Question

我开始制作一个Ping Pong游戏的教程，我到达了球应该移动randmoly的部分但是在我的游戏中球只是上升或下降并且摇晃怪异。这是球运动的代码

-(IBAction)StartPoint:(id)sender
{

    Y = arc4random() %11;
    Y = Y - 5;

    X = arc4random() %11;
    X = X - 5;

    if (Y == 0) 
    {
        Y = 1;
    }

    if (X == 0) 
    {
        X = 1;
    }



    timer = [NSTimer scheduledTimerWithTimeInterval:0.01 
                                             target:self     
                                           selector:@selector(BallMovement) 
                                           userInfo:nil 
                                            repeats:YES];
}

-(void)BallMovement{
    ball.center = CGPointMake(ball.center.x + X, ball.center.y + Y);

    if (ball.center.x < 15) 
    {
        X = 0 - X;
    }

    if (ball.center.x < 305) 
    {
        X = 0 - X;
    }
}

Answer 1

好的，我修复了摇晃的问题，现在球在X中随机移动，但现在我需要让它与边界反弹。

-(IBAction)StartPoint:(id)sender{

Y = arc4random() %11;
Y = Y - 5;

X = arc4random() %9;
X = X - 5;

if (Y == 0) {
    Y = 1;
}

if (X == 0) {
    X = 1;
}



timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(BallMovement) userInfo:nil repeats:YES]; }

我删除了这部分的代码：

-(void)BallMovement 
{ 
ball.center = CGPointMake(ball.center.x + X, ball.center.y + Y);

//我删除了这部分的条件，球的运动得到了修复。

Answer 2

试一试。这是Bouncing Ball效果它不同的方向电影

-(void)onTimer 
{
ball.center = CGPointMake(ball.center.x+pos.x,ball.center.y+pos.y);

if(ball.center.x > 320 || ball.center.x < 0)

pos.x = -pos.x;

if(ball.center.y > 460 || ball.center.y < 0)

pos.y = -pos.y;

}


-(your method)

{

 pos = CGPointMake(14.0,7.0);

[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];

}

随机移动UIImage无法正常工作

2 个答案: