如何知道我的macOS应用程序是在后台还是在前台？

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        UIApplication *application = [UIApplication sharedApplication];
        if (application.applicationState == UIApplicationStateActive) {
            NSLog(@"应用程序在前台");
        } else if (application.applicationState == UIApplicationStateBackground) {
            NSLog(@"应用程序在后台");
        } else if (application.applicationState == UIApplicationStateInactive) {
            NSLog(@"应用程序处于非活动状态，例如用户正在切换应用");
        }
    }
    return 0;
}

import UIKit

if UIApplication.shared.applicationState == .active {
    print("应用程序在前台")
} else if UIApplication.shared.applicationState == .background {
    print("应用程序在后台")
} else if UIApplication.shared.applicationState == .inactive {
    print("应用程序处于非活动状态，例如用户正在切换应用")
}

ps aux | grep your_app_name

tell application "System Events"
    set frontApp to name of first application process whose frontmost is true
    if frontApp is "YourAppName" then
        display dialog "应用程序在前台"
    else
        display dialog "应用程序不在前台"
    end if
end tell