[英]How to detect UIImageView Collisions
我想知道為什么我的代碼不起作用。 我希望球(UIImageView)從一個塊(也是一個UIImageView)反彈。 我的球將x和y的運動都切換為負,而不是一個。 怎么了??? 請幫助...這是我的代碼
-(void)animateBall:(NSTimer *)theTimer {
collisionCount ++;
bouncyBall.center = CGPointMake(bouncyBall.center.x + ballMovement.x, bouncyBall.center.y + ballMovement.y);
if (CGRectIntersectsRect(bouncyBall.frame, wallOne.frame)) {
if (collisionCount >= 5) {
[self processCollision:wallOne];
collisionCount = 0;
}
}
if (bouncyBall.center.x > 313 || bouncyBall.center.x < 8) {
ballMovement.x = -ballMovement.x;
}
if (bouncyBall.center.y > 453 || bouncyBall.center.y < 8) {
ballMovement.y = -ballMovement.y;
}
}
-(void)processCollision:(UIImageView *)wall {
if (ballMovement.x > 0 && wall.frame.origin.x - bouncyBall.center.x <= 4) {
ballMovement.x = -ballMovement.x;
}
else if (ballMovement.x < 0 && bouncyBall.center.x - (wall.frame.origin.x + wall.frame.size.width) <= 4) {
ballMovement.x = -ballMovement.x;
}
if (ballMovement.y > 0 && wall.frame.origin.y - bouncyBall.center.y <= 4) {
ballMovement.y = -ballMovement.y;
}
else if (ballMovement.y < 0 && bouncyBall.center.y - (wall.frame.origin.y + wall.frame.size.height) <= 4) {
ballMovement.y = -ballMovement.y;
}
}
即使球擊中邊緣中心也會發生嗎? 無論如何,您是否只需要一次處理一個尺寸? 不是第三可if
是else if
?
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.