iphone - 如何在 Objective-C 或 cocos2d 中实现 powerUps 和其他游戏改变对象

Question

好的，所以我有这些能力，我想减慢/加快游戏中其他对象的移动几秒钟。

我有一个对象数组，其中有一个名为spawnInterval的变量，随着游戏的进行，它会变得越来越快，使得游戏在几分钟后变得更加困难。

但我无法真正掌握如何制作它，以便游戏中的角色会对不同的对象做出不同的 react ，就像当 fastPowerUp 被角色 Sprite 击中时，生成间隔不会改变。

反之亦然，使用slowPowerUp。

我目前拥有的代码是在更新方法中调用的移动序列方法中的代码:

-

(void) updateObstacles:(ccTime)delta{

    for (int i = 0; i < 20; i++) {
        //int randomizer = CCRANDOM_0_1() * [obstacles count];
        //NSLog(@"randomizer: %i",randomizer);
        CCSprite* randomObject = [obstacles randomObject];
        currentObject = [obstacles indexOfObject:randomObject];

            if ([randomObject numberOfRunningActions] == 0) {
                [self runObstacleMoveSequence:randomObject withTimer:delta];

                break;
        }
    }
}

-(void) runObstacleMoveSequence:(CCSprite *)object withTimer:(ccTime)delta{
    static int time;
    //Slowly increase object speed
    numObstaclesMoved++;
    if (!slowPowerUp && !fastPowerUp) {
        time += delta;
        if (numObstaclesMoved % 17 == 0 && obstacleMoveDuration > 2.0f) {
            obstacleMoveDuration -= 0.2f;
            if (spawnInterval > 0.1f) {
                [self unschedule:@selector(updateObstacles:)];
                [self schedule:@selector(updateObstacles:) interval:spawnInterval];
                spawnInterval-=0.1f;
                NSLog(@"interval: %f",spawnInterval);
            }
        }
    }else if (slowPowerUp && !fastPowerUp) {
        if (numObstaclesMoved % 17 == 0 && obstacleMoveDuration > 2.0f) {
            obstacleMoveDuration += 3.0f;
            if (spawnInterval > 0.1f) {
                [self unschedule:@selector(updateObstacles:)];
                [self schedule:@selector(updateObstacles:) interval:spawnInterval];
                spawnInterval-=0.1f;
                NSLog(@"interval: %f",spawnInterval);
                if (time >= (delta + 3)) {
                    slowPowerUp = NO;
                    obstacleMoveDuration -= 3.0f;
                }

            }
        }
    }else if (!slowPowerUp && fastPowerUp) {
        if (numObstaclesMoved % 17 == 0 && obstacleMoveDuration > 2.0f) {
            obstacleMoveDuration -= 3.0f;
            if (spawnInterval > 0.1f) {
                [self unschedule:@selector(updateObstacles:)];
                [self schedule:@selector(updateObstacles:) interval:spawnInterval];
                spawnInterval-=0.1f;
                NSLog(@"interval: %f",spawnInterval);
                if (time >= (delta + 3)) {
                    fastPowerUp = NO;
                    obstacleMoveDuration += 3.0f;
                }
            }
        }
    }
    CGSize screenSize = [[CCDirector sharedDirector]winSize];
    CGPoint aboveScreenPosition = CGPointMake(object.position.x, screenSize.height - object.position.y);

    int rotations = (CCRANDOM_0_1()*3) * 360;
    float duration = (CCRANDOM_0_1()*5.0f) + 8.0f;
    CCMoveTo* move = [CCMoveTo actionWithDuration:obstacleMoveDuration position:aboveScreenPosition];
    CCRotateTo* rotate = [CCRotateBy actionWithDuration:duration angle:rotations];
    CCSpawn* moveRotate = [CCSpawn actions: move, rotate, nil];
    CCCallFuncN* call = [CCCallFuncN actionWithTarget:self selector:@selector(objectAboveScreen:)];
    CCSequence* sequence = [CCSequence actions:moveRotate, call, nil];
    [object runAction:sequence];
    if (time >= (delta + 3)) {
        fastPowerUp = NO;
    }

}


-(void) objectAboveScreen:(id) sender{
    //make sure sender is actually of the right class
    NSAssert([sender isKindOfClass:[CCSprite class]], @"sender is not a CCSprite!");
    CCSprite* obstacle = (CCSprite*)sender;

    //move the back to the bottom of the screen
    CGPoint pos = obstacle.position;
    CGSize screenSize = [[CCDirector sharedDirector]winSize];
    pos.y = (-screenSize.height - [obstacle texture].contentSize.height);
    pos.x = CCRANDOM_0_1() * screenSize.width;
    obstacle.position = pos;
}

我真的不知道接下来该去哪里...我应该将 powerUps 设置为不同的类别吗？如果是这样，我将如何实现这样的事情？我真的很讨厌试图要求别人解决我的问题，但我真的无法绞尽脑汁解决这个问题，而且我很新......如果向我解释，那么我知道我将能够实现在我自己的 future 游戏中......

提前致谢，如果需要更多信息，请告诉我...

Answer 1

我会做类似的事情

在.h文件中

float speedModifier;
-(void)resetPowerUp;

在.m

-(void)resetPowerUp
{
    speedModifier = 1;
}

无论您在何处初始化关卡

[self resetPowerUp];

与加电发生碰撞时:

speedModifier = 2;
[self performSelector:@selector(resetPowerUp) withObject:nil afterDelay:5];

然后无论你移动到什么地方，无论它的速度应该受到加电模式的影响，将动画的速度(或除以它到达目的地所需的持续时间)乘以速度修改

希望有帮助