How I can solve Terminated due to Memory Error

Question

I am using MKMapView in my big project . when I load a lot annotation (over 700) and I draw line between those points on MapKit , I am getting xcode error message "Terminated due to memory error" and app is crashing . you can see on image:

.

I am adding line like this :

if I have less than 700 annotation , it's working very well . I am thinking it's have some memory problem . How can I solve this problem ?any advice .

    // adding annodation 
    for (int i=0; i<[fetcher.locations count]; i++)//fetcher.locations is NSMutableArray and inside have  locationInfoClass objects .  locationInfoClass is hold CLLocationCoordinate2D.
        {
           locationInfoClass * loc=[fetcher2.locations objectAtIndex:i];

            CLLocationCoordinate2D coordinate1;
            coordinate1.latitude = loc.lat;
            coordinate1.longitude = loc.lon;

            myAnnotation * ann = [[myAnnotation alloc] initWithCoordinate:annCoordinate           title:@"uniqtitle" subtitle:@"uniqsubtitle"];
           [mapView addAnnotation:ann];


        }
        #pragma mark -
        #pragma mark -mapview overlay 


        CLLocationCoordinate2D *coordinates
        = malloc(sizeof(CLLocationCoordinate2D) * [mapView.annotations count]);

        for (int i=0; i<[mapView.annotations count]; i++) {
            myAnnotation * ann=[mapView.annotations objectAtIndex:i];
            coordinates[i]=ann.coordinate;


        }


        self.routeLine = [MKPolyline polylineWithCoordinates:coordinates count:mapView.annotations.count]; // pinlerin sayısı ne kadarsa o kadar çizgi çiziyor.
        free(coordinates);
        [self.mapView setVisibleMapRect:[self.routeLine boundingMapRect]]; //If you want the route to be visible
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.mapView addOverlay:self.routeLine];
        });

.h file have

@property (nonatomic, retain) MKPolyline *routeLine; //your line
@property (nonatomic, retain) MKPolylineView *routeLineView; //overlay view 

MKMapView Delegate Methods .

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay
{
    if(overlay == self.routeLine)
    {
        if(nil == self.routeLineView)
        {
            self.routeLineView = [[MKPolylineView alloc] initWithPolyline:self.routeLine];
            self.routeLineView.fillColor = [UIColor redColor];
            self.routeLineView.strokeColor = [UIColor redColor];
            self.routeLineView.lineWidth = 3;

        }

        return self.routeLineView;
    }

    return nil;
}
/*
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
    MKAnnotationView *annotationView = [views objectAtIndex:0];
    id <MKAnnotation> mp = [annotationView annotation];
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 1500, 1500);
    [mv setRegion:region animated:YES];

}*/
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{

    MKAnnotationView *pinView = nil;
    if(annotation != mapView.userLocation)
    {
        static NSString *defaultPinID = @"ftffggf";
        pinView = (MKAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinView == nil )
            pinView = [[MKAnnotationView alloc]
                       initWithAnnotation:annotation reuseIdentifier:defaultPinID];

        //pinView.pinColor = MKPinAnnotationColorGreen;
        pinView.canShowCallout = YES;



        //pinView.animatesDrop = YES;
        UIImage * image=[UIImage imageNamed:@"pin.png"];
        CGSize size=CGSizeMake(50, 63);//set the width and height
        pinView.image = image
    }
    else {
        [self.mapView.userLocation setTitle:@"I am here"];
    }
    pinView.centerOffset = CGPointMake(0,-23);
    return pinView;

}

Answer 1

Recently — and with increasing frequency — I have been seeing the same error message ("Terminated due to Memory Error") every time I ran a project from XCode, after almost exactly one minute of runtime, even if I don't touch the app after it started.

I was not seeing:

• Any surprising memory consumption when run with the profiler.
• Any obvious patterns in when the app is terminated (other than the length of time it took to occur, but that took a while to recognise).
• Any "Terminating app due to uncaught exception" error messages, or stack traces in the console.
• Any exceptions being thrown (exception breakpoint; exception: all; break: on throw).
• Any zombie objects.

Also, I have only seen the app exist unexpectedly when the app is being run in debug — no randomly jumping back to Springboard if I re-ran the app from the device straight after it was terminated.

I was about to ask a similar question, detailing all these specifics and asking how on earth I could solve the problem.

Then I had a d'oh moment, and noticed two memory warnings in the console, even though the profiler didn't show any memory issues.

Zombies. When I turned off Zombie Objects, the memory warnings disappeared, and the app no longer spontaneously terminated.

Edit:

10 months later, I found another situation where this can happen. Turned out, an infinite while loop can also do this:

while (result==nil) {
    result = [collectionView indexPathForItemAtPoint:testPoint];
    testPoint = nextTestPoint(); // After about 12 seconds, at which point this is several tens of thousands of pixels off the edge of the screen, the app dies from "Memory error"
}