swift - cocoa Mac : creating window from AppDelegate

Question

我正在寻找一个从 AppDelegate 创建窗口的简单(且特定于 Mac)示例。我的程序有一个登录页面，该页面可能需要也可能不需要在应用程序启动时显示，具体取决于用户是否已经登录。

到目前为止，我的 AppDelegate 的 applicationDidFinishLaunching 看起来像这样:

func applicationDidFinishLaunching(_ aNotification: Notification) {
    // Insert code here to initialize your application

    let main = NSStoryboard(name : "Main", bundle: nil).instantiateController(withIdentifier: "MainWindow") as! NSWindowController

    main.window?.becomeFirstResponder()

    let mainVc = NSStoryboard(name:"Main", bundle: nil).instantiateController(withIdentifier: "MainViewController") as! ViewController
    main.window?.contentViewController = mainVc
}

但是当我运行应用程序时，什么也没有发生。我应该注意到我已经取消设置应用程序设置的“主界面”属性。如果我不取消设置，则会出现我想要的两个 版本的窗口，这表明我几乎上面的内容是正确的。

我错过了什么？

Answer 1

您需要在 applicationDidFinishLaunching 方法之外声明 NSWindowController 变量 main。您还需要调用 makeKeyAndOrderFront(nil) 而不是 becomeFirstResponder:

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    var main: NSWindowController!

    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Insert code here to initialize your application

        main = NSStoryboard(name : "Main", bundle: nil).instantiateController(withIdentifier: "MainWindow") as! NSWindowController
        let mainVc = NSStoryboard(name:"Main", bundle: nil).instantiateController(withIdentifier: "MainViewController") as! ViewController
        main.window?.contentViewController = mainVc
        main.window?.makeKeyAndOrderFront(nil)

    }
    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
    }
}