ios - 尝试从 GameLayer 访问类

Question

我有一个包含三个 Sprite 的自定义类“LinkWithNumber”在更新的 GameLayer 上，我正在尝试测试用于碰撞的 CGRectContainsRect 但是我在尝试访问类文件中的 Sprite 时遇到了问题(我没有太多经验所以很可能我搞砸了 :P)

我尝试了以下方法:

LinkWithNumber.h

@interface LinkWithNumber : SKSpriteNode <SKPhysicsContactDelegate>
{
SKSpriteNode *collide;
}

LinkWithNumber.m

@synthesize collide;

   //add collision object to the class
    collide = [[SKSpriteNode alloc]initWithColor:[SKColor blueColor]
                            ...blah blah as normal
   [self addChild:collide];
   collide.name = @"collide";

GameLayer.h

@class LinkWithNumber;
@interface GameScene : SKScene <SKPhysicsContactDelegate>
{
LinkWithNumber* twoSpritesWithParticlesBridge;
}
@property (nonatomic, strong)LinkWithNumber* twoSpritesWithParticlesBridge;

GameLayer.m

@synthesize twoSpritesWithParticlesBridge;

    -(void)addStaticLinkedSpriteWithParticles
{
    twoSpritesWithParticlesBridge =
    [[LinkWithNumber alloc]initWithlinkSpriteA:@"RoseMine06"
                                       spriteB:@"RoseMine06"
                             andPlistAnimation:@"need to create animations"
                                   distbetween:300
                                  hasParticles:YES
                                ParticlesNamed:@"Fire"];
      [self addChild:self->twoSpritesWithParticlesBridge];


    twoSpritesWithParticlesBridge.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize: twoSpritesWithParticlesBridge.frame.size];



}

-(void)update:(CFTimeInterval)currentTime {

LinkWithNumber *currentSprite = 
(LinkWithNumber*)[self  childNodeWithName:@"collide"];

 //NSLog(@"currentSprite Name @%@", currentSprite); //gets nil

if (CGRectContainsRect(myShip02.frame,currentSprite.frame)) {
NSLog(@"Hit barrier can pass");
        }
}

Any help would be appreciated :)

如何定位您的类对象...解决方案，感谢 0x141E!

 //name it on setup inside your customCLass 
 //eg yourObject.name = @"collide";

   //Now in Gamelayer locate your object by recursive search
   //it will look for any object named @"//collide"
   //without the slashes it will only look on the game layer
   //but since we need to dig a bit further we need them!

 LinkWithNumber *currentSprite =
(LinkWithNumber*)[self  childNodeWithName:@"//collide"];
NSLog(@"LinkWithNumber is %@",NSStringFromClass([currentSprite class]));


    //do something with your object
    if (currentSprite.position.y >0 ) {
        NSLog(@"currentSprite Position %f",currentSprite.position.y);
    }

额外内容

Sknode Class ref for other search functions

How to enumerate all nodes

Answer 1

我看到两个问题...

1. 您仅在根节点(在本例中为场景)中搜索名为“碰撞”的节点，但该节点是 LinkWithNumber 节点的子节点，而不是场景。要递归搜索整个节点树，使用@"//collide"
2. 您正在将搜索结果转换为 LinkWithNumber 指针，但是 collide 是一个 SKSpriteNode 而不是 LinkWithNumber.