如何在spriteKit上触摸图像/精灵？

Question

我想让一个精灵旋转一个手指触摸。老实说，我不知道该怎么做，spriteKit是新的。 任何想法？

Answer 1

这将使用动作将精灵旋转到触摸的位置。如果您希望在拖动手指时旋转它。您应该删除该操作并改为在touchesMoved:上执行计算。

-(void)didMoveToView:(SKView *)view { 
    sprite = [SKSpriteNode spriteNodeWithImageNamed:@"Spaceship"]; 

    sprite.xScale = 0.5; 
    sprite.yScale = 0.5; 
    sprite.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2); 

    [self addChild:sprite]; 
} 

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
    for (UITouch *touch in touches) { 
     CGPoint location = [touch locationInNode:self]; 


     float dY = sprite.position.y - location.y; 
     float dX = sprite.position.x - location.x; 
     float angle = atan2f(dY, dX) + 1.571f; 
     [sprite runAction:[SKAction rotateToAngle:angle duration:0.5 shortestUnitArc:YES]]; 
     return; 
    } 
} 

或者：？？？（请记住，从touchesBegan:

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ 
    for (UITouch *touch in touches) { 
     CGPoint location = [touch locationInNode:self]; 

     float dY = sprite.position.y - location.y; 
     float dX = sprite.position.x - location.x; 
     float angle = (atan2f(dY, dX)) + 1.571f; 
     sprite.zRotation = angle; 
    } 
}