#import <notify.h>#define NotificationLock CFSTR("com.apple.springboard.lockcomplete")#define NotificationChange CFSTR("com.apple.springboard.lockstate")#define NotificationPwdUI CFSTR("com.apple.springboard.hasBlankedScreen")static void screenLockStateChanged(CFNotificationCenterRef center,void* observer,CFStringRef name,const void*object,CFDictionaryRef userInfo){  NSString* lockstate = (__bridge NSString*)name;  if ([lockstate isEqualToString:(__bridge NSString*)NotificationLock]) {    NSLog(@"locked.");  } else {    NSLog(@"lock state changed.");  }}- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{  // Override point for customization after application launch.  CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, screenLockStateChanged, NotificationLock, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);  CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, screenLockStateChanged, NotificationChange, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);  //setScreenStateCb();  return YES;}

static void setScreenStateCb(){　　  uint64_t locked;  __block int token = 0;  notify_register_dispatch("com.apple.springboard.lockstate",&token,dispatch_get_main_queue(),^(int t){  });  notify_get_state(token, &locked);  NSLog(@"%d",(int)locked);}- (void)applicationDidEnterBackground:(UIApplication *)application{  while (YES) {    setScreenStateCb();    sleep(1);  }}