Can i use NSTimer in background? - xcode

Question

I use
NSString *urlStr=[NSString stringWithFormat: #"http://xxx.xxx.xxx.xxx:8080/fft/getautodisplaydelay"];
NSURL *url = [NSURL URLWithString:urlStr];
NSURLRequest *request = [[[NSURLRequest alloc] initWithURL:url cachePolicy : NSURLRequestReloadIgnoringCacheData timeoutInterval : 60.0 ] autorelease ];
NSHTTPURLResponse* urlResponse = nil;
NSError *error = [[NSError alloc] init];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"Delay is %#",result);
timer = [NSTimer scheduledTimerWithTimeInterval:(5)
target:self
selector:#selector(loginunlogin:)
userInfo:nil
repeats:YES];
UILocalNotification *localNotif =
[launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
}
-(void) loginunlogin:(NSTimer *)theTimer{
NSString *urlStr=[NSString stringWithFormat: #"http://xxx.xxx.xxx.xxx:8080/fft/getautodisplaydelay"];
NSURL *url = [NSURL URLWithString:urlStr];
NSURLRequest *request = [[[NSURLRequest alloc] initWithURL:url cachePolicy : NSURLRequestReloadIgnoringCacheData timeoutInterval : 60.0 ] autorelease ];
NSHTTPURLResponse* urlResponse = nil;
NSError *error = [[NSError alloc] init];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"Delay is %#",result);
delay=[result floatValue];
if([result isEqual:#"false"]==TRUE){
NSLog(#"Delay %#",result);
}else{
NSLog(#"User logged delay is %#",result);
[timer invalidate];
timer=nil;
delay=[result floatValue];
NSTimer *timer1 = [NSTimer scheduledTimerWithTimeInterval: delay target:self selector:#selector(targetMethod:)
userInfo:nil repeats:YES];
}
}
-(void) targetMethod: (NSTimer*)theTimer {
mapView =[[MKMapView alloc] init];
mapView.showsUserLocation=YES;
float mylo =mapView.userLocation.coordinate.longitude;
float myla =mapView.userLocation.coordinate.latitude;
NSString *str1 =[[NSString alloc] initWithFormat:#"%f",mylo];
NSString *str2 =[[NSString alloc] initWithFormat:#"%f",myla];
NSLog(#"longi %#",str1);
NSLog(#"latit %#",str2);
NSString *req=[NSString stringWithFormat: #"http://xxx.xxx.xxx.xxx:8080/fft/messages/getnewmessagescount?longitude=%#&latitude=%#",str1,str2];
NSURL *url = [NSURL URLWithString:req];
NSURLRequest *request = [[[NSURLRequest alloc] initWithURL:url cachePolicy : NSURLRequestReloadIgnoringCacheData timeoutInterval : 60.0 ] autorelease ];
NSHTTPURLResponse* urlResponse = nil;
NSError *error = [[NSError alloc] init];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"%#",request);
if ([result isEqual: #"0"])
{
NSLog(#"No messages");
}else{
if ([result isEqual:#"false"]) {
NSLog(#"Not logged");
}else{
NSString *path = [NSString stringWithFormat:#"%#%#",
[[NSBundle mainBundle] resourcePath],
#"/tada.wav"];
//declare a system sound id
SystemSoundID soundID;
//Get a URL for the sound file
NSURL *filePath = [NSURL fileURLWithPath:path isDirectory:NO];
//Use audio sevices to create the sound
AudioServicesCreateSystemSoundID((CFURLRef)filePath, &soundID);
//Use audio services to play the sound
AudioServicesPlaySystemSound(soundID);
NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
// Get the current date
NSDate *Date = [NSData date];
// Break the date up into components
NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit )
fromDate:Date];
NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit )
fromDate:Date];
// Set up the fire time
NSDateComponents *dateComps = [[NSDateComponents alloc] init];
[dateComps setDay:[dateComponents day]];
[dateComps setMonth:[dateComponents month]];
[dateComps setYear:[dateComponents year]];
[dateComps setHour:[timeComponents hour]];
// Notification will fire in one minute
[dateComps setMinute:[timeComponents minute]];
[dateComps setSecond:[timeComponents second]];
NSDate *itemDate = [calendar dateFromComponents:dateComps];
[dateComps release];
UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil)
return;
localNotif.fireDate = itemDate;
localNotif.timeZone = [NSTimeZone defaultTimeZone];
// Notification details
localNotif.alertBody = [[NSString alloc] initWithFormat:#"Your have got (%#) new messages",result];
// 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];
[localNotif release]; NSLog(#"bla %#",result);
}}
}
How to change code that it works in background

Answer 1

I am using this code to play the sound when my application enter into background you can customize it for your own use
- (void)applicationDidEnterBackground:(UIApplication *)application{
backgroundTask = [application beginBackgroundTaskWithExpirationHandler: ^{
dispatch_async(dispatch_get_main_queue(), ^{
if (backgroundTask != UIBackgroundTaskInvalid)
{
[application endBackgroundTask:backgroundTask];
backgroundTask = UIBackgroundTaskInvalid;
}
});
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[NSThread sleepForTimeInterval:3];
[self startPlayingInBackground:#"default.aif"];
NSLog(#"Time remaining: %f",[application backgroundTimeRemaining]);
dispatch_async(dispatch_get_main_queue(), ^{
if (backgroundTask != UIBackgroundTaskInvalid)
{
// if you don't call endBackgroundTask, the OS will exit your app.
[application endBackgroundTask:backgroundTask];
backgroundTask = UIBackgroundTaskInvalid;
}
});
});
}
The line below is the code with help of which m playing the sound it's my objective c function all
[self startPlayingInBackground:#"default.aif"];