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如何管理彼此打开和重新打开的UIViewControllers

uiviewcontroller swift3 ios

0

willow · 技术社区 · 7 年前

我有两个UIViewControllers,它们互相打开,我的问题在它发生几次时就开始了,所以当用户点击close按钮时,这些viewcontrollers有很多实例,

我不使用Segue,使用下面的代码

 let vc = self.storyboard?.instantiateViewController(withIdentifier: "verifySMSView") as! SMSVerificationViewController
            vc.delegate = self
            self.present(vc, animated: true, completion: nil)

LINK )

如何管理viewcotroller和停止重新打开, 任何帮助都将不胜感激

2 回复 | 直到 7 年前

1

0

iOS Lifee 7 年前

写这个代码

self.dismiss(animated: true, completion: nil)

点击“我已经有账户”按钮事件

2

0

André Slotta 7 年前

我创建了一个简单的演示应用程序(没有故事板,只有代码),一切都按预期工作。将以下内容与您的代码进行比较:

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow()
        window?.rootViewController = ViewControllerA()
        window?.makeKeyAndVisible()
        return true
    }

}

class ViewControllerA: UIViewController {

    let createNewAccountButton: UIButton = {
        let button = UIButton(type: .system)
        button.translatesAutoresizingMaskIntoConstraints = false

        button.setTitle("Create new account", for: .normal)
        button.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)

        return button
    }()

    @objc func buttonTapped(_ sender: UIButton) {
        let viewControllerB = ViewControllerB()
        present(viewControllerB, animated: true, completion: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .lightGray

        view.addSubview(createNewAccountButton)

        NSLayoutConstraint.activate([
            createNewAccountButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            createNewAccountButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -20)
        ])
    }
}

class ViewControllerB: UIViewController {

    let alreadyHaveAnAccountButton: UIButton = {
        let button = UIButton(type: .system)
        button.translatesAutoresizingMaskIntoConstraints = false

        button.setTitle("I already have an account", for: .normal)
        button.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)

        return button
    }()

    @objc func buttonTapped(_ sender: UIButton) {
        dismiss(animated: true, completion: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .darkGray

        view.addSubview(alreadyHaveAnAccountButton)

        NSLayoutConstraint.activate([
            alreadyHaveAnAccountButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            alreadyHaveAnAccountButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -20)
        ])
    }
}