小编djd*_*nce的帖子

我想将按钮移动到中心，显示它，然后移动到角落。

但它不会动，它立即出现在角落里。为什么？

更新Android 5.1，API 22。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                // remember true position/size
                final RelativeLayout.LayoutParams layoutParams_= (RelativeLayout.LayoutParams) mapFollowButton.getLayoutParams();
                // create temp position/size from which will move
                final RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams((int) (150*density), (int) (150*density));
                layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
                mapFollowButton.setLayoutParams(layoutParams);
                mapFollowButton.setVisibility(View.INVISIBLE);
                mapFollowButton.invalidate();

                final ChangeBounds transition= new ChangeBounds();
                transition.setDuration(1000L); 
                TransitionManager.beginDelayedTransition((ViewGroup) findViewById(R.id.mainRL),transition);
                //here expected to move to true position from center
                mapFollowButton.setLayoutParams(layoutParams_);
                mapFollowButton.setVisibility(View.VISIBLE);
} else
                mapFollowButton.setVisibility(View.VISIBLE);

如何禁止在SceneKit中旋转节点？

例如,我想要一个模型(锥形)是动态的,跳跃的和飞行的,但总是垂直定向的？

我在苹果的车辆演示中尝试修复它,这是一个糟糕的解决方案.我也尝试了下面的代码,但模型只是缓慢而且小故障掉了下来

?- (void)renderer:(id<SCNSceneRenderer>)aRenderer didSimulatePhysicsAtTime:(NSTimeInterval)time{
    _node.rotation = SCNVector4Make(0, 0, 0, 0);
    //[_node.physicsBody resetTransform]; // - tried this too
}

...最后我在scenekit手册中没有找到任何"allowRotation = NO".