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我无法移动通过 SKPhysicsJoint 附加的精灵。我有一个如下所示的 touchesMoved 方法：

- (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]];
}

它有点工作，但如果我将重力设置得非常低，它似乎只能将精灵移动 25%，如果我将重力设置为默认值，它几乎不会在 y 轴上移动。我很困惑，可能有很多东西，但我想也许我只需要设置速度或其他东西，但如果是这样，什么是合适的设置？

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1 回答 1

1

这应该可以解决问题，我还建议在您抓住精灵时关闭物理，并在您释放时再次打开。

- (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)];
}

如果你想再次打开物理

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    _selectedNode.physicsBody.dynamic = YES;
}
于 2013-10-30T22:31:28.713 回答