如何在移动的 UIImage 到达特定点后执行操作
我正在尝试一款乒乓球游戏，以开始在 iPhone 上开发游戏，我已经完成了所有操作，但我需要实现得分并使球返回屏幕中心 这是我目前在 TouchesBegan 方法中的代码：
if(ball.center.y >=444) {
computerScore=computerScore+1;
computerScoreLabel=[NSString stringWithFormat:@"%d", computer];
ball.center.x=151;
ball.center.y=222;
}
if(ball.center.y <=4) {
playerScore=playerScore+1;
playerScoreLabel=[NSString stringWithFormat:@"%d", player];
ball.center.x=151;
ball.center.y=222;
}
它正确构建并运行，但是当我在模拟器上尝试游戏时，它只会使球移动，当它通过特定点时，它只会弹开，并且得分不会改变
i am trying out a pong game to start out developing games on the the iphone and i've got everything moving but i need to implement the scoring and make the ball return to the center of the screen
this is the code i have currently in the touchesBegan method:
if(ball.center.y >=444) {
computerScore=computerScore+1;
computerScoreLabel=[NSString stringWithFormat:@"%d", computer];
ball.center.x=151;
ball.center.y=222;
}
if(ball.center.y <=4) {
playerScore=playerScore+1;
playerScoreLabel=[NSString stringWithFormat:@"%d", player];
ball.center.x=151;
ball.center.y=222;
}
it builds correctly and runs, but when i try the game on the simulator it just makes the ball move around and when it passes the specific points it just bounces off and the score doesn't change
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我建议您添加一个 NSLog() 语句，以便您可以实际监视 ball.center.y 的值，并查看它是否在该值实际与您的条件匹配之前触发碰撞反弹。
I suggest you add an NSLog() statement so you can actually monitor the value of ball.center.y and see if it's, for instance, triggering a collision-bounce before the value actually matches your conditional.