UIDynamicAnimator - 不能与UIView一起使用,但会使用Self.View吗？

Question

我使用Apple的示例应用程序中的代码并将其调整为我的.我想让UIImageView gameOverFalling运行这个方法(跌倒和反弹).它应该与UIView相冲突finalScoreView,正如你在第2行中看到的那样.

-(void)gameOverFallingMethod{
    UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:finalScoreView];

    UIGravityBehavior *gravityBeahvior = [[UIGravityBehavior alloc] initWithItems:@[self.gameOverFalling]];
    [animator addBehavior:gravityBeahvior];

    UICollisionBehavior *collisionBehavior = [[UICollisionBehavior alloc] initWithItems:@[self.gameOverFalling]];
    // Apple said: "Creates collision boundaries from the bounds of the dynamic animator's
    // reference view (self.view)."
    collisionBehavior.translatesReferenceBoundsIntoBoundary = YES;
    collisionBehavior.collisionDelegate = self;
    [animator addBehavior:collisionBehavior];

    self.animator = animator;
}

但是,当我运行我的应用程序时,它返回一个线程1:SIGABRT错误.在控制台中:

View item (<UIImageView: 0x10aaa0c70; frame = (15 175; 288 42);
  autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x10aa7e0a0>>)
should be a descendant of reference view in <UIDynamicAnimator: 0x10ae17610>
Stopped (0.000000s) in <UIView: 0x10aa9e1e0> {{0, 0}, {288, 195}}

当我用'self.view'替换第2行的'finalScoreView'时,它会工作,但它会落到整个屏幕的底部.

我做错了什么想法？我很想知道,谢谢!

Answer 1

从异常中看来,self.gameOverFalling它不会从finalScoreView视图层次结构中下降.请参阅UIDynamicAnimator类引用的引用:

要为视图设置动画,请使用initWithReferenceView:方法创建动画制作者.参考视图的坐标系用作动画师行为和项目的坐标系.与此类动画师关联的每个动态项必须是UIView对象,并且必须从参考视图下降.