如何在移动物体碰到框架时停止移动物体？

Question

我正在做一个简单的游戏，用户可以将其中一个瓶子顶在状态栏上并打破它。我正在使用touchesMoved来测试用户是否抓住一个瓶子（UIView），并且会响应用户的手指轻弹方向而抛出它。对于投掷部分来说，它是有效的，但是我希望它被破坏，如果投掷出框架，它会变成破碎的瓶子，这部分会让人头疼。下面是部分代码：

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

UITouch *aTouch = [touches anyObject]; 
CGPoint location = [aTouch locationInView:self.view]; 

throwView = [self.view hitTest:location withEvent:nil]; 

//if the movement not on self.view, it's on the bottle. 
if (bottleView != self.view) { 
CGPoint loc = [aTouch locationInView:self.bottleView]; 
CGPoint prevloc = [aTouch previousLocationInView:self.bottleView]; 

//getting the finger moment 
myFrame = self.bottleView.frame; 
deltaX = loc.x - prevloc.x; 
deltaY = loc.y - prevloc.y; 

myLocation = bottleView.center; 


//Here I try to multiply the finger movement to throw the bottles 
[UIView beginAnimations:nil context:nil]; 
[UIView setAnimationDuration:.5]; 
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; 

myFrame.origin.x += deltaX*7.0; 
myFrame.origin.y += deltaY*7.0; 
[self.bottleView setFrame:myFrame]; 
[bottleView setNeedsDisplay]; 
[UIView commitAnimations]; 


//if it hits the top of the frame.. 
    if (myFrame.origin.y <=20){ 
     [self hitTheTop]; 
    } 
}} 


    //this part gives me headache, I repeat the code again otherwise the bottle is broken before hitting the top. 

-(void) hitTheTop{ 
[UIView beginAnimations:nil context:nil]; 
[UIView setAnimationDuration:.5]; 
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; 

myFrame.origin.x += deltaX*7.0; 
myFrame.origin.y += deltaY*7.0; 
[self.bottleView setFrame:myFrame]; 
[bottleView setNeedsDisplay]; 
[UIView commitAnimations]; 

//I calculate the slope and find where x should be when y is 0, 40 is half width of the bottle 
myFrame.origin.x = myLocation.x + (myLocation.y/(-deltaY/deltaX)) - 40; 
myFrame.origin.y = 0; 

UIImageView *bottleBroken= 
[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"broken.png"]]; 
[bottleBroken setFrame:CGRectMake(-20, -30, 130, 180)]; 
[self.bottleView setFrame:myFrame]; 
[bottleView addSubview:bottleBroken]; 
} 

现在，我所得到的是第一瓶飞出框架，很短的一段时间，似乎回到了框架的边缘，已经被打破，它真的看起来不自然。其实我正在考虑把它放在一个计时器来显示投掷，它可能会更好地管理。但我只是想探索是否有更简单的方法来做到这一点，没有计时器，thx任何建议！

Answer 1

下面是我在我的游戏中进行碰撞检测的方法。

NSMutableArray *collidees = [NSMutableArray arrayWithArray:[[GRSceneController sharedSceneController] sceneObjects]]; 

[collidees removeObject:self]; 

NSMutableArray *collisions = [[NSMutableArray alloc] init]; 

position.y += speed.y; 

for (GRBlock *obj in collidees) { 
    if ([self.collider doesCollideWithCollider:obj.collider]) 
     [collisions addObject:obj]; 
} 

if ([collisions count]) { 
    [(GRSceneObject<GRColliderDelegate> *)self didCollideWith:collisions collisionType:kVerticalCollision]; 
} 

[collisions removeAllObjects]; 

然后，我只是重复同样的事情position.x

的doesCollideWithCollider:方法看起来像这样

-(BOOL)doesCollideWithCollider:(GRColliderObject *)aCollider { 

    #if defined DEBUG_COLLIDER && defined LOG 
    logRect(hitBox); 
    logRect(aCollider.hitBox); 
    #endif 

    CGRect colliderBox = aCollider.hitBox; 

    return CGRectIntersectsRect(hitBox, colliderBox); 
} 

hitBox仅仅是围绕对象，并作为一个对撞机一个框，didCollideWith:collisionType:处理碰撞。

最重要的是，你应该有一个速度变量和position.y += speed.y创建某种速度。更新position.y和更新后的水平碰撞后检查垂直碰撞position.x