Why is awakeFromNib not called when the view is visited again?

I would like to know if there is a method equivalent to awakeFromNib.

My app has 2 views and the 2nd view has a subclass (UIView) which I use to draw.

I use a timer which is called from awakeFromNib in order to animate the drawing.

- (void) awakeFromNib
{
    timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:selfselector:@selector(ReDraw) userInfo:nil repeats:YES];
}

- (void) ReDraw
{
    i++;
    [self setNeedsDisplay];
}

Now when i go back to my first view and come back to this view the drawing is still on (awakeFromNib is not called again).

The time开发者_如何学JAVAr doesn't stop when i go back to the first view. I want the timer to stop when i go back and the drawing to restart when i visit the second view again.

The methods viewdidLoad and initWithFrame: do not work inside the subclass.

awakeFromNib, viewdidLoad and initWithFrame are all called during the initialization phase of the object. If the object is already created, those methods will not be called again. You can force a view to draw itself by using the setNeedsDisplay method of the view.