Question

我正在尝试创建一个包含视图控制器的框架（登录VC）。我已经成功导入了框架并介绍了VC，但是视图未显示。我在导入的viewDidLoad中具有打印功能，并且正在打印。我想念什么？

框架VC：

public class LoginVC: UIViewController {

    @IBOutlet weak var button: UIButton! {
        didSet {
            button.addTarget(self, action: #selector(buttonPressed), for: .touchUpInside)
        }
    }

    public override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override public func viewDidLoad() {
        super.viewDidLoad()
        print("View Loaded") // Firing
    }

    @objc func buttonPressed() {
        print("hello")
    }

}

框架VC Xib：

当我展示VC框架时，这是视图调试器

-更新：这就是我展示VC的方式---

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    let homeViewController = LoginVC()
    homeViewController.view.backgroundColor = UIColor.white
    window!.rootViewController = homeViewController
    window!.makeKeyAndVisible()
    return true
}

-更新-

由于许多评论与应用程序委托有关，因此我首先介绍一个通用的ViewController，然后再介绍我的登录框架VC。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    let homeViewController = ViewController()
    homeViewController.view.backgroundColor = UIColor.white
    window!.rootViewController = homeViewController
    window!.makeKeyAndVisible()
    return true
}


class ViewController: UIViewController {

   @IBOutlet weak var button: UIButton! {
       didSet {
           button.addTarget(self, action: #selector(presentNext), for: .touchUpInside)
       }
   }

    @objc func presentNext() {
        let loginVC = LoginVC()
        present(loginVC, animated: true, completion: nil)
    }

}

现在，当我介绍登录框架时，我得到的只是一个黑屏。

-更新-

我可以在viewdidLoad中更改视图的背景颜色，但不会显示xib视图。为什么会这样？..

Answer 1

将xib连接到viewController的框架需要从捆绑中显式加载。

通常，当我们使用xib创建cocoaTouch UIViewController时，将为我们处理此问题。但是，在使用框架时，不会对其进行处理。

为解决此问题，我在viewDidLoad中添加了xib加载

override func viewDidLoad() {
    super.viewDidLoad()

    // Frameworks require loading of the xib to connect xib to view controller
    let bundle = Bundle(for: type(of: self))
    bundle.loadNibNamed("viewControllerName", owner: self, options: nil)
}

Answer 2

ViewController 实际出现后，您需要调用 presentNext（）-不在 viewDidLoad 中，甚至不在中> viewWillAppear 。

赞：

class ViewController: UIViewController {

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        presentNext()
    }
    @objc func presentNext() {
        let loginVC = LoginVC()
        present(loginVC, animated: true, completion: nil)
    }

}

这是正在运行的测试项目：

https://github.com/drewster99/SO_LoginVC

此外，也许再次检查一下您的ViewController.xib是否已为按钮实际附加了IBOutlet。实际上必须是那样。其他一切看起来都很好。

这就是我所拥有的：

AppDelegate：

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {


    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        window = UIWindow(frame: UIScreen.main.bounds)
        let homeViewController = ViewController()
        homeViewController.view.backgroundColor = UIColor.white
        window!.rootViewController = homeViewController
        window!.makeKeyAndVisible()
        return true
    }
}

ViewController.swift：

import UIKit
import LoginFrameworkThing

class ViewController: UIViewController {

    @IBOutlet weak var button: UIButton! {
        didSet {
            button.addTarget(self, action: #selector(presentNext), for: .touchUpInside)
        }
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
    }

    @objc func presentNext() {
        print("Presenting next...")
        let loginVC = LoginVC()
        present(loginVC, animated: true, completion: nil)
    }
}

该按钮已连接到ViewController中，并且框架中存在LoginVC（.xib和.swift）。

我更新了示例项目。检查链接。

框架ViewController视图未显示

2 个答案: