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.

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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.