如果在进行API请求时出现了钥匙串访问的警报，可以在代码中添加以下代码来解决这个问题：

import Foundation
import Security

let access = SecAccessControlCreateWithFlags(nil,
                                                   kSecAttrAccessibleWhenUnlocked,
                                                   [.privateKeyUsage,.biometryAny,.or],
                                                   nil)

let query = [
            kSecClass as String: kSecClassInternetPassword,
            kSecAttrServer as String: serverURL,
            kSecAttrAccount as String: account,
            kSecUseAuthenticationUI as String: kSecUseAuthenticationUISkip,
            kSecReturnData as String: true,
            kSecAttrAccessControl as String: access!
            ] as [String: Any]

var result: AnyObject?
let status = SecItemCopyMatching(query as CFDictionary, &result)

这段代码的作用是，创建了一个属性控制列表，用于对API请求进行权限控制，确保API请求时不会触发钥匙串访问的警报。同时，还利用了SecItemCopyMatching函数，自动将API请求的服务器URL和帐户名保存到钥匙串中，并在下一次请求之前自动验证身份。这样，即可避免了API请求时因钥匙串访问问题而造成的阻塞。