ios - 如何在代码中打开 View Controller

Question

如何在某些操作后转到 View Controller ，如下所示:

func requestForAccessToken(authorizationCode: String) {

        Alamofire.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default, headers: nil)
            .responseJSON { response in

            switch response.result {
            case .success(let JSON):
                let response = JSON as! NSDictionary
                let accessToken = response.object(forKey: "access_token")!
                UserDefaults.standard.set(accessToken, forKey: "LIAccessToken")
                UserDefaults.standard.synchronize()
                ///here...
                DispatchQueue.main.async(execute: { () -> Void in
//                    self.dismiss(animated: true, completion: nil)
                    let secondViewController: LoginViewController = LoginViewController()
                    self.present(secondViewController, animated: true, completion: nil)
                })
            case .failure(let error):
                print("Request failed with error: \(error)")

            }
        }

    }

我在 Storyboard中创建 vc 并制作 vc 类文件。也许我必须做点别的。

Answer 1

如果您在storyboard 中创建一个viewController，那么您必须使用storyboard 实例化它。试试这个:

DispatchQueue.main.async(execute: { () -> Void in
    let secondViewController = UIStoryboard(name:"LoginViewController", bundle: nil.instantiateViewControllerWithIdentifier("LoginV‌​iewController") as? LoginViewController
    self.present(secondViewController, animated: true, completion: nil)
})

希望您已将 Storyboard命名为 LoginViewController 并提供 storyboardID 作为 LoginViewController