Question

我正试图制造一个小球,根据Pi的冰速计值进行滚动。

该法典不会建立:

-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
 if(difficulty == @"Easy")
 {
  CGFloat newX = (CGFloat)(ball.frame.origin.x + (CGFloat)acceleration.x);
  CGFloat newY = (CGFloat)(ball.frame.origin.y + (CGFloat)acceleration.y);
  ball.frame.origin.x = newX;
  ball.frame.origin.y = newY;
 }
}

这给我留下了任差错的左上演所需的价值。

我尝试了100件不同的东西,我每次都失败...... 这只是最近的失败。

任何人都没有任何见解?

Answer 1

你们必须整顿该中心:

-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
 if(difficulty == @"easy")
 {
  CFPoint center = ball.center;
  CGFloat center.x = (CGFloat)(ball.x + (CGFloat)acceleration.x);
  CGFloat center.y = (CGFloat)(ball.y + (CGFloat)acceleration.y);
  ball.center = center;
}
}

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