swift – 合并视图而不是单独显示它们

import SafariServices


class SafariExtensionViewController: SFSafariExtensionViewController {


    @IBOutlet weak var passwordMessage: NSTextField!
    @IBOutlet weak var emailMessage: NSTextField!
    @IBOutlet weak var message: NSTextField!
    @IBOutlet weak var email: NSTextField!
    @IBOutlet weak var password: NSSecureTextField!
    static let shared = SafariExtensionViewController()
    override func viewDidLoad() {
        self.preferredContentSize = NSSize(width: 300,height: 250)
        message.stringValue = ""
        emailMessage.stringValue = ""
        passwordMessage.stringValue = ""
    }
    override func viewDidAppear() {
        if let storedEmail = UserDefaults.standard.object(forKey: "email") as? String {
            if let stepView = Bundle.mainBundle.loadNibNamed(NSNib.Name(rawValue: "ExtensionStepsViewController"),owner: nil,topLevelObjects: nil)[0] {
                self.view.addSubview(stepView)
            }
        }
    }

    @IBAction func userLogin(_ sender: Any) {
        let providedEmailAddress = email.stringValue
        let providedPassword = password.stringValue
        let isEmailAddressValid = isValidEmailAddress(emailAddressString: providedEmailAddress)
        self.message.stringValue = ""
        emailMessage.stringValue = ""
        passwordMessage.stringValue = ""
        if isEmailAddressValid && providedPassword.count > 0 {
          /* login process is handled here and store the email in local storage /*
          /* TODO for now email is not stored in browser localstorage which has to be fixed */
         let controller = "ExtensionStepsViewController"
         let subview = ExtensionStepsViewController(nibName: NSNib.Name(rawValue: controller),bundle: nil)
         self.view.addSubview(subview.view)
         }   
}
}

let controller = "ExtensionStepsViewController"
let subview = ExtensionStepsViewController(nibName: NSNib.Name(rawValue: controller),bundle: nil)
self.view.addSubview(subview.view)

你得到错误“类型Bool没有下标成员”,因为 Bundle的 loadNibNamed(_:owner:topLevelObjects:)方法返回没有 subscript成员的 Bool结构所以你不能写

true[0]

如何正确使用此方法请参见link和示例：

var topLevelObjects : NSArray?
if Bundle.main.loadNibNamed(NSNib.Name(rawValue: "ExtensionStepsViewController"),owner: self,topLevelObjects: &topLevelObjects) {
     let  topLevelObjects!.first(where: { $0 is NSView }) as? NSView
}

视图已合并,因为您没有从superview中删除先前的视图,并将ExtensionStepsViewController中的视图添加到同一个superview.

您可以执行以下步骤来完成您的问题：

>使SafariExtensionViewController继承自SFSafariExtensionViewController,它将是两个子视图控制器(如LoginViewController和ExtensionStepsViewController)的容器(和父),并将用于在它们之间导航.
>单独制作LoginViewController和ExtensionStepsViewController(均继承自简单的NSViewController)及其xib.
>用户从LoginViewController到ExtensionStepsViewController登录transit之后

作为示例,但是您必须使用您的实现SafariExtensionViewController而不是ParentViewController,如上所述.

public protocol LoginViewControllerDelegate: class {
    func loginViewControllerDidLoginSuccessful(_ loginVC: LoginViewController)
}

public class LoginViewController: NSViewController {
    weak var delegate: LoginViewControllerDelegate?

    @IBAction func login(_ sender: Any) {
        // login logic
        let isLoginSuccessful = true
        if isLoginSuccessful {
            self.delegate?.loginViewControllerDidLoginSuccessful(self)
        }
    }
}

public class ExtensionStepsViewController: NSViewController {

}

public class ParentViewController: NSViewController,LoginViewControllerDelegate {
    weak var login: LoginViewController! // using of force unwrap is anti-pattern. consider other solutions
    weak var steps: ExtensionStepsViewController!

    public override func viewDidLoad() {
        let login = LoginViewController(nibName: NSNib.Name(rawValue: "LoginViewController"),bundle: nil)
        login.delegate = self
        // change login view frame if needed
        login.view.frame = self.view.frame
        self.view.addSubview(login.view)
        // instead of setting login view frame you can add appropriate layout constraints
        self.addChildViewController(login)
        self.login = login

        let steps = ExtensionStepsViewController(nibName: NSNib.Name(rawValue: "ExtensionStepsViewController"),bundle: nil)
        steps.view.frame = self.view.frame
        self.addChildViewController(steps)
        self.steps = steps
    }

    // MARK: - LoginViewControllerDelegate

    public func loginViewControllerDidLoginSuccessful(_ loginVC: LoginViewController) {
        self.transition(from: self.login,to: self.steps,options: .slideLeft) {
            // completion handler logic
            print("transition is done successfully")
        }
    }
}

Here是这个例子的快捷游乐场.

UPD：

您可以通过以下几种方式实例化NSViewController：

>使用允许从.storyboard文件加载NSViewController视图的NSStoryboard：

let storyboard = NSStoryboard(name: NSStoryboard.Name("NameOfStoryboard"),bundle: nil)
let viewController = storyboard.instantiateController(withIdentifier: NSStoryboard.SceneIdentifier("NSViewControllerIdentifierInStoryboard"))

>使用NSViewController的相应initialiser从.xib文件加载它的视图：

let steps = ExtensionStepsViewController(nibName: NSNib.Name(rawValue: "ExtensionStepsViewController"),bundle: nil)

>使用默认初始化程序,但如果xib文件的名称与视图控制器类的名称不同,则必须通过重写loadView()方法直接加载视图：

let steps = ExtensionStepsViewController()
// Also you have to override loadView() method of ExtensionStepsViewController.