ios - 移动父 SKNode 后，Sprite 套件找不到 nodeAtPoint

Question

你好。

我在 Sprite Kit 中遇到了这个奇怪的问题。我正在使用 nodeAtPoint和 categoryBitMask在调用跳跃方法时检测玩家是否接触地面。

一切正常。但是然后 - 为了在抽屉中显示一些可选按钮 - 当我用 SKAction moveTo:CGPoint 移动父节点时(我有地面和玩家作为 SKNode 的 child )，玩家不要跳。我 NSLog pointBelowPlayer , 它和以前一样，但是 blockNode.physicsBody一片空白!这可能是 Sprite Kit 中的错误，还是我遗漏了一些关于继承和位置的基本知识？

跳跃的方法:

-(void)playerJump {

    // Player jump if on ground
    CGPoint pointBelowPlayer = CGPointMake(_player.position.x, _player.position.y-_player.size.height);
    SKNode *blockNode = [self nodeAtPoint:pointBelowPlayer];

    if (blockNode.physicsBody.categoryBitMask == groundCategory){
        [_player.physicsBody applyImpulse:CGVectorMake(0, 120.0f)];
    }
}

移动父节点的方法:

-(void)toggleDrawer {
    if (bDrawerVisible) {
        [_actionLayer runAction:[SKAction moveTo:CGPointMake(0, 0) duration:1]];
        bDrawerVisible = false;
    } else {
        [_actionLayer runAction:[SKAction moveTo:CGPointMake(0, 200) duration:1]];
        bDrawerVisible = true;
    }
}

SpriteNodes 的创建:

-(id)initWithSize:(CGSize)size {
    if (self = [super initWithSize:size]) {

        _actionLayer = [SKNode new];

        _player = [self createPlayer];
        [_actionLayer addChild:_player];

        _ground = [self createGround];
        [_actionLayer addChild:_ground];
}

-(SKSpriteNode *)createPlayer {

    SKSpriteNode *player = [SKSpriteNode spriteNodeWithImageNamed:@"redSquare.png"];
    player.name = @"player";
    player.scale = 0.5;
    player.position = CGPointMake(screenWidth/3, player.size.height*2);
    player.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:player.size];
    player.physicsBody.categoryBitMask = playerCategory;
    player.physicsBody.collisionBitMask = groundCategory;
    player.physicsBody.contactTestBitMask = noteCategory;

    return player;
}

-(SKSpriteNode *)createGround {

    SKSpriteNode *ground = [SKSpriteNode spriteNodeWithImageNamed:@"ground.png"];
    ground.name = @"ground";
    ground.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:ground.size];
    ground.physicsBody.dynamic = NO;
    ground.physicsBody.categoryBitMask = groundCategory;
    ground.physicsBody.collisionBitMask = playerCategory;
    ground.xScale = screenWidth/ground.size.width;;
    ground.position = CGPointMake(self.size.width/2, 0);

    return ground;
}

Answer 1

好的，我解决了这个问题......如果你有一个以上的节点，在你点击的位置，如果最深的节点没有名字，或者最深的节点的名字，你将得到 null。

因此使用它来遍历所有找到的节点:

UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
NSArray *buttonNodes = [self nodesAtPoint:location];
for (SKNode *node in buttonNodes)
{
    NSLog(@"%@", node.name);
}

此外，您可以使用 NSLog(@"%f", node.zPosition); 获取 zPosition 以查看女巫一号在顶部。