bodyWithBody SKPhysicsBody

Question

Apple 的文档在解释如何有效实现此类方法时含糊其辞

+ (SKPhysicsBody *)bodyWithBodies:(NSArray *)bodies; //the error that I'm getting is 2014-04-23 23:25:21.518 Space Monkey[3398:60b] -[SKSpriteNode _shapes]: unrecognized selector sent to instance 0x15d79c50

2014-04-23 23:25:21.520 Space Monkey[3398:60b] * 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[SKSpriteNode _shapes]：无法识别的选择器发送到实例 0x15d79c50” * 首先抛出调用栈： (0x2d92ef03 0x380c3ce7 0x2d932837 0x2d93112f... 它抛出了一个异常，我几乎到处都在研究，但没有运气。这里有关于同一问题的另一个问题，但是这些建议似乎根本不起作用。我已经提供了代码，以便有人阐明并希望指导我正确...这是代码

-(NSMutableArray *)platformBars
 {
   NSMutableArray *array =[[NSMutableArray alloc]init];
   //_spriteNode declared in the interface as an instance variable
   _spriteNode=[SKSpriteNode node];
   for (int i =0; i<5; i++)
      {
        _spriteNode= [SKSpriteNode spriteNodeWithImageNamed:@"Water Block"];
        _spriteNode.physicsBody.mass = 10.0f;
        _spriteNode.physicsBody.density = _spriteNode.size.height;
        _spriteNode.position = CGPointMake(x , _spriteNode.position.y);
        x=x+40;
        [array addObject:_spriteNode];
      }
      return array;
  }

-(PlatformNode *)createPlatformsAtPosition:(CGPoint)position
 {
   NSArray *arrays = [self platformBars];
   PlatformNode *node =[PlatformNode node];
   node.physicsBody = [SKPhysicsBody bodyWithBodies:arrays];
   for (SKSpriteNode *sknode in arrays)
       {
         [node addChild:sknode];
       }
   node.position=position;
   node.name    =@"platform";
   node.physicsBody.affectedByGravity  = NO;
   NSLog(@"bodyofSize %f",[node calculateAccumulatedFrame].size.width);
   return node;
  }

  -(PlatformNode *)createPlatformsAtPosition:(CGPoint)position is called in the  
  -(void)didMoveToView:(SKView *)view body of the function. 

我希望我包含了足够的详细信息和我的代码的 sn-p，因此希望有人会帮助我和其他人也来。先感谢您。

Answer 1

应该是

NSArray *arrays = [[self platformBars] copy];

而不是

NSArray *arrays = [self platformBars];

因为[self platformBars] 是可变数组，而arrays 是不可变的。
编辑
而且，数组中的顺便说一句是SKSpriteNodes，而不是物理实体。 所以

node.physicsBody = [SKPhysicsBody bodyWithBodies:arrays];

应该是

NSMutableArray *mArray=[NSMutableArray new];
for (SKSpriteNode *anySpriteNode in arrays){
[mArray addObject:anySpriteNode.physicsBody];
}
node.physicsBody = [SKPhysicsBody bodyWithBodies:mArray.copy];