通過iPhone鎖定屏幕將應用程序置於前台

Question

我有一個應用程序，通過此問題，我設法制作了一個自定義遙控器。 它工作正常，但在我想通過要求用戶解鎖手機來使應用程序出現在前台時，例如apple Musics共享按鈕操作。 是否可以要求用戶解鎖手機並將應用程序帶到前台以完成操作？ 我設法使用本地通知使其工作，但我認為需要有一個警報視圖或用戶與按鈕的交互。 是否可以使它正常工作而沒有彈出窗口？

這是我用來更改鎖定屏幕控制器按鈕的代碼

//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

我認為appdelegate.h中的這些委托方法會有所幫助。 我認為您可以使用最后一個，“應用程序確實處於活動狀態”。

- (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.
}

要么

通過使用通知中心，您可以執行特定類中的任何操作，而我使用過的將進入前台。 根據用戶要求，有不同的選項可用。

- (void)viewDidLoad {

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

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