iPhone上是否存在hosts文件如何改变呢 [关闭]

iPhone上的hosts文件及修改方法

swift
import NetworkExtension
func modifyDNS(server: String, ipAddress: String) {
    let config = NEDNSSettings()
    config.servers = [ipAddress]
    config.matchDomains = [server]
    
    let manager = NEDNSProxyManager.shared()
    manager.loadFromPreferences { (error) in
        if error == nil {
            manager.providerProtocol = config
            manager.saveToPreferences(completionHandler: { (error) in
                if error == nil {
                    print("DNS settings modified successfully.")
                } else {
                    print("Failed to modify DNS settings: \(error?.localizedDescription ?? "")")
                }
            })
        } else {
            print("Failed to load DNS settings: \(error?.localizedDescription ?? "")")
        }
    }
}