xcode - 如何知道 Cocoa 应用程序何时将退出？

Question

我有一个基于 NSDocument 的应用程序。我想知道应用程序何时将退出以验证某些内容。我希望可能有一种方法，例如 applicationWillQuit，但是查看 NSDocument 和 NSApplication 的文档我找不到类似的东西。

Answer 1

There is a notification you can use coming from your NSApplication:

NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
 [nc addObserver:self 
        selector:@selector(appWillTerminate:) 
            name:NSApplicationWillTerminateNotification 
          object:nil];

This is documented here: https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/nsapplication_Class/Reference/Reference.html

By passing the object as nil your method is being called whenever an object fires the notification.

Answer 2

我们在AppDelegate.swift或AppDelegate.m类中有一个委托方法。您可以在关闭它之前使用它并向您的应用程序添加功能。

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