如何跟踪“Moment”应用程序的iPhone使用情况？

Question

How to track total usage of iPhone, even if our app is running in background(not forcefully terminated). Recently i have come across app, namely Moment this app does track your iPhone usages, even if this app is running in background. actually they are using location service to get execution time. my question is when they get execution time, how they can be sure if user's iPhone screen lock or unlock ?

i have code to check if screen is lock or unlock

-(void)registerAppforDetectLockState {

    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) {
            NSLog(@"unlock device");

            UIAlertView *errorAlert = [[UIAlertView alloc]
                                       initWithTitle:@"unlock device" message:@"test" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [errorAlert show];


        } else {
            NSLog(@"lock device");

            UIAlertView *errorAlert = [[UIAlertView alloc]
                                       initWithTitle:@"lock device" message:@"test" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [errorAlert show];

        }

    });
}

but this code is working only when app is running in foreground.

Answer 1

您的代码仅在应用程序在前台运行时才起作用，因为当应用程序进入后台时，它不会被调用，您必须使用其中一种后台模式来唤醒您的应用程序才能执行您的代码。