Question

在此功能中，根据Xcode的仪器泄漏工具，我在两个位置发生内存泄漏。

我没有启用ARC并且无法激活它，所以我必须以另一种方式管理它。

+(NSArray *)changePolygonFrom:(NSArray *)polygon size:(float)size{

    int nmrOfPoints = [polygon count];
    double x[nmrOfPoints];
    double y[nmrOfPoints];
    for (int i = 0; i < nmrOfPoints; i++) {
        CGPoint p = [[polygon objectAtIndex:i] CGPointValue];
        x[i] = p.x;
        y[i] = p.y;
    }

    insetPolygon(x,y,nmrOfPoints,size);

    NSMutableArray *rPolygon = [[NSMutableArray alloc] initWithCapacity:nmrOfPoints];
    for(int i = 0; i < nmrOfPoints; i++){
        CGPoint p = CGPointMake(x[i], y[i]);
        NSValue *val = [NSValue valueWithCGPoint:p];
        [rPolygon addObject:val];
    }

    return rPolygon;
}

这就是我所说的

-(void)fixFuzArrays{
    if (fuzzFix) {
        largeFuzzPolygon = [Triangulation changePolygonFrom:normalPolygon size:(shortestDistance/2)];
        smallFuzzPolygon = [Triangulation changePolygonFrom:normalPolygon size:(shortestDistance/6)];
    }else{
        largeFuzzPolygon = [Triangulation changePolygonFrom:normalPolygon size:-(shortestDistance/2)];
        smallFuzzPolygon = [Triangulation changePolygonFrom:normalPolygon size:-(shortestDistance/6)];
    }
}

如果我在rPolygon上使用自动发布，我会在对象iFrame和oFrame上获得BAD_ACCESS，这是前一个函数的返回产品

-(void)drawAreaFuzzWithOuterFrame:(NSArray *)oFrame andInnerFrame:(NSArray *)iFrame withColor:(ccColor4B)c{
    for(int i = 0; i < [oFrame count]; i++){

        CGPoint oP1 = [[oFrame objectAtIndex:i] CGPointValue];
        CGPoint iP1 = [[iFrame objectAtIndex:i] CGPointValue];

        CGPoint oP2;
        CGPoint iP2;

        if(i == [oFrame count]-1){
            oP2 = [[oFrame objectAtIndex:0]   CGPointValue];
            iP2 = [[iFrame objectAtIndex:0]   CGPointValue];
        }else{
            oP2 = [[oFrame objectAtIndex:i+1]   CGPointValue];
            iP2 = [[iFrame objectAtIndex:i+1]   CGPointValue];
        }

        GLfloat vertices[] = {
            oP1.x,oP1.y,
            oP2.x,oP2.y,
            iP1.x,iP1.y,
            iP2.x,iP2.y,
        };

        GLubyte colors[] = {
            c.r,c.g,c.b,c.a,
            c.r,c.g,c.b,c.a,
            c.r,c.g,c.b,0,
            c.r,c.g,c.b,0,
        };

        BEdrawGLShapeWithVertices(vertices, colors);
    }
}

Answer 1

您必须在返回数组之前自动释放数组，然后将数组保留在接收它的方法中

将autorelease添加到NSMutableArray

NSMutableArray *rPolygon = [[[NSMutableArray alloc] initWithCapacity:nmrOfPoints] autorelease];

然后将retain保留在使用您的函数的方法上，但您必须稍后将其释放

NSArray *myArray = [[MyClass changePolygonFrom:array size:size] retain];

不要忘记稍后发布myArray

Answer 2

您必须将NSMutableArray标记为自动释放：

NSMutableArray *rPolygon = [[[NSMutableArray alloc] initWithCapacity:nmrOfPoints] autorelease];

如果你不这样做，你就是创建它，保留它，然后返回它。它从未发布过。

Answer 3

在声明 rPolygon 时忘了自动释放：

NSMutableArray *rPolygon = [[[NSMutableArray alloc] initWithCapacity:nmrOfPoints] autorelease];

修改您似乎没有保留+(NSArray *)changePolygonFrom:(NSArray *)polygon size:(float)size方法的结果。

尝试更改保留largeFuzzPolygon和smallFuzzPolygon的代码（请记得在dealloc方法中释放它们）：

-(void)fixFuzArrays{ [largeFuzzPolygon release]; [smallFuzzPolygon release]; if (fuzzFix) { largeFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:(shortestDistance/2)] retain]; smallFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:(shortestDistance/6)] retain]; }else{ largeFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:-(shortestDistance/2)] retain]; smallFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:-(shortestDistance/6)] retain]; } }

或更好我建议您合成它们并使用此代码：

-(void)fixFuzArrays{ if (fuzzFix) { self.largeFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:(shortestDistance/2)] retain]; self.smallFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:(shortestDistance/6)] retain]; }else{ self.largeFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:-(shortestDistance/2)] retain]; self.smallFuzzPolygon = [[Triangulation changePolygonFrom:normalPolygon size:-(shortestDistance/6)] retain]; } }

无法检测到内存泄漏的原因

3 个答案: