ios - SKNode 子类不移动子类

Question

如果没有配对 SKFieldNode，我的游戏中就没有 Sprite ，所以我的解决方案是创建 SKSpriteNode 的子类，并为 SKFieldNode 但它不起作用，因为 SKSpriteNode 表现得很奇怪(我不记得到底发生了什么)。所以我的下一个方法是将子类更改为 SKNode 然后我将 SKSpriteNode 和 SKFieldNode 作为这个新 的属性SKNode。但事实证明，touchesMoved 只会移动其中一个属性(以顶部为准)，结果始终是 SKSpriteNode。

解决这个问题的最佳方法是什么，我该如何解决它，以便我可以为每个 SKSpriteNode 拥有一个 SKFieldNode，同时仍然确保 Action 和方法仍然存在正常工作。

SKNode子类的当前代码:

@interface Whirlpool : SKNode
- (instancetype)initWithPosition:(CGPoint)pos region:(float)region strength:(float)strength falloff:(float)falloff;
@property (nonatomic, strong) SKFieldNode *gravityField;
@end

#import "Whirlpool.h"
#import "Categories.h"

@implementation Whirlpool
- (instancetype)initWithPosition:(CGPoint)pos region:(float)region strength:(float)strength falloff:(float)falloff {
    if (self = [super init]) {
        // whirlpool sprite
        SKSpriteNode *whirlpoolSprite = [[SKSpriteNode alloc] initWithImageNamed:@"whirlpool"];
        whirlpoolSprite.size = CGSizeMake(100, 100);
        whirlpoolSprite.position = pos;
        //removing physicsBody and associated attributes for now so that the boat does not collide with the whirlpool
        //whirlpoolSprite.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:whirlpoolSprite.size.width / 2];
        //whirlpoolSprite.physicsBody.dynamic = NO;
        whirlpoolSprite.zPosition = 1;
        whirlpoolSprite.name = @"whirlpool";
        [whirlpoolSprite runAction:[SKAction repeatActionForever:[self sharedRotateAction]]];

        // whirlpool gravity field
        _gravityField = [SKFieldNode radialGravityField];
        _gravityField.position = pos;
        _gravityField.strength = strength;
        _gravityField.falloff = falloff;
        _gravityField.region = [[SKRegion alloc] initWithRadius:region];
        _gravityField.physicsBody.categoryBitMask = gravityFieldCategory;
        _gravityField.zPosition = 1;

        [self addChild:whirlpoolSprite];
        [self addChild:_gravityField];
    }

    return self;
}

- (SKAction *)sharedRotateAction {
    static SKAction *rotateWhirlpool;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        rotateWhirlpool = [SKAction rotateByAngle:-M_PI * 2 duration:4.0];
    });

    return rotateWhirlpool;
}

@end

---

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    // we don't want the player to be able to move the whirlpools after the button is pressed
    if (_isRunning) {
        return;
    }

    for (UITouch *touch in touches) {
        CGPoint location = [touch locationInNode:self];
        SKNode *node = [self nodeAtPoint:location];
        // if the finger touches the boat or the whirlpool, update its location
        if ([node.name isEqualToString:@"boat"]) {
            node.position = CGPointMake(location.x, node.position.y);
        } else if ([node.name isEqualToString:@"whirlpool"]) {
            node.position = location;
        }
    }
}

Answer 1

我相信您的问题归结为“whirlpool”是您的 SKNode 子类的子类这一事实。因此，当您确定您确实在触摸“漩涡”时，您正在将它移动到其父类(SKNode 子类)中，而 SKFieldNode 和父类保持不变。对您的原始代码的这种小调整应该可以工作...如果我正确理解问题的话。

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    // we don't want the player to be able to move the whirlpools after the button is pressed
    if (_isRunning) {
        return;
    }

    for (UITouch *touch in touches) {
        CGPoint location = [touch locationInNode:self];
        SKNode *node = [self nodeAtPoint:location];
        // if the finger touches the boat or the whirlpool, update its location
        if ([node.name isEqualToString:@"boat"]) {
            node.position = CGPointMake(location.x, node.position.y);
        } else if ([node.name isEqualToString:@"whirlpool"]) {
            //move the SKNode subclass the whirlpool is a child of
            node.parent.position = location;
        }
    }
}

希望对您有所帮助。