Question

我在触摸事件中收到了EXC BAD ACCESS错误。突出显示的行是：

if（[aCrate isKindOfClass：[Crate class]]）{

我正在使用cocos2d在启用ARC的项目中工作。我不知道为什么会发生这种错误，并且可以使用一些帮助调试。

-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if ([[AppData sharedData]isGamePaused] == NO) {
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];

    for (Crate* aCrate in self.children) {
        if ([aCrate isKindOfClass:[Crate class]]) {

            if ([self collisionWithPoint:location andRadius:40 andPoint:aCrate.crateSprite.position andRadius:aCrate.crateSprite.contentSize.width/2] && [aCrate isDestroyed] == NO) {
                CGPoint crateLocation = aCrate.crateSprite.position;
                [self crateTouched:crateLocation];

                ScoreNode* aScore = [ScoreNode createWithScore:[[objectDict objectForKey:@"CrateHit"]integerValue]];
                aScore.position = aCrate.crateSprite.position;
                [self addChild:aScore z:zScoreNode];

                [aCrate destroyed];

                score = score + 50;
            }

        }
    }
}

}

我使用此代码添加Crate对象，而不是在任何地方删除

Crate* aCrate = [Crate createWithDictionary:crateDict];
[self addChild:aCrate z:zCrate];

它让我发疯，所以任何帮助都会很棒

Answer 1

我猜你打电话时

[aCrate destroyed];

你是通过使用removeChild或removeFromParentWithCleanup从children数组中删除它，这是正确的吗？

如果是这样，这会修改children数组，这在枚举期间是非法的。您必须将待销毁的箱子添加到NSMutableArray并在方法的末尾执行：

NSMutableArray* toBeDestroyed = [NSMutableArray array];

for (Crate* aCrate in self.children) {
    if ([aCrate isKindOfClass:[Crate class]]) {
        ...
        if (needsToBeDestroyed) {
            [toBeDestroyed addObject:aCrate];
        }
    }
}

// now you can destroy them
[toBeDestroyed makeObjectsPerformSelector:@selector(destroyed)];

触摸事件上的EXC BAD ACCESS错误

1 个答案: