我显然不太了解 SKPhysicsJoint，但网上的信息还很少，当然除了 Apple 文档之外。下面的代码有什么问题，我认为它应该使头部和颈部永久连接在一起——我的意图是它们就像两张带别针的纸，这样它们就可以稍微旋转一下，而不是完全分开.当我运行这段代码时，它们掉到它们所在的 SKScene 的底部，撞到地面，然后头从 body 上掉下来。
也许关节没有随着它们移动或其他什么，它只是在它们移动时保持原位？？
self.head = [SKSpriteNode spriteNodeWithImageNamed:@"head.png"];
self.head.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.head.size];
self.head.physicsBody.mass = 0.05;
self.head.physicsBody.dynamic = YES;
self.chest = [SKSpriteNode spriteNodeWithImageNamed:@"chest_neck"];
self.chest.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.chest.size];
self.chest.physicsBody.mass = 0.05;
self.chest.physicsBody.dynamic = YES;
self.leftLeg = [SKSpriteNode spriteNodeWithImageNamed:@"left_leg"];
self.leftLeg.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.leftLeg.size];
self.leftLeg.physicsBody.mass = 10;
self.leftLeg.physicsBody.dynamic = YES;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
self.head.position = CGPointMake(282, 220);
self.chest.position = CGPointMake(282, 130);
self.leftLeg.position = CGPointMake(282, 10);
} else {
self.head.position = CGPointMake(512, 380);
self.chest.position = CGPointMake(512, 290);
self.leftLeg.position = CGPointMake(512, 10);
}
[self addChild:self.head];
[self addChild:self.chest];
[self addChild:self.leftLeg];
self.chestJointPinAnchor = CGPointMake(self.chest.position.x, self.chest.position.y+39);
self.chestJointPin = [SKPhysicsJointPin jointWithBodyA:self.head.physicsBody bodyB:self.chest.physicsBody anchor:self.chestJointPinAnchor];
[self.physicsWorld addJoint:self.chestJointPin];
最佳答案
这是因为您在设置 Sprite 的physicsBody 属性后设置 Sprite 的位置。 我没有在文档中发现任何提及，但上周末我试图弄清楚为什么我手动创建的绳索有效，但递归地却没有。 SpriteNodes 的位置必须在 physicsBody 之前设置。 因此，只需像这样重新排序您的代码:
self.head = [SKSpriteNode spriteNodeWithImageNamed:@"head.png"];
self.chest = [SKSpriteNode spriteNodeWithImageNamed:@"chest_neck"];
self.leftLeg = [SKSpriteNode spriteNodeWithImageNamed:@"left_leg"];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
self.head.position = CGPointMake(282, 220);
self.chest.position = CGPointMake(282, 130);
self.leftLeg.position = CGPointMake(282, 10);
} else {
self.head.position = CGPointMake(512, 380);
self.chest.position = CGPointMake(512, 290);
self.leftLeg.position = CGPointMake(512, 10);
self.head.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.head.size];
self.head.physicsBody.mass = 0.05;
self.head.physicsBody.dynamic = YES;
self.chest.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.chest.size];
self.chest.physicsBody.mass = 0.05;
self.chest.physicsBody.dynamic = YES;
self.leftLeg.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.leftLeg.size];
self.leftLeg.physicsBody.mass = 10;
self.leftLeg.physicsBody.dynamic = YES;
}
哦，我注意到了，你已经自己找到了答案......那你能不能把你的问题标记为已回答。
关于ios - 为什么这个 SKPhysicsJointPin 不能将这两个 Sprite 放在一起？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19666719/