a Custom Segue that Simulates a Push Segue turns VC into Zombie

Question

[To Make things short and clear]

I\'ve written a custom segue.

-(void)perform {
UIView *preV = ((UIViewController *)self.sourceViewController).view;
UI         


        

Answer 1

You're getting a crash just because your new controller not retained after segue execution.

What you do is this:

• src and dest controllers are instantiated
• you perform your animations
• in completion you remove src view
• your src controller gets released, but window's rootViewController still pointing to it and your destination view controller not added to window's hierarchy.

This will work just as intended:

-(void)perform {
  UIView *preV = ((UIViewController *)self.sourceViewController).view;
  UIView *newV = ((UIViewController *)self.destinationViewController).view;

  UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
  newV.center = CGPointMake(preV.center.x + preV.frame.size.width, newV.center.y);
  [window insertSubview:newV aboveSubview:preV];

  [UIView animateWithDuration:0.4
                   animations:^{
                       newV.center = CGPointMake(preV.center.x, newV.center.y);
                       preV.center = CGPointMake(0- preV.center.x, newV.center.y);}
                   completion:^(BOOL finished){
                       [preV removeFromSuperview];
                       window.rootViewController = self.destinationViewController;
                   }];
}