拖動通過SKPhysicsJoints附加的Sprites的最佳方式？

Question

我無法移動通過SKPhysicsJoint附加的精靈。我有一個touchesMoved方法，看起來像這樣：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 
    UITouch *touch = [touches anyObject]; 
    CGPoint positionInScene = [touch locationInNode:self]; 
    CGPoint previousPosition = [touch previousLocationInNode:self]; 
    CGPoint translation = CGPointMake(positionInScene.x - previousPosition.x, positionInScene.y - previousPosition.y); 
    CGPoint newPosition = CGPointMake(_selectedNode.position.x + translation.x, _selectedNode.position.y + translation.y); 
    [_selectedNode runAction:[SKAction moveTo:newPosition duration:0]]; 
} 

和它種工作，但似乎可能是25％，只要它應該，如果我設定的重心非常低，只移動精靈，然後幾乎如果我將重力設置爲默認值，則會在y軸上移動它。我很困惑，可能有很多事情，但我想也許我只需要設置速度或其他東西，但如果是這樣，那麼什麼是合適的設置？

Answer 1

這應該解決問題，我也建議關閉物理，當你抓住精靈，並釋放時再次turing。

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

    UITouch *touch = [touches anyObject]; 
    CGPoint positionInScene = [touch locationInNode:self]; 
    CGPoint previousPosition = [touch previousLocationInNode:self]; 
    CGPoint translation = CGPointMake(positionInScene.x - previousPosition.x, positionInScene.y - previousPosition.y); 
    //_selectedNode.physicsBody.dynamic = NO; 
    [_selectedNode setPosition:CGPointMake(_selectedNode.position.x + translation.x, _selectedNode.position.y + translation.y)]; 
} 

，如果你想打開物理上再次

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    _selectedNode.physicsBody.dynamic = YES; 
}