Cocos2d问题/问题

Question

我在Cocos2d上做游戏。我想让敌人在屏幕的右侧和左侧产生，并移动到屏幕上的随机点，然后重复。尽管我的努力，我无法弄清楚。这应该相对容易回答，它应该看起来像Ray Wenderlich的教程之一。一些代码会很好。谢谢！

Answer 1

这是从射线Wanderlich教程中的代码..

[self schedule:@selector(addTarget) interval:2.0]; 

-(void)addTarget { 

    CCSprite *target = [CCSprite spriteWithFile:@"Target.jpg" 
    rect:CGRectMake(0, 0, 27, 40)]; //Creating Sprite and setting rect 

    // Determine where to spawn the target along the Y axis 
    CGSize winSize = [[CCDirector sharedDirector] winSize]; //Get the screensize 
    int minY = target.contentSize.height/2; 
    int maxY = winSize.height - target.contentSize.height/2; 
    int rangeY = maxY - minY; 
    int actualY = (arc4random() % rangeY) + minY; 

    // Create the target slightly off-screen along the right edge, 
    // and along a random position along the Y axis as calculated above 
    target.position = ccp(winSize.width + (target.contentSize.width/2), actualY); 
    [self addChild:target]; 

    // Determine speed of the target 
    int minDuration = 2.0; 
    int maxDuration = 4.0; 
    int rangeDuration = maxDuration - minDuration; 
    int actualDuration = (arc4random() % rangeDuration) + minDuration; 

    // Create the actions 
    id actionMove = [CCMoveTo actionWithDuration:actualDuration 
    position:ccp(-target.contentSize.width/2, actualY)]; 
    id actionMoveDone = [CCCallFuncN actionWithTarget:self 
    selector:@selector(spriteMoveFinished:)]; 
    [target runAction:[CCSequence actions:actionMove, actionMoveDone, nil]]; 

} 

MINY - >在屏幕 MAXY --->在屏幕的顶部位置的底部位置。 rangeY --->屏幕的高度。 actualY --->计算屏幕底部和屏幕顶部之间的随机点。

target.position - >设置精灵移动的随机位置。

actualDuration - >获得随机的持续时间，使精灵在各种时间延迟中移动。

actionMove - >创建Move动作。 actionMoveDone --->完成移动动作后，调用spriteMoveFinished删除精灵。