Question

尝试在我的应用中检查互联网连接时出现此错误。

我使用Xcode 7.1.1 Swift 2.0

代码块如下

public class Reach {

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(sizeofValue(zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
        SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))//.takeRetainedValue()
    })

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

    //The following two lines shows the error
    let isReachable = (flags  & (kSCNetworkFlagsReachable)) != 0
    let needsConnection = (flags  & (kSCNetworkFlagsConnectionRequired)) != 0

    return isReachable && !needsConnection
}

}

我尝试将标志转换为Int，将NetworkFlag转换为UInt32，反之亦然，但它仍显示警告并在执行时出错。我尝试了以下

(flags  & UInt32(kSCNetworkFlagsReachable))
(Int(flags)  & (kSCNetworkFlagsReachable))
(flags  & (kSCNetworkFlagsReachable) as! UInt32)
(flags as! Int  & (kSCNetworkFlagsReachable))

但没有任何效果。任何人都可以解决它

SCNetworkReachabilityFlags的内容

public struct SCNetworkReachabilityFlags : OptionSetType {
public init(rawValue: UInt32)

public static var TransientConnection: SCNetworkReachabilityFlags { get }
public static var Reachable: SCNetworkReachabilityFlags { get }
public static var ConnectionRequired: SCNetworkReachabilityFlags { get }
public static var ConnectionOnTraffic: SCNetworkReachabilityFlags { get }
public static var InterventionRequired: SCNetworkReachabilityFlags { get }
public static var ConnectionOnDemand: SCNetworkReachabilityFlags { get } // __OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_3_0)
public static var IsLocalAddress: SCNetworkReachabilityFlags { get }
public static var IsDirect: SCNetworkReachabilityFlags { get }

public static var IsWWAN: SCNetworkReachabilityFlags { get }
// TARGET_OS_IPHONE

public static var ConnectionAutomatic: SCNetworkReachabilityFlags { get }

}

Answer 1

试试吧

let isReachable = flags.contains(SCNetworkReachabilityFlags.Reachable)
let needsConnection = flags.contains(SCNetworkReachabilityFlags.ConnectionRequired)

OptionSetType有一个包含的便捷方法，所以希望能检查是否设置了标志

二元运算符＆＃39;＆amp;＆＃39;不能应用于类型＆＃39; SCNetworkReachabilityFlags＆＃39;的操作数。和＆＃39; Int＆＃39;

1 个答案: