View transition is not animated during user pop segment

Question

View transition is not animated during user pop segment

I use custom segue to create extension animations when I push new view controllers into my navigation stack. If sourceRect is not specified during the call prepareForSegue:sender:, then the destination view controller expands from the center of the source view controller.

ExpandSegue.m:

- (id)initWithIdentifier:(NSString *)identifier source:(UIViewController *)source destination:(UIViewController *)destination {
    self = [super initWithIdentifier:identifier source:source destination:destination];

    self.sourceRect = CGRectMake(source.view.center.x, source.view.center.y, 0.0, 0.0);

    return self;
}

- (void)perform {
    UIViewController *sourceViewController = (UIViewController *)self.sourceViewController;
    UIViewController *destinationViewController = (UIViewController *)self.destinationViewController;

    CGRect destinationRect = sourceViewController.view.frame;
    CGFloat tx = self.sourceRect.origin.x + self.sourceRect.size.width/2 - destinationRect.origin.x - destinationRect.size.width/2;
    CGFloat ty = self.sourceRect.origin.y + self.sourceRect.size.height/2 - destinationRect.origin.y - destinationRect.size.height/2;
    CGFloat sx = self.sourceRect.size.width/destinationRect.size.width;
    CGFloat sy = self.sourceRect.size.height/destinationRect.size.height;

    [sourceViewController.view addSubview:destinationViewController.view];
    [destinationViewController.view setFrame:sourceViewController.view.frame];
    [destinationViewController.view setTransform:CGAffineTransformConcat(CGAffineTransformMakeScale(sx, sy), CGAffineTransformMakeTranslation(tx, ty))];

    [UIView animateWithDuration:0.5
                          delay:0.0
                        options:UIViewAnimationCurveEaseOut
                     animations:^{
                         [destinationViewController.view setTransform:CGAffineTransformIdentity];
                     } completion:^(BOOL finished) {
                         [destinationViewController.view removeFromSuperview];
                         [sourceViewController.navigationController pushViewController:destinationViewController animated:NO];
                     }];
}

The segue extension works as expected. I tried to create a segue collapse by undoing the logic from the segue extension, but that gave me problems. I want the source view controller to shrink to the size of destinationRect. If destinationRect is not specified, then I want the view to be compressed to the center of the view of the destination view manager.

CollapseSegue.m:

- (id)initWithIdentifier:(NSString *)identifier source:(UIViewController *)source destination:(UIViewController *)destination {
    self = [super initWithIdentifier:identifier source:source destination:destination];

    self.destinationRect = CGRectMake(source.view.center.x, source.view.center.y, 0.0, 0.0);

    return self;
}

- (void)perform {
    UIViewController *sourceViewController = (UIViewController *)self.sourceViewController;
    UIViewController *destinationViewController = (UIViewController *)self.destinationViewController;

    CGRect sourceRect = sourceViewController.view.frame;
    CGFloat tx = self.destinationRect.origin.x + self.destinationRect.size.width/2 - sourceRect.origin.x - sourceRect.size.width/2;
    CGFloat ty = self.destinationRect.origin.y + self.destinationRect.size.height/2 - sourceRect.origin.y - sourceRect.size.height/2;
    CGFloat sx = self.destinationRect.size.width/sourceRect.size.width;
    CGFloat sy = self.destinationRect.size.height/sourceRect.size.height;

    [sourceViewController.navigationController popViewControllerAnimated:NO];
    [destinationViewController.view addSubview:sourceViewController.view];
    [sourceViewController.view setFrame:destinationViewController.view.frame];

    [UIView animateWithDuration:0.5
                          delay:0.0
                        options:UIViewAnimationCurveEaseOut
                     animations:^{
                         [sourceViewController.view setTransform:CGAffineTransformConcat(CGAffineTransformMakeScale(sx, sy), CGAffineTransformMakeTranslation(tx, ty))];
                     } completion:^(BOOL finished) {
                         [sourceViewController.view removeFromSuperview];
                     }];
}