当在Alamofire中遇到证书问题时，可以使用以下方法解决：

1. 禁用证书验证：

let manager = Session.default
manager.session.configuration.timeoutIntervalForResource = 30 // 设置请求超时时间

let serverTrustPolicies: [String: ServerTrustEvaluating] = [
    "your-server-url": DisabledTrustEvaluator()
]

let configuration = URLSessionConfiguration.af.default
configuration.timeoutIntervalForRequest = 30 // 设置请求超时时间
configuration.timeoutIntervalForResource = 30 // 设置请求超时时间
configuration.httpAdditionalHeaders = SessionManager.defaultHTTPHeaders

let sessionDelegate = SessionDelegate()

let session = Session(
    configuration: configuration,
    delegate: sessionDelegate,
    serverTrustManager: ServerTrustManager(evaluators: serverTrustPolicies)
)

AF.request("your-server-url", session: session).response { response in
    // 处理响应结果
}

2. 自定义证书验证：

let manager = Session.default
manager.session.configuration.timeoutIntervalForResource = 30 // 设置请求超时时间

let serverTrustPolicies: [String: ServerTrustEvaluating] = [
    "your-server-url": PinnedCertificatesTrustEvaluator(certificates: ServerTrustPolicy.certificates(), validateCertificateChain: true, validateHost: true)
]

let configuration = URLSessionConfiguration.af.default
configuration.timeoutIntervalForRequest = 30 // 设置请求超时时间
configuration.timeoutIntervalForResource = 30 // 设置请求超时时间
configuration.httpAdditionalHeaders = SessionManager.defaultHTTPHeaders

let sessionDelegate = SessionDelegate()

let session = Session(
    configuration: configuration,
    delegate: sessionDelegate,
    serverTrustManager: ServerTrustManager(evaluators: serverTrustPolicies)
)

AF.request("your-server-url", session: session).response { response in
    // 处理响应结果
}

请将 "your-server-url" 替换为实际的服务器URL。以上代码示例中，我们分别禁用了证书验证和自定义证书验证来处理证书问题。你可以根据实际情况选择其中一种方法来解决你的问题。