I'm a beginner of iOS development. I'm now developing a battery utility app in my university project. In my Settings column, I have an option to let user to turn on or off for whether you want to get a notification when the battery is fully charged. I've a problem of getting local notification when the switch is on. I only get an alert view when I tried to turn off the switch and turn it on back when the battery level == 1.0. Appreciate if someone could help me with this. :)
Here's my codes:
-(void)notifySwitched
{
if([self.notifyFullyChargedSwitch isOn])
{
float batterylevel = [UIDevice currentDevice].batteryLevel;
[UIDevice currentDevice].batteryMonitoringEnabled = YES;
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(batteryLevelChanged:) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
[self notifyFullyCharged];
}
}
-(void)notifyFullyCharged{
float batterylevel = [UIDevice currentDevice].batteryLevel;
if(batterylevel == 1.0){
// Schedule the notification
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
//localNotification.fireDate = pickerDate;
localNotification.alertBody = #"Unplug your device. Your battery has been fully charged.";
localNotification.alertAction = #"Slide to view";
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
}
}
The code actually adds observer only when the switch is turned ON for the first time. Moving the following code to any initialise method example:- ViewDownload, should add the observer irrespective of switch state.
[UIDevice currentDevice].batteryMonitoringEnabled = YES;
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(batteryLevelChanged:) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
Then in the batteryLevelChanged method, the switch state condition needs to be checked before showing the alert.
Hope this helps.
Related
I need to clear already displayed local notification from Notification Centre programmatically. Following this link I implemented suggested solution, but the problem is that eventArray from this example always has 0 elements. When I swipe down to display Notification Centre I see 4 notifications that I've created previously. So in this case I expect this array to have 4 elements, but it has 0. Any idea why is this so? I've tried on iOS 8.3 and 9.2.1 and array is 0 on both of them.
iOS has 2 ways of presenting local notifications:
From Notification Center:
You can't swipe away notification from left to right.
You can swipe notification from right to left (deleting single notification from the list).
You can click on the notification, after which your app will start and notification will be removed from Notification Center (handled by iOS system)
From Lock screen:
Available only if you enable this setting from iPhone/iPad settings: http://www.imore.com/how-disable-notification-center-lock-screen-your-iphone-and-ipad
You can swipe notification from left to right (your app will be started, handled by iOS). In this case notification from Notification Center is not deleted (iOS doesn't delete it, and doesn't allow deleting a single notification from code after notification is already presented to the user in Notification Center).
You can swipe notification from right to left (deleting single notification from the list, handled by iOS. Notification Center notification is also deleted, handled by iOS).
You can't click on the notification.
EDIT:
Here is code sample how I did it:
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.alertBody = #"1";
localNotification.alertTitle = #"1";
localNotification.userInfo = uniqueDictIdentifier1;
[[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
UILocalNotification *localNotification2 = [[UILocalNotification alloc] init];
localNotification2.alertBody = #"2";
localNotification2.alertTitle = #"2";
localNotification2.userInfo = uniqueDictIdentifier2;
[[UIApplication sharedApplication] presentLocalNotificationNow:localNotification2];
....
//2 more notifications are created like this
And then there is code for filtering all notifications:
NSArray *eventArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
for (int i=0; i<[eventArray count]; i++) {
UILocalNotification* oneEvent = [eventArray objectAtIndex:i];
NSDictionary *userInfoCurrent = oneEvent.userInfo;
if ([userInfoCurrent isEqualToDictionary:uniqueDictIdentifier1]) {
[[UIApplication sharedApplication] cancelLocalNotification:oneEvent];
break;
}
}
For saving a notification for a unique id
NSDictionary * infoDict = #{ #"alarmUiqueId" : uID,
};
NSLog(#"%#",infoDict);
NSDateComponents *comp = [[NSCalendar currentCalendar] components:NSCalendarUnitSecond
fromDate:fireDate];
fireDate = [fireDate dateByAddingTimeInterval:-comp.second];
UILocalNotification *localNotif = [[UILocalNotification alloc] init];
localNotif.fireDate = fireDate;
localNotif.timeZone = [NSTimeZone localTimeZone];
localNotif.alertBody = desString;
localNotif.userInfo = infoDict;
localNotif.repeatInterval = NSCalendarUnitDay;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif]
and for delete a paritcular notification write this code.
NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
for(UILocalNotification *notification in notificationArray)
{
NSLog(#"%#",[notification.userInfo valueForKey:#"alarmUiqueId"]);
if ([[notification.userInfo valueForKey:#"alarmUiqueId"] isEqualToNumber: health.uniqueId])
{
[[UIApplication sharedApplication] cancelLocalNotification:notification] ;
}
}
My understanding is below:
You can not get the information of already notified LocalNotification with scheduledNotifications.
My resolution is that just keep UILocalNotification instance in your singleton object in your application, and call cancelLocalNotification with the instance when you want to delete from Notification Center.
Is this could be your help ?
When I create my local notification callback didReceiveLocalNotificationgets triggered. The same callback gets triggered when I click on the local notification. Currently I was dividing those two cases by checking
if ([UIApplication sharedApplication].applicationState == UIApplicationStateInactive) {
//this means notification is clicked
}
But the main problem here is that when you are in the foreground and you slide your notification menu, and then receive your local notification, this callback didReceiveLocalNotification gets called. And in this case my app goes into this if. Because of this, I can't really distinguish from clicking the notification and creating a local notification while app is in the inactive state. Any ideas on how can I fix this?
This is the code for scheduling a local notification:
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.alertBody = #"aaaa";
localNotification.alertTitle = #"title";
localNotification.userInfo = myUserInfo;
[[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
After calling this, I get didReceiveLocalNotification delegate triggered.
I had to work around the exact same issue in my app. I couldn't find an offical way in the API to tell the difference, but here is a workaround.
Pass the current date in the userInfo when the local notification is created:
localNotification.userInfo = ["alertDate": NSDate()]
And when you handle didReceiveLocalNotification, check against current date again, to make sure it didn't just fire just a moment ago:
if application.applicationState == .Inactive {
if let alertDate = notification.userInfo?["alertDate"] as? NSDate
where (NSDate()).timeIntervalSinceDate(alertDate) > 0.1 {
// this means notification was initiated by user
}
}
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:1];
localNotification.alertBody = #"image inserted";
localNotification.timeZone = [NSTimeZone defaultTimeZone];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[self dismissViewControllerAnimated:YES completion:nil];
I have an app where I need to send a UILocationNotification when the app is not in the foreground / Active. If I have my code to do so, it will not send until the app is opened and is active.
Here is my function:
- (void)setLocalNotificationForType:(SPKLocalNotificationType)notificationType fromUser:(NSString *)userName withMessageText:(NSString *)msgText {
UILocalNotification *notif = [[UILocalNotification alloc] init];
notif.userInfo = #{#"handle": _convoHandle, #"room": _convoName};
notif.fireDate = [NSDate date];
notif.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
notif.soundName = UILocalNotificationDefaultSoundName;
notif.timeZone = [NSTimeZone defaultTimeZone];
if (notificationType == 1) { // message
notif.alertBody = [NSString stringWithFormat:#"#%# said: \"%#\"", userName, msgText];
} else if (notificationType == 2) { // image
notif.alertBody = [NSString stringWithFormat:#"#%# sent an image", userName];
} else {
return;
}
if ([[UIApplication sharedApplication] applicationState] != UIApplicationStateActive) {
[[UIApplication sharedApplication] presentLocalNotificationNow:notif];
}
}
Update:
It now seems that the problem is that the connection to the server is being "paused" while the app is in the background. Once I then open the app all the data comes in at once. I am using SocketRocket for connecting to my Node.js Primus web socket server. Is this something that normally happens? This is my first time using SocketRocket so I'm not sure.
Update:
I have also enabled Remote Notifications for Background Modes, I have also registered for remote notifications, and on the device, I have also made sure that "banners" and "badges" are enabled.
Update:
I have additionally set the web socket to use a background queue.
[webSocket setDelegateOperationQueue:[NSOperationQueue new]];
The connection is still being paused.
Thanks!
Edit: It looks like SocketRocket uses the main dispatch queue by default, which runs on the application's main thread. When the app is backgrounded, processing on the main thread stops, so it would be worth trying to move the work to a background thread in a background operation queue.
On your SRWebSocket object, try calling:
[webSocket setDelegateOperationQueue:[NSOperationQueue new]];
Without checking the docs, perhaps setting timeZone and fireDate on the UILocalNotification is interfering. You don't need those if you're going to pass the notification to presentLocalNotificationNow:.
I have also found that, even if you're using local notifications exclusively, you must:
Enable Remote notifications for your target on the Capabilities tab under Background Modes
Enable either alerts or banners in the Settings app, in Notification Center settings.
A sample event handler for a background fetch:
- (void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
UIBackgroundFetchResult result = UIBackgroundFetchResultNoData;
// ... perform a network request
if (successfulNetworkRequest) {
UILocalNotification* localNotification = [UILocalNotification new];
localNotification.alertAction = #"View";
localNotification.alertBody = #"Stuff";
localNotification.soundName = UILocalNotificationDefaultSoundName;
localNotification.applicationIconBadgeNumber = 1;
localNotification.userInfo = #{#"stuff": #"other stuff"};
[application presentLocalNotificationNow:localNotification];
result = UIBackgroundFetchResultNewData;
} else {
result = UIBackgroundFetchResultFailed;
}
completionHandler(result);
}
I am afraid you are misunderstanding of local notification. I guess what you should do is registering a notification in the future and send it some time after user clicked the home button. But in your code, you registered a alert in CURRENT TIME and did some thing on the notification (sorry but I don't know what you want to do in your code).
You could change it like this to make a sense:
- (void)setLocalNotificationForType:(SPKLocalNotificationType)notificationType fromUser:(NSString *)userName withMessageText:(NSString *)msgText {
UILocalNotification *notif = [[UILocalNotification alloc] init];
notif.userInfo = #{#"handle": _convoHandle, #"room": _convoName};
//Set the fire time 10 seconds later
notif.fireDate = [[NSDate date] dateByAddingTimeInterval:10];
notif.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
notif.soundName = UILocalNotificationDefaultSoundName;
notif.timeZone = [NSTimeZone defaultTimeZone];
if (notificationType == 1) { // message
notif.alertBody = [NSString stringWithFormat:#"#%# said: \"%#\"", userName, msgText];
} else if (notificationType == 2) { // image
notif.alertBody = [NSString stringWithFormat:#"#%# sent an image", userName];
} else {
return;
}
//Register this notification
[[UIApplication sharedApplication] scheduleLocalNotification:notification];
}
And in your app delegate's -applicationDidEnterBackground:, call your -setLocalNotificationForType:fromUser:withMessageText: method to make and register a notification. Then you can expect a local notification 10s after you click the home button.
I need to send a text message when the current time equals the time selected in the UIDatePicker. How might I do this? You don't need to include the code to send the message, I already have that coded. I've tried all sorts of things with NSTimer and if - then statements but none have worked.
Edit: Since I wrote this question I've found a better way to do things. I just need to set a local notification and when received execute my code with -(void)didRevieveLocalNotification. Here is what I have so that any googlers can hopefully be helped.
NSDate *pickerDate = [self.datePicker date];
//Set Local Notification
UILocalNotification *notif = [[UILocalNotification alloc] init];
notif.fireDate = pickerDate;
notif.timeZone = [NSTimeZone defaultTimeZone];
//----------------------------------------------------------------------
notif.alertBody = #"Tap to send your text message!";
notif.alertAction = #"send message...";
notif.soundName = #"sms_alert_nova.caf";
notif.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:notif];
well i would use a local notification... something like this
UILocalNotification *notification = [[UILocalNotification alloc] init];
notification.fireDate = theDate //The date that your picker has selected
notification.alertBody = #"Hey, the time just expired!"
notification.applicationIconBadgeNumber = 1;
[[UIApplication sharedApplication] scheduleLocalNotification:notif];
Then in your AppDelegate
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
//Code to manage the notification logic
}
Hope this helps, the user will get the alert even if on background.. if on background the user must click the alert to let your application know that the local notification triggered, if he does (or he is on your app already, then the app delegate method will trigger letting your app know that the notification fired...
Hope this helps!
I am trying to run some function every n-minutes when app is not running.
I thing local notification is suitable for that, but I have one problem.
If I set local notification as :
-(void)notification{
UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil)
return;
localNotif.fireDate = [[NSDate date] dateByAddingTimeInterval:15];
//localNotif.timeZone = [NSTimeZone defaultTimeZone];
// Notification details
localNotif.alertBody = #"marko";
// Set the action button
localNotif.alertAction = #"View";
localNotif.soundName = UILocalNotificationDefaultSoundName;
localNotif.applicationIconBadgeNumber = 1;
// Specify custom data for the notification
NSDictionary *infoDict = [NSDictionary dictionaryWithObject:#"someValue" forKey:#"someKey"];
localNotif.userInfo = infoDict;
// Schedule the notification
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
}
The notification is fired every time and then do:
- (void)application:(UIApplication *)app didReceiveLocalNotification:(UILocalNotification *)notif {
NSLog(#"Recieved Notification %#",notif);
}
What I would want is to after 15s first fire some function and if function return YES then play sound and put badge on it.
How to do that?
If the application is foremost and visible when the system delivers the notification, no alert is shown, no icon is badged, and no sound is played. However, the application:didReceiveLocalNotification: is called if the application delegate implements it.
Make sure you are testing in device.