iphone - CGRect 与多个 CGRect 的碰撞

Question

我是 iPhone 编程的新手，目前正在开发 ballsplit 游戏。在这个游戏中，当我的子弹击中任何球时，我希望它产生两个新球。我的子弹和球都是uiimageview。

这是我的代码:

if ((CGRectIntersectsRect(bullet.frame,Ball.frame)) && !(ball)){
    ball=TRUE;
    x=Ball.frame.origin.x;
    y=Ball.frame.origin.y;
    [self performSelector:@selector(createball)];
}

这是我的创建球函数..

-(void)createball{
    if (ball) {
        imageMove1 = [[UIImageView alloc] initWithFrame:CGRectMake(x,y,50 ,50)];  
        UIImage *imag = [UIImage imageNamed:@"ball1.png"];
        [imageMove1 setImage:imag];
        [self.view addSubview:imageMove1];
        [ballArray addObject:imageMove1];

        imageMove2 = [[UIImageView alloc] initWithFrame:CGRectMake(x,y,50 ,50)]; 
        UIImage *imag1 = [UIImage imageNamed:@"ball1.png"];
        [imageMove2 setImage:imag1];
        [self.view addSubview:imageMove2];
        [ballArray addObject:imageMove2];
        ball=FALSE;
        [self performSelector:@selector(moveball)];
    }
}

现在，在创建这两个 uiimgeview 之后，当子弹击中这两个 uiimageview 之一时，我希望它创建另外两个 uiimageview。但是我面临的问题是我们如何获得这些新的 uiimageview 的框架......

Answer 1

将子弹迭代移动到存储球图像引用的数组后:

for (UIImageView *ball in ballArray){
     //check for collision
    if (CGRectIntersectsRect(bullet.frame,ball.frame)){
        //hit
    }
}

检查球之间的碰撞:

for (UIImageView *ballOne in ballArray){
    for (UIImageView *ballTwo in ballArray){
        //check for collision
        if (CGRectIntersectsRect(ballOne.frame,ballTwo.frame) && ballOne != ballTwo){
            //hit
        }
    }
}