在Obj-c中获取对象的访问权限

Question

这是我的代码

-(NSMutableDictionary*)checkArrayForObject:(NSArray *)array withX:(int)mapX withY:(int)mapY withWith:(int)w withHeight:(int)h
{
    NSMutableDictionary *tempDictionary = [[NSMutableDictionary alloc] init];

    int cellWidth2 = w;
    int cellHeight2 = h;

    NSMutableArray *temp = [[NSMutableArray alloc ] initWithCapacity:(cellWidth2*cellHeight2)];

    //lets fill the array with something
    for (int iy=0; iy<cellWidth2; iy++) {
        for (int ix=0; ix<cellHeight2; ix++) {
            [temp addObject:[NSNull null]];
        }
    }


    Boolean overObjectYES = YES;
    Boolean overObjectNo = NO;

    [tempDictionary setObject:[NSNumber numberWithBool:overObjectNo] forKey:@"collision"];
    [tempDictionary setObject:temp forKey:@"regionArray"];

    NSLog(@"mapx, %d", mapX);
    NSLog(@"mapy, %d", mapY);
    NSLog(@"cell width, %d", cellWidth2);
    NSLog(@"cell height, %d", cellHeight2);


    int xx = 0;
    int yy = 0;

     NSLog(@"DO CHECK");

    for (int iy=mapY; iy<(mapY + cellHeight2); iy++) {

        xx = 0;

        for (int ix=mapX; ix<(mapX + cellWidth2); ix++) {

            //make index
            int ii = (iy*mapWidth)+ix;

             NSLog(@"array index, %d", ii);

            if([array objectAtIndex:ii] != [NSNull null])
            {

                NSLog(@"OVERLAPPING OBJECT");

                [tempDictionary setObject:[NSNumber numberWithBool:overObjectYES] forKey:@"collision"];

                //get object in real array
                NSMutableDictionary *obj = [array objectAtIndex:ii];

                //place in temp in same relative position

                //make index
                int ii2 = (yy*cellWidth2)+xx;

                if(ii2 < [temp count])
                {
                    [temp insertObject:obj atIndex:ii2];
                }
            }

            xx++;
        }

        yy++;
    }
    return tempDictionary;
}

在另一种方法中我调用此方法，但后来我试图访问已存储在数组中的对象，但我似乎无法访问它，或者上面的代码（insertObject： obj line）似乎没有插入任何东西。

这是我用来访问上面代码的代码......

 NSMutableDictionary *regionDictionary = [sharedInstance checkArrayForObject:sharedInstance.playerObjects  withX:sharedInstance.mapTileX withY:sharedInstance.mapTileY withWith:1 withHeight:1];

            Boolean overlap = [[regionDictionary objectForKey:@"collision"] boolValue];

            if(overlap == YES)
            {
               [self setupInfoMsg:[[regionDictionary objectForKey:@"region"]objectAtIndex:0]];
            }

当我单步执行该代码并进入setupInfoMSg时，参数= 0。

我是Obj-c的新手，所以这可能是一个简单的错误。