如何使用touch仅在y坐标中移动我的对象？

Question

我是Xcode的新手，想检查一下如何对它进行编码，以便我可以使用touch仅在y坐标中移动我的对象。

目前，我已经编程它遵循我的触摸，但它会遵循x和y坐标。

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { 
    /* Called when a touch begins */ 
    if moving.speed > 0 { 
     for touch: AnyObject in touches { 
      let location = touch.locationInNode(self) 


      bird.physicsBody?.velocity = CGVectorMake(0, 0) 
      bird.position = location 

     } 
    }else if canRestart { 
     self.resetScene() 
    } 
} 

我尝试过在网上搜索几个链接，但我似乎并没有很好地理解它。

Answer 1

如果你只是想从它的当前x位置沿y轴移动的“鸟”向上和向下，然后从该位置仅使用Y值：

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { 
    /* Called when a touch begins */ 
    if moving.speed > 0 { 
     for touch: AnyObject in touches { 
      let location = touch.locationInNode(self) 

      // Just duplicate our old position 
      var newPosition = bird.position 
      // and change only the y value, leaving the x value as whatever it was initially set to. X will never change 
      newPosition.y = location.y 

      bird.physicsBody?.velocity = CGVectorMake(0, 0) 
      bird.position = newPosition 

     } 
    }else if canRestart { 
     self.resetScene() 
    } 
} 

检查出的文档CGGeometry，特别是CGPoint。