Question

I have a small code to display image 1 and after 2 seconds replace image1 by image2 with animation below

UIImageView *view1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 410, 1020, 400)];
UIImage *image = [UIImage imageNamed:@"img.jpeg"];
view1.image = image;
[self.view addSubview:view1];
UIImageView *view2 = [[UIImageView alloc] init ];
view2.frame = CGRectMake(0, 410, 0, 400);
view2.image = [UIImage imageNamed:@"bien.jpeg"];
[self.view addSubview:view2];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.8];
[UIView setAnimationDelay:2];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(removeView: view1:)];
view2.frame =  CGRectMake(0, 410, 800, 400);
[UIView commitAnimations];

and function removeView to remove view1 from superview below:

-(void)removeView: (UIImageView *)view1{
[view1 removeFromSuperview];
 }

So i dont know why my function to remove view1 from superview not work, please help me! Thanks alot…

Answer 1

I would recommend you to use block based animations (available since iOS 4).
They are much easier to use and don’t need to send parameters through methods and all that stuff.
Example:

UIImageView *view1 = [[UIImageView alloc] init];
//initialize your UIImageView view1
[self.view addSubview:view1];
UIImageView *view2 = [[UIImageView alloc] init];
//initialize your UIImageView view2
[UIView animateWithDuration:2 animations:^{
    //here happens the animation
    [self addSubview:view2];
} completion:^(BOOL finished) {
    //here happens stuff when animation is complete
    [view1 removeFromSuperView];
}];

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