ios - objective c mkmapview overlay memory warning -


i developing ios park guide app displays mkmapview. show our own map have designed big size (2499x1504px) jpg overlay image. mkmapview displays view annotations.

i swiped around mapview , inspected memory size in debug navigator , recognized (sometimes, not always) memory grows 100-180 mb. if memory 150+mb memory warning , app crashes due memory problems. in simulator app never crashes.

to test purposes have removed overlays , annotations , swiped around again. in situations memory grows 100-120mb without memory warning.

my device: iphone 4s

the implementation:

if ([overlay iskindofclass:[lgsoverlay class]]) {         uiimage *theimage = [uiimage imagenamed:@"overlayimage"];         xyzoverlayrenderer *overlayrenderer = [[xyzoverlayrenderer alloc] initwithoverlay:overlay overlayimage:theimage];         return overlayrenderer; }

xyzoverlayrenderer:

-(id)initwithoverlay:(id<mkoverlay>)overlay overlayimage:(uiimage *)overlayimage {     self = [super initwithoverlay:overlay];     if (self) {         _overlayimage = overlayimage;     }     return self; }  - (void)drawmaprect:(mkmaprect)maprect zoomscale:(mkzoomscale)zoomscale incontext:(cgcontextref)context {     cgimageref imagereferenc = self.overlayimage.cgimage;          mkmaprect themaprect = self.overlay.boundingmaprect;     cgrect therect = [self rectformaprect:themaprect];      cgcontextscalectm(context, 1.0, -1.0);     cgcontexttranslatectm(context, 0.0, -therect.size.height);     cgcontextdrawimage(context, therect, imagereferenc); }

whats best solution solve problem?

edit:

i solved problem following tutorial: http://www.shawngrimes.me/2010/12/mapkit-overlays-session-1-overlay-map/

the simulator never runs out of memory, don't think strange. jpeg images of size way big once converted video buffer. iphone 4s has 512mb of ram shared between gpu , cpu. might have find way tile image or make smaller.

how know crash due memory problems? memory warnings , app terminated? maybe there issue.

you might using more native compressed powervr format rather using jpeg. outside of opengl es i'm not sure how they're supported.

note under ios 6+ mapkit uses vectors , takes 80-100 mb display map data.


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