Updatoqueue和Cocos2d scheduleUpdate衝突

我正在使用CoreMotion收集加速計數據以更改精靈的位置。爲了做到這一點，你需要使用一個塊並更新到一個隊列。但是，這樣做與cocos2d scheduleUpdate衝突。這裏是核心self.motionManager代碼=Updatoqueue和Cocos2d scheduleUpdate衝突

[[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]; 
      }]; 

     }

，這是對我的日程表更新代碼：

/*************************************************************************/ 
//////////////////////////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; 
}

我知道我可以繞過使用scheduleUpdate，把更新代碼的內部第一塊，但我仍然希望能夠使用scheduleUpdates。我如何解決這個問題？

非常感謝您的幫助。

P.S.這是我的錯誤

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

來源

2012-12-11 AlexHeuman

問題是加速度計塊被調用每一幀，所以你不能在那裏安排更新。

只需在init中調度一次即可。然後使用BOOl iVar /屬性來跟蹤您的更新方法是否應該處理它正在執行的任何操作。

或者移動塊內的所有更新代碼。畢竟，加速計值更新每一幀，所以你不會錯過「更新」。

來源

2012-12-11 11:15:11 LearnCocos2D

謝謝，這總是顯而易見的，我想念。順便說一下，感謝您編寫您的書籍Learn Cocos2D，對於我通過對Cocoa環境和編程的全新掌握而感到欣喜。 – AlexHeuman

Updatoqueue和Cocos2d scheduleUpdate衝突

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