Swift 尝试了解macOS基于文档的应用程序中的窗口何时关闭
我试图知道窗口何时关闭,我实现了以下代码:Swift 尝试了解macOS基于文档的应用程序中的窗口何时关闭,swift,cocoa,Swift,Cocoa,我试图知道窗口何时关闭,我实现了以下代码: class ViewController: NSViewController, NSWindowDelegate { override func viewDidLoad() { super.viewDidLoad() let window: NSWindow? = view.window window?.delegate = self } func windowWillClo
class ViewController: NSViewController, NSWindowDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let window: NSWindow? = view.window
window?.delegate = self
}
func windowWillClose(_ aNotification: Notification) {
print("windowWillClose")
}
}
不幸的是什么都没发生,我会做错什么
文件:
PS
我已经阅读了这个问题,但没有找到解决方案:问题是window属性在viewDidLoadMethod中总是返回nil。您需要在VIEWWILLEXPENCE方法中设置委托:
class ViewController: NSViewController, NSWindowDelegate {
override func viewWillAppear() {
super.viewWillAppear()
view.window?.delegate = self
}
func windowWillClose(_ aNotification: Notification) {
print("windowWillClose")
}
}
存在的问题是,window属性在viewDidLoadMethod中始终返回nil。您需要在VIEWWILLEXPENCE方法中设置委托:
class ViewController: NSViewController, NSWindowDelegate {
override func viewWillAppear() {
super.viewWillAppear()
view.window?.delegate = self
}
func windowWillClose(_ aNotification: Notification) {
print("windowWillClose")
}
}