objective c - Please help with iPhone Memory & Images, memory usage crashing app -

-

i have issue memory usage relating images , i've searched docs , watched videos cs193p , iphone dev site on memory mgmt , performance. i've searched online , posted on forums, still can't figure out.

the app uses core data , lets user associate text picture , stores list of items in table view lets add , delete items. clicking on row shows image , related text. that's it.

everything runs fine on simulator , on device well. ran analyzer , looked good, starting looking @ performance. ran leaks , looked good. issue when running object allocations every time select row , view image shown, live bytes jumps few mb , never goes down , app crashes due memory usage. sorting live bytes column, see 2 2.72mb mallocs (5.45mb total), 14 cfdatas (3.58mb total), 1 2.74mb malloc , else real small. problem related info in instruments technical , problem solving examples i've seen missing release , nothing complicated. instruments shows core data responsible library 1 (libsqlite3.dylib other) [nssqlcore _prepareresultsfromresultset:usingfetchplan:withmatchingrows:] caller 1 (fetchresultsetrealloccurrentrow other) , im not sure how track down problem is. i've looked @ stack traces , opened last instance of code , found 2 culprits (below). havent been able responses @ on this, if has tips or pointers, i'd appreciate it!!!!

    //this view controller shows title , image     - (void)viewwillappear:(bool)animated      {         [super viewwillappear:animated];     self.title = item.title;     self.itemtitletextfield.text = item.title;     if ([item.notes length] == 0)      {         self.itemnotestextview.hidden = yes;     } else      {         self.itemnotestextview.text = item.notes;     } //this line instruments points     uiimage *image = item.photo.image;     itemphoto.image = image; }  - (void)tableview:(uitableview *)tableview commiteditingstyle:(uitableviewcelleditingstyle)editingstyle forrowatindexpath:(nsindexpath *)indexpath  {     if (editingstyle == uitableviewcelleditingstyledelete)      {         // delete managed object given index path         nsmanagedobjectcontext *context = [fetchedresultscontroller managedobjectcontext];         [context deleteobject:[fetchedresultscontroller objectatindexpath:indexpath]];          // save context.         nserror *error = nil;         if (![context save:&error]) //this line instruments points         {              nslog(@"unresolved error %@, %@", error, [error userinfo]);             exit(-1);         }     }    }

i suggest store image url instead of image data itself. prevent coredata work , cache big data.


Comments

Post a Comment

Popular posts from this blog

javascript - Enclosure Memory Copies -

-
function myclass() { //lots , lots of vars , code here. this.bar = function() { //do numerous enclosed myclass vars } this.foo = function() { alert('hello'); //don't enclosed variables. } } each instance of myclass gets own copy of bar , foo, why prototyped methods use less memory. however, know more memory use of inner methods. it seems obvious me (1) below must true. agree? not distinct myclass instances have own distinct copies of bar, must have own distinct copies of myclass enclosure. (or else how bar method keep myclass variables straight on per instance basis?) now (2) question i'm after. since inner foo method doesn't use in myclass enclosure natural qustion is: javascript smart enough not keep myclass enclosure in memory use of foo? this depend entirely on implementation not language. naive implementations keep far more around others. answer true e.g. v8 (chrome's js engine) may not true spider...
Read more

php - Replacing tags in braces, even nested tags, with regex -

-
example preg_replace('/\{[a-za-z.,\(\)0-9]+\}/', 'replaced', 'lorem ipsum dolor sit {tag1({tag2()})}, consectetur adipiscing elit.'); the result: lorem ipsum dolor sit {tag1(replaced)}, consectetur adipiscing elit. question as can see "tag2" has been replaced, want replace "tag1" know how can this? (in cases might this: {tag1({tag2({tag3()})})}) , on.) btw using preg_replace_callback, easier show preg_replace here site can test code: http://www.spaweditor.com/scripts/regex/index.php you need add curly braces character set. here's pattern used: /\{[a-za-z.,\(\)\{\}0-9]+\}/ and here result: "lorem ipsum dolor sit replaced, consectetur adipiscing elit."
Read more