iPhone的锁屏监测分为两种方式监听：

1. 程序在前台，这种比较简单。直接使用Darwin层的通知就可以了：

#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;

}

2. 第二种是程序退后台后，这时再锁屏就收不到上面的那个通知了，需要另外一种方式, 以循环的方式一直来检测是否是锁屏状态，会消耗性能并可能被苹果挂起；

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);

    }

}

关于 notify.h 请移步到：

https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/notify_register_check.3.html

iOS开发之应用内检测手机锁屏，解锁状态