Question

I am using the IPhone’s Accelerometer to make a object move. I want to be able to make this function work and not work depending on different states.

I have my code for my Accelerometer function and i want to put it into a BOOL so i can call on it when i need it, but i am having problems. Can anyone Help me put this code into a BOOL named:

-(BOOL) accelerometerWorks

-(void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
valueX = acceleration.x*25.5;


int newX = (int)(ball.center.x +valueX);
if (newX > 320-BALL_RADIUS)
    newX = 320-BALL_RADIUS;
if (newX < 0+BALL_RADIUS)
    newX = 0+BALL_RADIUS;


int XA = (int)(balloonbit1.center.x +valueX);
if (XA > 320-BALL_RADIUS)
    XA = 320-BALL_RADIUS;
if (XA < 0+BALL_RADIUS)
    XA = 0+BALL_RADIUS;

int XB = (int)(balloonbit2.center.x +valueX);
if (XB > 320-BALL_RADIUS)
    XB = 320-BALL_RADIUS;
if (XB < 0+BALL_RADIUS)
    XB = 0+BALL_RADIUS;

int XE = (int)(balloonbit5.center.x +valueX);
if (XE > 320-BALL_RADIUS)
    XE = 320-BALL_RADIUS;
if (XE < 0+BALL_RADIUS)
    XE = 0+BALL_RADIUS;

int XF = (int)(balloonbit6.center.x +valueX);
if (XF > 320-BALL_RADIUS)
    XF = 320-BALL_RADIUS;
if (XF < 0+BALL_RADIUS)
    XF = 0+BALL_RADIUS;


int XH = (int)(balloonbit8.center.x +valueX);
if (XH > 320-BALL_RADIUS)
    XH = 320-BALL_RADIUS;
if (XH < 0+BALL_RADIUS)
    XH = 0+BALL_RADIUS;



ball.center = CGPointMake (newX, 415);
balloonbit1.center = CGPointMake (XA, 408);
balloonbit2.center = CGPointMake (XB, 395);
balloonbit5.center = CGPointMake (XE, 388);
balloonbit6.center = CGPointMake (XF, 413);
balloonbit8.center = CGPointMake (XH, 426);
}

Please help. i have been trying for ages with no success. Thanks.
Harry.

Answer 1

Here’s my best guess about what you’re after, with nothing to verify it on.

If all you want to do is declare a BOOL value in your code, put

BOOL accelerometerWorks;

in your .h file.

Otherwise, if you want a function to check the state of the game as needed, do something like this:

-(BOOL) accelerometerWorks{
    //check conditions, return YES or NO...
    return time == 0;
}

and this:

-(void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration   *)acceleration{
    if(![self accelerometerWorks]) return;
    valueX = acceleration.x*25.5;


    int newX = (int)(ball.center.x +valueX);
    if (newX > 320-BALL_RADIUS)
        newX = 320-BALL_RADIUS;
    if (newX < 0+BALL_RADIUS)
        newX = 0+BALL_RADIUS;
    //etc.
}

You can’t mess around with the declaration of accelerometer:didAccelerate or you’ll just stop receiving the messages, but you CAN check for an invalid state inside of it.