Objective-C：带有提醒的应用程序即使在应用程序被终止或 phone 重新启动时也能正常工作

Question

在下面的代码中，我设法每 15 秒触发我的 checkSchedule 方法（出于测试目的），checkSchedule 将发送一个 API 然后检查是否有任何约会.如果connectionFinishLoading检测到结果，会通知用户

如果应用程序在前台或后台，当前代码将起作用。

但是，我希望在应用程序被终止或 phone 重新启动并且应用程序未启动时让它工作。基本上，该功能类似于Any.do app（提醒应用程序），即使应用程序被杀死或phone 重新启动也会触发提醒。非常感谢任何指点或帮助。

@AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    [self startTimerLoop];

    return YES;
}

//==== This loop will run every hour and call Check Schedule,
//==== It will break the 3 min barrier
-(void)startTimerLoop{
    //NSLog(@"Hi I am in the timer .. %@ ", [NSDate date]);
    [objTimer invalidate];
    objTimer = nil;

    //===repeat every 15 secs for testing purposes
    bgTask = UIBackgroundTaskInvalid;
    UIApplication *app = [UIApplication sharedApplication];
    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{}];
    objTimer = [NSTimer scheduledTimerWithTimeInterval:15 target:self   selector:@selector(checkSchedule) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:objTimer forMode:UITrackingRunLoopMode];

}

//=== Check from 2 hours from now if there is any classes
//=== it will send and web API and is it return a result,
//=== it will notify the user
-(void)checkSchedule{

    //=== Initialize the responseData Mutable Data
    self.responseData = [NSMutableData data];

    //=== Call the stored txtMemCode, something like session ---
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSString *sMemCode = [defaults objectForKey:@"txtMemCode"];

    NSDate *now = [NSDate date];
    NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
    [outputFormatter setDateFormat:@"HH:mm"];
    NSString *sTime = [outputFormatter stringFromDate:now];
    sTime = [sTime stringByReplacingOccurrencesOfString:@":" withString:@"%3A"];
    //====Check from 2 hours from now====
    NSTimeInterval secInTwoHours = 2*60*60; //=== sec in 2 hours
    NSDate *twoHoursAhead = [now dateByAddingTimeInterval:secInTwoHours];
    NSString *sTime2Hours = [outputFormatter stringFromDate:twoHoursAhead];
    sTime2Hours = [sTime2Hours stringByReplacingOccurrencesOfString:@":" withString:@"%3A"];

    if (sMemCode != nil) {
        //=== Pass the string to web and get the return State response.write
        sURL = gURL;
        sURL = [sURL stringByAppendingString:@"/apps/checkBooking.asp?"];
        sURL = [sURL stringByAppendingString:@"memCode="];
        sURL = [sURL stringByAppendingString:sMemCode];
        sURL = [sURL stringByAppendingString:@"&tocheck="];
        sURL = [sURL stringByAppendingString:sTime];
        sURL = [sURL stringByAppendingString:@"&tocheck2="];
        sURL = [sURL stringByAppendingString:sTime2Hours];

        NSLog(@" The sURL : %@ ", sURL);

        NSURLRequest *requestState = [NSURLRequest requestWithURL:[NSURL URLWithString:sURL]];

        (void) [[NSURLConnection alloc] initWithRequest:requestState delegate:self];
    }
}

//=== This getting the return results from the called API.
//=== If there is a result, it will notify the user.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"connectionDidFinishLoading");
    NSLog(@"=========Succeeded! Received %d bytes of data",[self.responseData length]);

    NSString *sResponseData = [[NSString alloc] initWithData:self.responseData encoding:NSUTF8StringEncoding];
    NSLog(@"=======*************** This Response.write stuff %@", sResponseData);

    NSString *sSeparator= @"|";

    NSRange range = [sResponseData rangeOfString:sSeparator];
    NSInteger position = range.location + range.length;
    NSString *sRecords = [sResponseData substringToIndex:position-1];
    NSString *sRemaining = [sResponseData substringFromIndex:position];

    if ([sRecords isEqualToString:@"0"]){
        NSLog(@" There is no classes ");
    }else {
        range = [sRemaining rangeOfString:sSeparator];
        position = range.location + range.length;
        NSString *sMessage = [sRemaining substringToIndex:position-1];
        NSString *sTime = [sRemaining substringFromIndex:position];

        NSString *sBody = sMessage;
        sBody = [sBody stringByAppendingString:@" "];
        sBody = [sBody stringByAppendingString:sTime];

        UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];

        content.title = [NSString localizedUserNotificationStringForKey:@"Class Reminder!"
                                                          arguments:nil];

        content.body = [NSString localizedUserNotificationStringForKey:sBody
                                                         arguments:nil];
        content.sound = [UNNotificationSound defaultSound];

        UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1 repeats:NO];

        UNNotificationRequest *notificationRequest = [UNNotificationRequest requestWithIdentifier:@"NotificationIdentifier" content:content trigger:trigger];

        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        [center addNotificationRequest:notificationRequest
             withCompletionHandler:^(NSError * _Nullable error) {
                 NSLog(@"completed!");
         }];
    }

    [[UIApplication sharedApplication] endIgnoringInteractionEvents];

}

Answer 1

必须按照 Firebase 的说明设置远程通知。

// Handle incoming notification messages while app is in the foreground.
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
   willPresentNotification:(UNNotification *)notification
     withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
// Print message ID.
NSDictionary *userInfo = notification.request.content.userInfo;
if (userInfo[kGCMMessageIDKey]) {
    NSLog(@"**3 :  Message ID: %@", userInfo[kGCMMessageIDKey]);
}

// Print full message.
NSLog(@" **4 : %@", userInfo);

//==== This will show the notification while APP is in the foreground
completionHandler(UNNotificationPresentationOptionSound | UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionBadge);
//completionHandler(UNNotificationPresentationOptionNone);

}