把凭据直接存储在Swift文件中并不是最安全的方式。可以使用Keychain或类似的安全存储库来安全地存储凭据。

下面是一个使用Keychain的示例：

import Foundation
import Security

class KeychainService {

    class func savePassword(_ password: String, forAccount account: String) {
        guard let passwordData = password.data(using: String.Encoding.utf8) else { return }
        
        let query = [
            kSecClass as String       : kSecClassInternetPassword,
            kSecAttrAccount as String : account,
            kSecValueData as String   : passwordData ] as [String : Any]
        
        SecItemDelete(query as CFDictionary)
        SecItemAdd(query as CFDictionary, nil)
    }
    
    class func getPassword(forAccount account: String) -> String? {
        let query = [
            kSecClass as String       : kSecClassInternetPassword,
            kSecAttrAccount as String : account,
            kSecReturnData as String  : true ] as [String : Any]
        
        var dataTypeRef: AnyObject?
        
        let status = SecItemCopyMatching(query as CFDictionary, &dataTypeRef)
        
        if status == errSecSuccess {
            if let retrievedData = dataTypeRef as? Data,
                let password = String(data: retrievedData, encoding: String.Encoding.utf8) {
                return password
            }
        }
        
        return nil
    }
    
}

使用示例：

let username = "exampleUser"
let password = "password123"

// Save password
KeychainService.savePassword(password, forAccount: username)

// Retrieve password
if let savedPassword = KeychainService.getPassword(forAccount: username) {
    print("Saved password: \(savedPassword)")
} else {
    print("No password saved for \(username)")
}