ios - 如何以编程方式从 UIVIew 呈现 View Controller

Question

我使用的类是 MessageView ( Swift Message Library) 的子类，继承自 UIView。在里面，我有一个 UIButton，我想通过它以编程方式呈现另一个 ViewController。

下面是我的代码:

import Foundation
import SwiftMessages
import UIKit

class MyClass: MessageView {

    var hideBanner: (() -> Void)?


    @IBAction func helpButtonPressed(_ sender: UIButton) {
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "newViewController") as! NewViewController
        self.present(newViewController, animated: true, completion: nil)

    @IBAction func tryAgainButtonPressed(_ sender: UIButton) {
        hideBanner?()
    }

    open override func awakeFromNib() {

    }

}

我试过这个，但它不起作用，因为 UIView 没有 present 方法。

Answer 1

首先使用这个获取顶级 ViewController。然后你可以展示你的 viewController。

if var topController = UIApplication.sharedApplication().keyWindow?.rootViewController {
    while let presentedViewController = topController.presentedViewController {
        topController = presentedViewController
    }

    // topController now can use for present.
    let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let newViewController = storyBoard.instantiateViewController(withIdentifier: "newViewController") as! NewViewController
    topController.present(newViewController, animated: true, completion: nil)
}