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我正在使用 CoreMotion 收集加速度计数据以更改精灵的位置。为此，您需要使用块并更新到队列。但是，这样做会与 cocos2d scheduleUpdate 发生冲突。这是核心 self.motionManager = 的代码

[[CMMotionManager alloc] init];
        if (motionManager.isAccelerometerAvailable) {
            NSOperationQueue *queue = [[NSOperationQueue alloc] init];
            [self.motionManager
             startAccelerometerUpdatesToQueue:queue
             withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
                 // Deceleration
                 float deceleration = 0.4f;                         // Controls how fast velocity deceerates/low = quck to change dir
                 // sensitivity
                 float sensitivity=0.6f;
                 //how fast the velocity can be at most
                 float maxVelocity=100;

                 // adjust the velocity basedo n current accelerometer acceleration
                 playerVelocity.x = playerVelocity.x*deceleration+accelerometerData.acceleration.x*sensitivity;

                 // we must limit the maximum velocity of the players sprite, in both directions
                 if (playerVelocity.x>maxVelocity) {
                     playerVelocity.x=maxVelocity;
                 }else if (playerVelocity.x < -maxVelocity) {
                     playerVelocity.x = -maxVelocity;
                 }

                 // schedule the -(void)update:(ccTime)delta method to be called every frame

                 [self scheduleUpdateWithPriority:0];
             }];

        }

这是我的日程更新的代码：

/*************************************************************************/
//////////////////////////Listen for Accelerometer/////////////////////////
/*************************************************************************/
-(void) update:(ccTime)delta
{
    // Keep adding up the playerVelocity to the player's position
    CGPoint pos = player.position;
    pos.x += playerVelocity.x;

    // The player should also be stopped form going outside the screen
    CGSize screenSize = [CCDirector sharedDirector].winSize;
    float imageWidthHalved = player.texture.contentSize.width * 0.5f;
    float leftBorderLimit = imageWidthHalved;
    float rightBorderLimit = screenSize.width - imageWidthHalved;

    // preventing the player sprite from moving outside of the screen
    if (pos.x < leftBorderLimit) {
        pos.x=leftBorderLimit;
        playerVelocity=CGPointZero;
    } else if (pos.x>rightBorderLimit)
    {
        pos.x=rightBorderLimit;
        playerVelocity = CGPointZero;
    }

    // assigning the modified position back
    player.position = pos;
}

我知道我可以绕过 scheduleUpdate 并将更新代码放在第一个块中，但我仍然希望能够使用 scheduleUpdates。我该如何解决这个问题？

非常感谢您的帮助。

PS这是我的错误

    *** Terminating app due to uncaught exception
 'NSInternalInconsistencyException', reason: 
'CCScheduler: You can't re-schedule an 'update' selector'. 
Unschedule it first'
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1 回答 1

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问题是每帧都会调用加速度计模块，因此您无法在那里安排更新。

只需在 init 中安排一次更新。然后使用 BOOl iVar/property 来跟踪您的更新方法是否应该处理它正在执行的操作。

或者移动块内的所有更新代码。毕竟，加速度计值每帧都会更新，因此您实际上不会错过“更新”。

于 2012-12-11T11:15:11.510 回答