I'm not sure if an iOS app can post a notification from the background without internet connection? (so this is not a push notification, just to post from phone)
Example: An iOS app that plays music in background can prompt user how long the user has listened to music from background.
I think you should use local notification, please see the below code for local notification,
NSDate *alertTime = [[NSDate date]
dateByAddingTimeInterval:10];
UIApplication* app = [UIApplication sharedApplication];
UILocalNotification* notifyAlarm = [[UILocalNotification alloc]
init];
if (notifyAlarm)
{
notifyAlarm.fireDate = alertTime;
notifyAlarm.timeZone = [NSTimeZone defaultTimeZone];
notifyAlarm.repeatInterval = 0;
notifyAlarm.soundName = #"bell_tree.mp3";
notifyAlarm.alertBody = #"Staff meeting in 30 minutes";
[app scheduleLocalNotification:notifyAlarm];
}
With these requirements in the mind, the following code creates an NSDate object based on the current date and time plus 10 seconds. This date object is then used to schedule a notification with no repeats, a text message and the sound from the audio file
The local notifications in iOS can help you to fix the problem. May be this tutorial helps you.
Related
I have simple UILocalNotification:
UILocalNotification *notification = [[UILocalNotification alloc] init];
notification.alertBody = #"Message";
notification.alertAction = #"Action";
notification.soundName = UILocalNotificationDefaultSoundName;
notification.category = kCategoryIdentifier;
[[UIApplication sharedApplication] presentLocalNotificationNow:notification];
Is it possible, to repeat notification once, for example after two minutes? I want behaviour exacly, like in Messages app.
I have tried to set repeatInterval property of notification object, but:
Notification will be presented to user every two minutes, not repeated only once
System shows to user new notification, not repeat the old one. User see two notifications, one with timestamp 2 minutes after another.
Which is not what I've expected.
Also, because of second reason, I don't want to schedule two separate notifications.
Edit: In my app time when something happend is very important. Because of that, in lock screen, when notification is repeated, I want user to know that is something that happend earlier, not in time when notification arrives. So repeated notification should have timestamp of first notification.
Yes, you can set repeatInterval.
See documentation here
The calendar interval at which to reschedule the notification.
Declaration SWIFT var repeatInterval: NSCalendarUnit OBJECTIVE-C
#property(nonatomic) NSCalendarUnit repeatInterval
try this code
localNotif.timeZone = [NSTimeZone systemTimeZone];
localNotif.alertBody = #"Message";
localNotif.alertAction = #"View";
localNotif.soundName = UILocalNotificationDefaultSoundName;
localNotif.applicationIconBadgeNumber=1;
NSLog(#"LocalNotif.soundName %#",localNotif.soundName);
for (int i=0; i<20; i++)
{
localNotif.fireDate = [repeatAlarm dateByAddingTimeInterval:120*i];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
}
I am working on Alarm module in my app. I have develop code which take date and time input from user and set Event on that particular time in my app.
Also i store information into my local database to display list of alarm set by user.
Now i want to delete entry from database when particular alarm executed (When UILocalNotification displayed into app i want to call database method to delete that entry from db)
I set Notification by this way
NSUserDefaults* preferences = [NSUserDefaults standardUserDefaults];
int notificationCount = [preferences integerForKey:#"notification_count"];
notificationCount++;
NSDate* final_date = [calendar dateFromComponents:final_Components];
UILocalNotification *localNotification = [[UILocalNotification alloc]init];
localNotification.fireDate = final_date;
localNotification.alertBody=titleTextField.text;localNotification.soundName = UILocalNotificationDefaultSoundName;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.applicationIconBadgeNumber = 1;
NSDictionary* userInfoDic = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:notificationCount] forKey:#"notification_id"]; localNotification.userInfo = userInfoDic;
localNotification.repeatInterval = 0;
[[UIApplication sharedApplication]scheduleLocalNotification:localNotification];
[preferences setInteger:notificationCount forKey:#"notification_count"];
I used Delegate didReceiveLocalNotification
-(void) application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
NSString *itemName = [notification.userInfo objectForKey:#"notification_id"];
NSLog(#"userInfo is %#",itemName);
databaseObject.deleteNotification(itemName)
}
My problem is "didReceiveLocalNotification" only call in 2 case
1) When user using app (app in foreground).
2) when notification displayed and user click on notification
But in 3rd case when app is in background mode and notification displayed and if user don't click on notification Or second case is open app directly clicking on app icon or user clear notification at that time didReceiveLocalNotification delegate is not get called..
Is there any way to detect Notification fire in all case or any other method by using i can detect that notification has been fire and then i will execute my delete method.
Any help is appreciated
Thank you
Yes, you are right, you won't know the information of the notification if your notification fires while your app is suspended/terminated and user didn't tap the notification to launch/active your app.
The only way to do this is to calculate the time every time your app is running and reschedule notifications and update your database.
For millisecond calculation:
NSInteger myMillisecond; //assume it exists
const NSTimeInterval oneSecondAsMilliseconds = 1000.0;
NSTimeInterval myTimeInterval = myMillisecond/oneSecondAsMilliseconds;
NSDate *currentDate = [NSDate date];
NSTimeInterval currentTimeStamp = [currentDate timeIntervalSince1970];
if (myTimeInterval > currentTimeStamp) {
//myTimeInterval is a later time than now
}
I am working on a Contact manager app in which i have to schedule birthday notifications of contacts that have birthday on same day or one day before the current date. Can i do it in background or when my app is not running.
Is it possible? If Yes then give some helpful links or blogs.
Thanks
You cannot register for local notifications when you are in background.
Use the below code to register for local notification.
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.alertBody = #"Your text";
localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:120.0]; // your date
[[UIApplication sharedApplication]scheduleLocalNotification:localNotification];
When your are in foreground, your application:didReceiveLocalNotification will be called.
When you are in background or your app is terminated, you will get the local notification in Notification panel of the device
I am developing an app that will fire an alarm and play 5 secs of a song the user select, or the default sound every x time depending on the user input.. my problem is I do not know how to create this alarm, I have tried with UILocalNotification, but the problem is how I made the alarm sound again even if my application is on background?
here is what I've got so far:
UILocalNotification *notification = [[UILocalNotification alloc] init];
NSDate * secs = [[NSDate alloc] initWithTimeIntervalSinceNow:i*[secs doubleValue]];
notification.alertBody = #"Alarm";
notification.soundName = UILocalNotificationDefaultSoundName;
notification.fireDate = secs;
[[UIApplication sharedApplication] scheduleLocalNotification:notification];
but how could I make the notification and also, how to make the sound play a user song even in background... I have also tried with NSTimer but it stops when the app is moved to background
Use NSTimer when the app is in the foreground.
Look at the repeatInterval property of UILocalNotification for running in the background.
I want to cancel an iOS local notification after a particular time.
For example : a week later
- (void)ViewDidLoad
{
NSDate *date = [NSdate date];
UILocalNotification *localNotif = [[UILocalNotification alloc] init];
//set some localNotif's properties
localNotif.repeatInterval = NSDayCalendarUnit;
localNotif.fireDate = date
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
}
How can I cancel localNotif after a week (7 days) and can you show me the code?
You can't do that unless your app is running in the foreground at the time the notification is due to be cancelled (in which case there would be no need to cancel it anyway).
The reason you can't do it is because you would need a timer to tell you when to cancel it, and you can't schedule a timer unless you are an app that has a background mode, in which case you could schedule a timer to notify you - but even background apps can be suspended still it would not be guaranteed.
See here
iOS Run Code Once a Day