Question

我遇到以下代码问题，它通过调用其大小来加载SKTexture。代码在调用大小的行中每100次运行中随机崩溃大约1次。还有一些其他SKTexture方法可以预加载图像，但它们也会更频繁地导致崩溃！我使用TextureAtlases并通过此方法防止所有SKTexure加载发生崩溃。

/* add image to dictionary thread-safe */
-(SKTexture*) getThreadSafeDictionaryContainImageOtherwiseLoadAndReturn:(NSString*) imageToLoad andForceLoad:(BOOL) forceLoad{

    // to control the enviroment where the image dictionary is modified, go ahead and lock it down with an NSLock
    [self.dictionaryModificationLock lock];

    SKTexture *toReturn = nil;
    CGSize size = CGSizeZero;

    // first, ignore duplicate loads by looking for the image in an NSDictionary called "allImages"
    if ((toReturn = [self.allImages objectForKey:imageToLoad])){
        // have the image to return already loaded

    }else{
        // grab the SKTexture and force it to load by requesting it's size
        SKTexture *texture = [SKTexture textureWithImageNamed:imageToLoad];
        if (forceLoad)
            size = texture.size; // crashes here!

        [self.allImages setObject:texture forKey:imageToLoad];
        toReturn = texture;
    }

    [self.dictionaryModificationLock unlock]; // unlock the NSLock
    return toReturn;
}

以下是崩溃报告的内容：

Fatal Exception: NSGenericException
*** Collection <NSConcreteMapTable: 0x1c059ff0> was mutated while being enumerated.

0   CoreFoundation  __exceptionPreprocess + 126
2   CoreFoundation  -[NSException name]
3   Foundation  -[NSConcreteMapTable countByEnumeratingWithState:objects:count:] + 56
4   CoreFoundation  -[__NSFastEnumerationEnumerator nextObject] + 110
5   SpriteKit   +[SKTextureAtlas(Internal) findTextureNamed:] + 284
6   SpriteKit   __26-[SKTexture loadImageData]_block_invoke + 1654
7   SpriteKit   SKSpinLockSync(int*, void () block_pointer) + 104
8   SpriteKit   -[SKTexture loadImageData] + 302
9   SpriteKit   -[SKTexture size] + 42

我发现其他一些帖子说这是SpriteKit的问题。但我认为必须有一些解决方法。你们觉得怎么样？

谢谢，

盖伦