问具有多个xib或更多类的类？

EN

/* ARC code */

-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
    /* destroy the transition view, set the image first */
    UIImageView *transitionImageView = (UIImageView *)context;
    self.pic.image = transitionImageView.image;
    [transitionImageView removeFromSuperview];
    transitionImageView = nil;
}

- (void)clickHandler:(id)sender {
    /* temporary view for the animation */
    UIImageView *transitionImageView = [[UIImageView alloc] initWithFrame:self.pic.frame];
    transitionImageView.image = <# new UIImage #>;
    transitionImageView.alpha = 0.0f;
    [self.view addSubview:transitionImageView];

    [UIView beginAnimations:@"UpdateImages" context:transitionImageView];
    [UIView setAnimationDuration:2.0f];    
    transitionImageView.alpha = 1.0f;
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];    
    [UIView commitAnimations];
}