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
#defineNotificationLockCFSTR("com.apple.springboard.lockcomplete")
#defineNotificationChangeCFSTR("com.apple.springboard.lockstate")
#defineNotificationPwdUICFSTR("com.apple.springboard.hasBlankedScreen")
staticvoidscreenLockStateChanged(CFNotificationCenterRefcenter,void*observer,CFStringRefname,constvoid*object,CFDictionaryRefuserInfo)
{
NSString*lockstate=(__bridgeNSString*)name;
if([lockstate isEqualToString:(__bridgeNSString*)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；
staticvoidsetScreenStateCb()
{
uint64_t locked;
__blockinttoken=0;
notify_register_dispatch("com.apple.springboard.lockstate",&token,dispatch_get_main_queue(),^(intt){
});
notify_get_state(token,&locked);
NSLog(@"%d",(int)locked);
}
-(void)applicationDidEnterBackground:(UIApplication*)application
{
while(YES){
setScreenStateCb();
sleep(1);
}
}