Animate alpha of an array of views step by step

gistfile1.m

/**
 *	The alpha is changed step by step in order of array
 *  @param duration the duration of the animations for each view
 */
- (void)animateAlphaForViews:(NSArray *)views to:(CGFloat)alpha duration:(CGFloat)duration
{

    if (views.count > 0) {
        UIView *view = views.firstObject;
        NSMutableArray *newViews = [views mutableCopy];
        [newViews removeObject:view];

        [UIView animateWithDuration:duration
            animations:^{
            // alpha blending
            [view setAlpha:alpha];
            }
            completion:^(BOOL finished) {
            [self animateAlphaForViews:newViews to:alpha duration:duration];
            }];
    }
}