iPhone模拟器无法连接互联网

为什么iPhone模拟器无法连接互联网？

swift
import Foundation
import SystemConfiguration
func isInternetAvailable() -> Bool {
    var zeroAddress = sockaddr_in()
    zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
    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
    }
    
    let isReachable = flags.contains(.reachable)
    let needsConnection = flags.contains(.connectionRequired)
    
    return (isReachable && !needsConnection)
}
if isInternetAvailable() {
    print("iPhone模拟器可以连接互联网")
} else {
    print("iPhone模拟器无法连接互联网")
}