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POReceived Memory Warning when MapView is loaded
 

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  1. POReceived Memory Warning when MapView is loaded
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    <p>I am working on a project in which I have a ViewController with <strong>MapView</strong> in it. </p> <p>Now this page is loaded and dismissed several times.</p> <p>What I first implemented was, I added MapView in xib and and then every time this page loaded then live bites used to increase by 10mb.</p> <p><strong>Solution1</strong></p> <p>Then after doing research for this issue what I found was to use single object for <strong>MKMapView</strong> and define it in <strong>AppDelegate</strong> and use it all the time.</p> <p>I tried this and it decreased the memory usage to some extent but again after sometime the app got crashed due to <strong>Received Memory Warning</strong>.</p> <p>Now if I again launch the app after crash, then it used to crash on the very first time on opening the MapView page, <strong>the live bites at this time were around 11mb only</strong>.</p> <blockquote> <p>This is the code to add mapview in AppDelegate</p> </blockquote> <pre><code> mapView=[[MKMapView alloc]initWithFrame:CGRectMake(0, 0, 300, 450)]; [self.window addSubview:mapView]; mapView.delegate=self; mapView.hidden=YES; </code></pre> <blockquote> <p>This was the code which I used to load Mapview.</p> </blockquote> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; latittude=[[[NSUserDefaults standardUserDefaults]valueForKey:@"LATITUDE"] floatValue]; longitude=[[[NSUserDefaults standardUserDefaults] valueForKey:@"LONGITUDE"] floatValue]; APPDELEGATE.mapView.frame=CGRectMake(0, 140, 320, 290); } -(void)viewDidAppear:(BOOL)animated { APPDELEGATE.mapView.hidden=NO; CLLocationCoordinate2D location; location.latitude = latittude; location.longitude = longitude; Annotation *a; a=[[Annotation alloc]initWithCoordinate:location]; [APPDELEGATE.mapView addAnnotation:a ]; } -(void)viewWillDisappear:(BOOL)animated { APPDELEGATE.mapView.hidden=YES; } </code></pre> <p><strong>Solution2</strong></p> <p>Second solution I found was to change MapView type when view disappears.</p> <p><strong>So I changed its type, changed its delegate to nil and removed from superview on ViewWillDisappear.</strong></p> <p>Even this didn't made any difference.</p> <p>Any idea how can I overcome this problem?</p> <p>Thanks</p>
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    1. COThe memoryWarning itself isn't a problem, it tells you that system has low memory. Can you show the viewDidLoad, viewWillAppear (and didAppear) and viewWillDisappear (and willDisappear)?
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      1. USMarco Pace
    2. CO@MarcoPace I have edit my question. Please look for all the methods mentioned by you.
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    3. COset mapview = nil in viewWillDisAppear
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      1. USkarthika
 

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