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POUIImageView Allocating Memory Every Time Image Changed - How To Release?
 

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    <p>I'm trying to create an application that allows users to go through a set of images like a magazine. I've got one UIView class on top of the AppDelegate and on swipe to the left/right I'm either going forward or backward a page. My problem is that when I swipe and change the image source the program keeps allocating more memory, and I'm not certain where/how to release the previously allocated memory. I've looked in to the difference between imageNamed and imageWithContentsOfFile and I believe I'm using those correctly so I'm stumped. Any help would be much appreciated!</p> <p>AppDelegate.h</p> <p><pre><code>@interface AppDelegate : NSObject { UIWindow *window; MagazineWebViewController *webViewController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet MagazineWebViewController *webViewController; - (void)goToA:(NSNumber *)page; @end</pre></code></p> <p>AppDelegate.m</p> <p><pre><code>@implementation AppDelegate @synthesize window, webViewController; - (void)applicationDidFinishLaunching:(UIApplication *)application { webViewController = [[MagazineWebViewController alloc] init]; NSNumber *page = [NSNumber numberWithInt:1]; [webViewController setPage:page]; [window addSubview:webViewController.view]; [window makeKeyAndVisible]; } - (void)goToA:(NSNumber *)page { UIImage *image = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@", page] ofType:@"png"]]; webViewController.imageView.image = image; [image release]; [webViewController setPage:page]; } - (void)dealloc { [webViewController release]; webViewController = nil; [window release]; [super dealloc]; } @end</pre></code></p> <p>MagazineWebViewController.h</p> <p><code><pre>@interface MagazineWebViewController : UIViewController { UIImageView *imageView; NSNumber *page; } @property (nonatomic, assign)NSNumber *page; @property (nonatomic, retain)UIImageView *imageView; - (void)swipeLeft; - (void)swipeRight; - (void)tableOfContents; @end</pre></code></p> <p>MagazineWebViewController.m</p> <p><code><pre>@implementation MagazineWebViewController @synthesize page, tocController, imageView; - (id)init { UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 768, 60)]; navBar.tintColor = [UIColor blackColor];<br> UIBarButtonItem *contents = [[UIBarButtonItem alloc] initWithTitle:@"Table of Contents" style:UIBarButtonItemStylePlain target:self action:@selector(tableOfContents)]; UINavigationItem *item = [[UINavigationItem alloc] initWithTitle:@"Title"]; item.leftBarButtonItem = contents; item.hidesBackButton = YES; [navBar pushNavigationItem:item animated:NO]; [contents release]; [item release]; [self.view addSubview:navBar]; [navBar release];<br> self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 40, 768, 984)]; UIImage *image = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"1" ofType:@"png"]]; self.imageView.image = image; [image release]; self.imageView.contentMode = UIViewContentModeScaleToFill;<br> UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeft)]; swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft; [self.view addGestureRecognizer:swipeLeft]; [swipeLeft release];<br> UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRight)]; swipeRight.direction = UISwipeGestureRecognizerDirectionRight; [self.view addGestureRecognizer:swipeRight]; [swipeRight release];<br> [self.view addSubview:self.imageView];<br> [self.imageView release];<br> return self; } - (void)swipeLeft { int pageNum = [page intValue];<br> if (pageNum &lt; 115) { pageNum++; UIViewAnimationTransition trans = UIViewAnimationTransitionCurlUp; [UIView beginAnimations:nil context:nil]; [UIView setAnimationTransition:trans forView:self.view.window cache:YES]; BaseballMagazine2011AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; [appDelegate goToA:[NSNumber numberWithInt:pageNum]]; [UIView commitAnimations]; } } - (void)swipeRight { int pageNum = [page intValue];<br> if (pageNum > 1) { pageNum--;<br> UIViewAnimationTransition trans = UIViewAnimationTransitionCurlDown; [UIView beginAnimations:nil context:nil]; [UIView setAnimationTransition:trans forView:self.view.window cache:YES]; BaseballMagazine2011AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; [appDelegate goToA:[NSNumber numberWithInt:pageNum]]; [UIView commitAnimations]; } } - (void)tableOfContents { } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc. that aren't in use. } - (void)viewDidUnload { [imageView release]; imageView = nil; [page release]; page = nil; [tocController release]; tocController = nil; [super viewDidUnload]; } - (void)dealloc { [imageView release]; imageView = nil; [page release]; page = nil; [super dealloc]; } @end</pre></code></p>
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    1. COWhere do you invoke `[super init]`? This may be the reason why you're experiencing some issues...
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      1. USJacob Relkin
    2. COThere are no obvious leaks in your code and this memory is likely to be flushed as required by the system. In any case you could try setting the `image` property to nil in your `goToA:` method and see if it helps i.e. `if (webViewController.imageView.image) webViewController.imageView.image = nil;`. Also after you release `image` on the same method you can try and set it to nil as well.d
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      1. USRog
    3. COUnfortunately neither of those has fixed the problem. Instruments is telling me it's allocating Malloc and CFString a lot.
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