Question

我想知道窗口何时关闭，我实现了这段代码：

class ViewController: NSViewController, NSWindowDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        let window: NSWindow? = view.window
        window?.delegate = self
    }

    func windowWillClose(_ aNotification: Notification) {
        print("windowWillClose")
    }

}

不幸的是没有任何事情发生，我有什么不对的？

文件：https://developer.apple.com/documentation/appkit/nswindow/1419400-willclosenotification

PS 我已经在没有找到解决方案的情况下阅读了这个问题：Handle close event of the window in Swift

Answer 1

问题在于window属性将始终在viewDidLoadMethod中返回nil。您需要在viewWillAppear方法中设置委托：

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试图了解基于macOS Document的应用程序窗口何时关闭

1 个答案: