将应用程序从 iPhone 锁定屏幕带到前台

Question

我有一个应用程序，我设法在this question on stack overflow 的帮助下制作了一个自定义遥控器。 它工作正常，但我想通过要求用户解锁手机来将应用程序带到前台，比如苹果音乐分享按钮操作。是否可以要求用户解锁手机并将应用程序置于前台以完成操作？ 我设法使用本地通知使其工作，但我认为需要有一个警报视图或用户与按钮的交互。是否可以在不弹出任何窗口的情况下使其工作？

这是我用来更改锁屏控制器按钮的代码

//App delegate   
-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]){

    [application registerUserNotificationSettings:[UIUserNotificationSettings
                                                   settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|
                                                   UIUserNotificationTypeSound categories:nil]];
   }
}

// inside viewDidLoad
MPRemoteCommandCenter *rcc = [MPRemoteCommandCenter sharedCommandCenter];
MPFeedbackCommand *likeCommand = [rcc likeCommand];
[likeCommand setEnabled:YES];
[likeCommand setLocalizedTitle:@"I love it"];  // can leave this out for default
[likeCommand addTarget:self action:@selector(likeEvent:)];

MPFeedbackCommand *dislikeCommand = [rcc dislikeCommand];
[dislikeCommand setEnabled:YES];
[dislikeCommand setActive:YES];
[dislikeCommand setLocalizedTitle:@"I hate it"]; // can leave this out for default
[dislikeCommand addTarget:self action:@selector(dislikeEvent:)];

BOOL userPreviouslyIndicatedThatTheyDislikedThisItemAndIStoredThat = YES;

if (userPreviouslyIndicatedThatTheyDislikedThisItemAndIStoredThat) {
       [dislikeCommand setActive:YES];
    }

//Selectors:
 -(void)dislikeEvent: (MPFeedbackCommandEvent *)feedbackEvent
{
//I need to ask user to unlock the phone and bring app to foreground
NSLog(@"Mark the item disliked");
}
-(void)likeEvent: (MPFeedbackCommandEvent *)feedbackEvent
{
    //I need to ask user to unlock the phone and bring app to foreground
    NSLog(@"Mark the item liked");

   UILocalNotification *notification = [[UILocalNotification alloc] init];
notification.fireDate = [NSDate dateWithTimeIntervalSinceNow:0];
notification.alertBody = @"This is local notification!";
notification.timeZone = [NSTimeZone defaultTimeZone];
notification.soundName = UILocalNotificationDefaultSoundName;

[[UIApplication sharedApplication] scheduleLocalNotification:notification];
}

Answer 1

我认为 appdelegate.h 中的这些委托方法会有所帮助。 我认为您可以使用最后一个，“应用程序确实已激活。”

- (void)applicationDidEnterBackground:(UIApplication *)application {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

或

通过使用通知中心，您可以在特定类中执行任何操作，我使用过的将进入前台。根据用户要求，有不同的选项可供选择。

- (void)viewDidLoad {

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appReturnToForeground) name:UIApplicationWillEnterForegroundNotification object:nil];
}

- (void)appReturnToForeground {
    // Your code...What you want to perform.
}