Cocos2D學習筆記－使用Accelerometer

發生了個問題，在CCLayer的init中將isAccelerometerEnabled設成YES，並實作了底下的code

-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
    self.accelerationY = acceleration.y * 10;
    CCLOG(@"acceleration.y: %f",acceleration.y);
    CCLOG(@"accelerationY: %f",self.accelerationY);
}

-(void) update:(ccTime)deltaTime
{
    CCLOG(@"__accelerationY: %f",self.accelerationY);
    CGFloat x = __human.position.x;
    if (self.accelerationY != 0) {
        x += self.accelerationY;
    }
    __human.position = ccp( x , __human.position.y);
}


本以為可以正常的執行，卻發現__accelerationY的值一直是0，非常奇怪，找了下資料才發現要在OnEnter中再設定delegate

-(void) onEnter
{
    [super onEnter];
 
    if( self.isAccelerometerEnabled )
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
}


這樣就ok了

參考網址：
weird issue with accelerometer