如评论中所述，尽管可以在Swift中使用Objective-C库，但我想要一个更纯粹的Swift解决方案。现有的AppleReachability类和其他第三方库对于我来说转换为Swift似乎太复杂了。我用Google搜索了更多内容，然后发现本文显示了一种检查网络可用性的简单方法。我着手将其翻译为Swift。我遇到了很多麻烦，但是由于来自的MartinR，我设法解决了这些麻烦，并最终在Swift中获得了可行的解决方案。这是代码。
import Foundationimport SystemConfigurationpublic 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(sizeofValue(zeroAddress)) zeroAddress.sin_family = sa_family_t(AF_INET) let defaultRouteReachability = withUnsafePointer(&zeroAddress) { SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue() } var flags: SCNetworkReachabilityFlags = 0 if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 { return false } let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0 let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequired)) != 0 return isReachable && !needsConnection }}对于Swift > 3.0
public class Reachability { public func isConnectedToNetwork() -> Bool { var zeroAddress = sockaddr_in() zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size) zeroAddress.sin_family = sa_family_t(AF_INET) guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, { $0.withMemoryRebound(to: sockaddr.self, capacity: 1) { SCNetworkReachabilityCreateWithAddress(nil, $0) } }) else { return false } var flags: SCNetworkReachabilityFlags = [] if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) { return false } if flags.isEmpty { return false } let isReachable = flags.contains(.reachable) let needsConnection = flags.contains(.connectionRequired) return (isReachable && !needsConnection) }}这适用于3G和WiFi连接。我还通过一个工作示例将其上传到了我的GitHub。
