Custom Segue to slide a view controller from the top

SegueSlideFromTop.m

-(void)perform{
    
    UIViewController *splashScreen = self.sourceViewController;
    UIViewController *mainScreen = self.destinationViewController;
    
    [splashScreen.view addSubview:mainScreen.view];
    
    mainScreen.view.center = CGPointMake(mainScreen.view.center.x, mainScreen.view.center.y-600);
    
    [UIView animateWithDuration:1
                     animations:^{
                         mainScreen.view.center = CGPointMake(mainScreen.view.center.x, [[UIScreen mainScreen] bounds].size.height/2);
                     }
                     completion:^(BOOL finished){
                         [splashScreen presentModalViewController:mainScreen animated:NO];
                         [[splashScreen.view.subviews lastObject] removeFromSuperview];
                     }
     ];
}