iOS 检测屏幕状态（是否锁屏）

一.实现监听

1.定义宏

//锁屏通知
#define NotificationOff CFSTR("com.apple.springboard.lockcomplete")

//解锁通知
#define NotificationOn CFSTR("com.apple.springboard.hasBlankedScreen")

2.注册屏幕监听事件

    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, ListeningScreenLockState, NotificationOff, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
    
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, ListeningScreenLockState, NotificationOn, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);

3.监听方法

static void ListeningScreenLockState(CFNotificationCenterRef center,void* observer,CFStringRef name,const void* object,CFDictionaryRef userInfo)

{
    
    NSString* screenState = (__bridge NSString*)name;
    
    if ([screenState isEqualToString:(__bridge  NSString*)NotificationOff]) {
        
        NSLog(@"********锁屏**********");
        
    } else {
        
        NSLog(@"********解锁**********");
     
    }
    
}

二.监听结果 调用方法

由于监听方法为C函数 需要在c函数里面调用iOS 方法

1.将类定义成：

static MinshLivenessViewController *selfClass = nil;

2. self赋给selfClass

selfClass = self;(我是将这句代码写在viewDidLoad 里面)

3.在c函数里面调用：

[selfClass 方法名];