Question

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

- (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]];
}

并且它有点工作，但是如果我将重力设置得非常低，它似乎只能将精灵移动25％，然后如果我将重力设置为重力，那么它几乎不会在y轴上移动它默认。我很困惑，它可能是很多东西，但我想也许我只需要设置速度或其他东西，但如果是这样，那么什么是合适的设置？

Answer 1

这应该可以解决问题，我还建议你在抓住精灵时关闭物理，然后在释放时再次使用。

- (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)];
}

如果你想再次开启物理学

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

拖动通过SKPhysicsJoints附加的Sprite的最佳方法？

1 个答案: