objective-c – SpriteKit：如何创建基础物理接头

概述我试图在两个SK物理机构之间创建简单的关节.但是,他们是奇怪的. 我很清楚锚点应该在场景坐标上.请看附件源代码. 例如,这是在矩形上附加一个小方块之后如何得到固定的关节. -(void)createFixedJointOnScene:(SKScene*)scene { //Adding Rectangle SKSpriteNode* backBone = [[SKSpriteNode a 我试图在两个SK物理机构之间创建简单的关节.但是,他们是奇怪的.
我很清楚锚点应该在场景坐标上.请看附件源代码.

例如,这是在矩形上附加一个小方块之后如何得到固定的关节.

-(voID)createFixedJointOnScene:(SKScene*)scene

{

//Adding Rectangle    SKSpriteNode* backBone = [[SKSpriteNode alloc] initWithcolor:[UIcolor whitecolor] size:CGSizeMake(20,200)];backBone.position = CGPointMake(CGRectGetWIDth(self.frame)/2.0,CGRectGetHeight(self.frame)/2.0);backBone.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:backBone.size];backBone.physicsBody.categoryBitMask = GFPhysicscategoryRectangle;backBone.physicsBody.collisionBitMask = GFPhysicscategoryWorld;[scene addChild:backBone];//Adding SquareSKSpriteNode* head = [[SKSpriteNode alloc] initWithcolor:[SKcolor graycolor] size:CGSizeMake(40,40)];head.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:head.size];head.position = CGPointMake(backBone.position.x,backBone.position.y-40);head.physicsBody.categoryBitMask = GFPhysicscategorySquare;head.physicsBody.collisionBitMask = GFPhysicscategoryWorld;[scene addChild:head];//Pinning Rectangle and SquareNSLog(@"head position %@",NsstringFromCGPoint(head.position));SKPhysicsJointFixed* pin =[SKPhysicsJointFixed jointWithBodyA:backBone.physicsBody bodyB:head.physicsBody anchor:head.position];[self.physicsWorld addJoint:pin];

}

https://dl.dropboxusercontent.com/u/62559842/PhysicsTest.zip

谢谢.

解决方法 谢谢Smick ..经过比较Smick的代码与我,我发现这两行的顺序正在引起问题.

head.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:head.size];head.position = CGPointMake(backBone.position.x,backBone.position.y-40);

在设置Sprite物理身体之前,我设置了Sprite的位置,一切都开始正常工作.

head.position = CGPointMake(backBone.position.x,backBone.position.y-40);head.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:head.size];

现在我已经将Smick的代码附加到了完整的代码,并将链接附在这里.请享用.

https://dl.dropboxusercontent.com/u/62559842/PhysicsTest_Final_Working.zip

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