ios - 如何以编程方式在 swift 3 中添加第二个 View

Question

我试图从第一个 View 上的按钮切换到第二个 View ，并以编程方式执行此操作(不使用在 Storyboard上使用 segue 在 View 之间切换的传统方式)

我当前的应用委托(delegate):

import UIKit

@UIApplicationMain
public class AppDelegate: UIResponder, UIApplicationDelegate {

    public var window: UIWindow?

    public func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        window = UIWindow(frame: UIScreen.main.bounds)
        window?.makeKeyAndVisible()
        window?.rootViewController = UINavigationController(rootViewController: ViewController())

        return true
    }

第一个 View Controller 中的按钮功能，按下时应该只切换到新 View :

func signupAction (sender: UIButton!){

}

我已经创建了新的 View Controller 文件:

class Signup: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = UIColor.cyan
    }
}

基本上，我正在尝试实现第一个 View Controller 中的按钮过渡到这个注册 View Controller 。

Answer 1

如果您在 UINavigationController 中，您可以通过以下方式将 Signup View Controller 推送到导航堆栈:

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let signUpViewController = storyboard.instantiateViewController(withIdentifier: "signUpViewController") as! Signup
navigationController?.pushViewController(signUpViewController, animated: true)

如果你不在UINavigationController中并且想呈现它，你可以这样做:

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let signUpViewController = storyboard.instantiateViewController(withIdentifier: "signUpViewController") as! Signup
self.present(signUpViewController, animated: true, completion: nil)

注意:不要忘记在 Storyboard中设置 View Controller 的标识符。