在 Mac 上的 Swift 4 上没有收到屏幕锁定通知

Question

由于某种原因，我没有收到屏幕已锁定和屏幕已解锁通知。我定义了屏幕保护程序启动后 0 秒屏幕被锁定，但没有日志：

import Cocoa
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
    @objc func screenLocked() {
        NSLog("yes")
    }
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Insert code here to initialize your application
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(AppDelegate.screenLocked),
            name: Notification.Name("com.apple.screenIsLocked"),
            object: nil)
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(AppDelegate.screenLocked),
            name: Notification.Name("com.apple.screenIsUnlocked"),
            object: nil)
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(AppDelegate.screenLocked),
            name: Notification.Name("com.apple.screensaver.didstart"),
            object: nil)
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(AppDelegate.screenLocked),
            name: Notification.Name("com.apple.screensaver.didstop"),
            object: nil)

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

}

Answer 1

使用 NSDistributedNotificationCenter

这是来自Kane Cheshire的一篇文章：

https://kanecheshire.com/blog/2014/10/13/351/

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    NSDistributedNotificationCenter *center = [NSDistributedNotificationCenter defaultCenter];
    [center addObserver:self
               selector:@selector(screenLocked)
                   name:@"com.apple.screenIsLocked"
                 object:nil];
    [center addObserver:self
               selector:@selector(screenUnlocked)
                   name:@"com.apple.screenIsUnlocked"
                 object:nil];
}

在斯威夫特中：

DistributedNotificationCenter.default().addObserver(self,
                                                    selector: #selector(screenLocked),
                                                    name: "com.apple.screenIsLocked",
                                                    object: nil)
DistributedNotificationCenter.default().addObserver(self,
                                                    selector: #selector(screenLocked),
                                                    name: "com.apple.screenIsUnlocked",
                                                    object: nil)

Answer 2

现在通知名称的语法略有不同。

        DistributedNotificationCenter.default().addObserver(forName: NSNotification.Name(rawValue: "com.apple.screenIsLocked"),
                                                            object: nil,
                                                            queue: .main) { [weak self] _ in
// Handle it
        }
        
        DistributedNotificationCenter.default().addObserver(forName: NSNotification.Name(rawValue: "com.apple.screenIsUnlocked"),
                                                            object: nil,
                                                            queue: .main) { [weak self] _ in
// Handle it
        }