在OSX Cocoa中接收笔记本电脑电源线打开/关闭的通知

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate>
@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    NSNotificationCenter *center = [[NSWorkspace sharedWorkspace] notificationCenter];
    [center addObserver:self selector:@selector(powerStateChanged:) name:NSWorkspacePowerStateChangedNotification object:nil];
}

- (void)powerStateChanged:(NSNotification *)notification {
    NSDictionary *userInfo = notification.userInfo;
    NSNumber *powerState = userInfo[NSWorkspacePowerStateKey];
    
    if (powerState.intValue == NSWorkspacePowerStateRunningOnBattery) {
        NSLog(@"电源线已断开，正在使用电池供电。");
    } else if (powerState.intValue == NSWorkspacePowerStateRunningOnExternalPower) {
        NSLog(@"电源线已连接，正在使用外接电源。");
    }
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSApplication *application = [NSApplication sharedApplication];
        AppDelegate *appDelegate = [[AppDelegate alloc] init];
        [application setDelegate:appDelegate];
        [application run];
    }
    return 0;
}