观众）

import Foundation
import SystemConfiguration

public class Reachability {

    class func isConnectedToNetwork() -> Bool {

        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)

        guard let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($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)
    }
}

与Swift 3中的调用相同。