如何在spriteKit上觸摸圖像/精靈？

Question

我想讓一個精靈旋轉一個手指觸摸。老實說，我不知道該怎麼做，spriteKit是新的。 任何想法？

Answer 1

這將使用動作將精靈旋轉到觸摸的位置。如果您希望在拖動手指時旋轉它。您應該刪除該操作並改爲在touchesMoved:上執行計算。

-(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：？？？（請記住，從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; 
    } 
}