内存问题/ overrelease with navigationcontroller和包含子CALayer的视图

Question

我在周末期间未能解决这个问题...我认为对Objective-C内存管理有很好的了解,但是这个很难解决.

总结一下上下文:我有一个吸引人的UIViewController,我在我的navigationcontroller中推送.这个UIViewController包含一个UIScrollView(在IB中创建).在UIViewController viewDidLoad()函数中,我添加了一个背景PDF(在UIview层的CATiledLayer子层中).

问题是,当我从导航控制器弹出UIViewController时,应用程序崩溃了.

使用Zombies工具和NSZombieLevel表明这是因为UIViewController被过度释放.

这是UIViewController:

@interface PlanViewController : UIViewController <UIScrollViewDelegate> {
    UIScrollView *panelScrollView;
    UIView *myContentView;
    CGPDFDocumentRef myDocumentRef;
    CGPDFPageRef myPageRef;
}

@property (nonatomic, retain) IBOutlet UIScrollView *panelScrollView;
@property (nonatomic, retain) UIView *myContentView;

@end

@implementation PlanViewController
@synthesize panelScrollView;
@synthesize myContentView;

- (void)viewDidLoad {
    [self setTitle:@"Plan"];

    myDocumentRef = CGPDFDocumentCreateWithURL((CFURLRef)[[NSBundle mainBundle] URLForResource:@"salonMap" withExtension:@"pdf"]);
    myPageRef = CGPDFDocumentGetPage(myDocumentRef, 1);
    CGRect pageRect = CGRectIntegral(CGPDFPageGetBoxRect(myPageRef, kCGPDFCropBox));

    CATiledLayer *tiledLayer = [[CATiledLayer alloc] init];
    [tiledLayer setDelegate:self];
    [tiledLayer setTileSize:CGSizeMake(1024.0, 1024.0)];
    [tiledLayer setLevelsOfDetail:4];
    [tiledLayer setLevelsOfDetailBias:8];
    [tiledLayer setFrame:pageRect];

    UIView *newView = [[UIView alloc] initWithFrame:pageRect];
    [newView.layer addSublayer:tiledLayer];
    [newView setTag:555];
    [self setMyContentView:newView];
    [newView release];
    [tiledLayer release];

    [panelScrollView setDelegate:self];
    [panelScrollView setContentSize:pageRect.size];
    [panelScrollView setMaximumZoomScale:5];
    [panelScrollView addSubview:myContentView];
    [panelScrollView setClipsToBounds: YES];
    [panelScrollView setMaximumZoomScale:20.0];
    [panelScrollView setMinimumZoomScale:1.0];
    [panelScrollView setZoomScale:1];

    [self initPinsOnMap];
}

- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
    CGContextSetRGBFillColor(ctx, 1.0, 1.0, 1.0, 1.0);
    CGContextFillRect(ctx, CGContextGetClipBoundingBox(ctx));
    CGContextTranslateCTM(ctx, 0.0, layer.bounds.size.height);
    CGContextScaleCTM(ctx, 1.0, -1.0);
    CGContextConcatCTM(ctx, CGPDFPageGetDrawingTransform(myPageRef, kCGPDFCropBox, layer.bounds, 0, true));
    CGContextDrawPDFPage(ctx, myPageRef);
}

- (void)dealloc {
    [panelScrollView release];
    [myContentView release];
    CGPDFDocumentRelease(myDocumentRef), myDocumentRef = NULL;
    myPageRef = NULL;
    [super dealloc];
}

@end

在几小时内玩了//之后,我发现只有当我发出"newView.layer addSublayer:tiledLayer];"时才会发生过度发布的问题.如果没有添加subLayer,则UIViewController不会过度释放.

我按下这样推动我的ViewController:

PlanViewController *trailsController = [[PlanViewController alloc] initWithNibName:@"PlanView" bundle:nil ];
[self.navigationController pushViewController:trailsController animated:YES];
[trailsController release];

我想知道我做错了什么.我一定会尊重内存管理指南.我认为问题来自CALayer.我在CALayer中尝试使用和不使用pdf,但它没有改变任何东西......

但无论我如何编码,它总是导致:** - [PlanViewController isKindOfClass:]:消息发送到解除分配的实例0xc641750**

乐器僵尸向我展示了过度发布:

88 PlanViewController Zombie -1 6909541120 0x64a6a00 0 UIKit - [UIView(Hierarchy)_makeSubtreePerformSelector:withObject:withObject:copySublayers:]

你有提示吗？

非常感谢你的帮助

Answer 1

解决了 !!!也许它可以帮助:

实际上,CATiledLayer会调用异步重绘.在发布UIViewController时,你必须对CATiledLayer说它的委托不再活着.我在我的CATiledLayer中添加了一个引用(assign),在我的dealloc函数中我做了:

self.PDFTiledLayer.contents=nil;
self.PDFTiledLayer.delegate=nil;
[self.PDFTiledLayer removeFromSuperlayer];

我希望你不会失去我失去的那么多时间......