How to perform the animation sequence with delay in ios - ios

Question

We have seven buttons, on clicking of anyone among them, i need to perform animations on remaining buttons "in sequence".
At present am using the following code in for loop,but animation is done on all the buttons at once.
[UIView beginAnimations: #"Fade In" context:nil];
button.alpha = 0;
[UIView setAnimationDelay:0];
[button setTitle:#"helloworld" forState:UIControlStateNormal];
[UIView setAnimationDuration:0];
button.alpha = 1;
[UIView commitAnimations];

Answer 1

You should not use beginAnimations:context: any more. To quote Apple's docs:
Use of this method is discouraged in iOS 4.0 and later. You should use
the block-based animation methods to specify your animations instead.
Use the new animateWithDuration family of methods instead. Specifically animateWithDuration:delay:options:animations:completion:. That method takes a delay parameter. You can issue a series of animation commands, each with a larger delay value. You can also chain animations by making the completion block of each animation trigger the next animation.
Edit: here is a link to a post where I show code that uses the completion method to trigger a sequence of animations one right after the other:
Scrolling the array of images using the CABasicAnimation

Answer 2

Try this thing in for loop
for(int btnIndex = 0; btnIndex < 7; btnIndex++) {
UIButton *button = [buttons objectAtIndex:0]; //get button reference from an array
[UIView beginAnimations: #"Fade In" context:nil];
button.alpha = 0;
[UIView setAnimationDelay:(0.1 * btnIndex)];
[button setTitle:#"helloworld" forState:UIControlStateNormal];
[UIView setAnimationDuration:0.1];
button.alpha = 1;
[UIView commitAnimations];
}