ios - 如何在 Swift 中封装 UIViewController(如 UIAlertController)？

Question

我的 Storyboard 中有一个 ViewController，它的工作方式类似于警报(带有标题、消息和两个按钮)。

我想封装它以便能够在我的代码中的任何地方使用它，就像这样:

let alert = CustomAlertViewController(title: "Test", message: "message de test.", view: self.view, delegate: self)
self.present(alert, animated: false, completion: nil)

我的问题是 IBOutlets 没有初始化...

我的 CustomAlertViewController:

public protocol CustomAlertProtocol {
    func alertAccepted()
}

class CustomAlertViewController: UIViewController {

    var delegate :CustomAlertProtocol? = nil
    var parentView :UIView?
    var blurScreenshot :SABlurImageView?

    var alertTitle :String? = nil
    var alertMessage :String? = nil

    @IBOutlet weak var oAlertView: UIView!
    @IBOutlet weak var oAlertTitle: UILabel!
    @IBOutlet weak var oAlertMessage: UILabel!


    //MARK: - Main

    public convenience init(title: String?, message: String?, view: UIView, delegate: CustomAlertProtocol) {
        self.init()
        self.alertTitle = title
        self.alertMessage = message
        self.delegate = delegate
        self.parentView = view
    }

    override func viewDidLoad() {
        oAlertTitle.text = self.alertTitle
        oAlertMessage.text = self.alertMessage
    }

    @IBAction func onAcceptButtonPressed(_ sender: AnyObject) {
        delegate?.alertAccepted()
    }
}

Answer 1

将 View Controller 的 Custom Class 属性设置为 CustomAlertViewController
和 Storyboard ID 到你想要的任何东西 - 例如InterfaceBuilder 的身份检查器中的 CustomAlertViewControllerIdentifier。

然后像下面这样实例化它:

let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())

guard let vc = storyboard.instantiateViewControllerWithIdentifier("CustomAlertViewControllerIdentifier") as? CustomAlertViewController else {
    return
}

编辑:

然后您可以将该代码放入类函数中，例如:

extension CustomAlertViewController {
    class func instantiateFromStoryboard(title: String?, message: String?, view: UIView, delegate: CustomAlertProtocol) -> CustomAlertViewController {
        let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
        let vc = storyboard.instantiateViewControllerWithIdentifier("CustomAlertViewControllerIdentifier") as! CustomAlertViewController

        vc.title = title
        vc.message = message
        vc.view = view
        vc.delegate = delegate

        return vc
    }
}

然后像这样使用:

let myCustomAlertViewController = CustomAlertViewController.instantiateFromStoryboard(title: "bla", ...)