Check device is locked or unlocked

Question

I use the following code to check iphone lock state.

int notify_token;

notify_register_dispatch("com.apple.springboard.lockstate", &notify_token,dispatch_get_main_queue(), ^(int token) {

    uint64_t state = UINT64_MAX;
    notify_get_state(token, &state);

    if (state == 0)
    {
        // Locked
    }
    else
    {
        // Unlocked
    }
});

The problem is that we get notification only if device is locked or unlocked. I want to know the current lock status. ie. I have started the app and at any point of time I want to know whether device is locked or unlocked. Using the above code we will be notified only when device is locked or unlocked by the user.

Is there any alternatives for this?

Answer 1

Refer

static void displayStatusChanged(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
    // the "com.apple.springboard.lockcomplete" notification will always come after the "com.apple.springboard.lockstate" notification
    CFStringRef nameCFString = (CFStringRef)name;
    NSString *lockState = (NSString*)nameCFString;
    NSLog(@"Darwin notification NAME = %@",name);

    if([lockState isEqualToString:@"com.apple.springboard.lockcomplete"])
    {
        NSLog(@"DEVICE LOCKED");
        //Logic to disable the GPS
    }
    else
    {
        NSLog(@"LOCK STATUS CHANGED");
        //Logic to enable the GPS
    }
}

-(void)registerforDeviceLockNotif
{
    //Screen lock notifications
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center
                                NULL, // observer
                                displayStatusChanged, // callback
                                CFSTR("com.apple.springboard.lockcomplete"), // event name
                                NULL, // object
                                  CFNotificationSuspensionBehaviorDeliverImmediately);

     CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), //center
                                NULL, // observer
                                displayStatusChanged, // callback
                                CFSTR("com.apple.springboard.lockstate"), // event name
                                NULL, // object
                                CFNotificationSuspensionBehaviorDeliverImmediately);
}

Moreover you can set Global bool variable and set its value whether device is locked or not.

Answer 2

Swift:

/**
 Start listen "Device Locked" notifications
 */
func registerforDeviceLockNotif() {
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),
                                nil,
                                {(center: CFNotificationCenter!, observer: UnsafeMutablePointer<Void>, name: CFString!, object: UnsafePointer<Void>, userInfo: CFDictionary!) -> Void in
                                    // the "com.apple.springboard.lockcomplete" notification will always come after the "com.apple.springboard.lockstate" notification
                                    let lockState = name as String
                                    if lockState == "com.apple.springboard.lockcomplete" {
                                        NSLog("DEVICE LOCKED");
                                    }
                                    else {
                                        NSLog("LOCK STATUS CHANGED");
                                    }

        },
                                "com.apple.springboard.lockcomplete",
                                nil,
                                CFNotificationSuspensionBehavior.DeliverImmediately)
}