iphone - 通过拖动屏幕在 Y 轴上移动 Sprite

Question

如何使精灵套件中的精灵在 y 轴上上下移动（iPhone 处于横向状态）。精灵必须保持在设定的 X 值上。这是在用户拖动它时完成的。

Answer 1

您需要实现touchesMoved

从接收器的先前位置减去当前位置，您将获得移动精灵的数量。

Objective-C

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
  UITouch *touch = [touches anyObject];
  CGPoint scenePosition = [touch locationInNode:self];
  CGPoint lastPosition = [touch previousLocationInNode:self];

  CGPoint translation = CGPointMake(0.0, scenePosition.y - lastPosition.y);
  yourSprite.position = CGPointMake(yourSprite.position.x, yourSprite.position.y + translation.y); 
}

斯威夫特 2.2

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
  for touch in touches {
    let scenePosition = touch.locationInNode(self)
    let lastPosition = touch.previousLocationInNode(self)

    let translation = CGPoint(x: 0.0, y: scenePosition.y - lastPosition.y)
    yourSprite.position = CGPointMake(yourSprite.position.x, yourSprite.position.y + translation.y);
  }
}

祝你好运！！

Answer 2

一个非常简单的绝对定位解决方案：

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint touchLocation;
    for (UITouch *touch in touches) {
        touchLocation = [touch locationInNode:self];
    }
    CGPoint spriteLocation = yourSprite.position; 
    spriteLocation.y = touchLocation.y;
    yourSprite.position = spriteLocation;
}

Answer 3

您可以使用 SKAction 类的这种方法：-

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *) event
{

   [mySprite runAction:[SKAction moveToY:400 duration:0.2];

}

这个 SKAction 方法创建一个垂直移动节点的动作。